16 Del. Admin. Code § 4462-4.0
* Loss of pressure
* Well pump failure
* Main break with associated loss of pressure
* Loss of disinfectant or other treatment failure
* Acts of vandalism
* Discovery of malicious intent
We are required to monitor the source of your drinking water for Cryptosporidium. Results of the monitoring are to be used to determine whether water treatment at the (treatment plant name) is sufficient to adequately remove Cryptosporidium from your drinking water. We are required to complete this monitoring and make this determination by (required bin determination date). We "did not monitor or test" or "did not complete all monitoring or testing" on schedule and, therefore, we may not be able to determine by the required date what treatment modifications, if any, must be made to ensure adequate Cryptosporidium removal. Missing this deadline may, in turn, jeopardize our ability to have the required treatment modifications, if any, completed by the deadline required, (date).
For more information, please call (name of water system contact) of (name of water system) at (phone number).
We are required to monitor the source of your drinking water for Cryptosporidium in order to determine by (date) whether water treatment at the (treatment plant name) is sufficient to adequately remove Cryptosporidium from your drinking water. We have not made this determination by the required date. Our failure to do this may jeopardize our ability to have the required treatment modifications, if any, completed by the required deadline of (date). For more information, please call (name of water system contact) of (name of water system) at (phone number).
"We are required to monitor your drinking water for specific contaminants on a regular basis. Results of regular monitoring are an indicator of whether or not your drinking water meets health standards. During [compliance period], we "did not monitor or test" or "did not complete all monitoring or testing" for [contaminant(s)], and therefore cannot be sure of the quality of your drinking water during that time."
"Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail."
Inadequately treated or inadequately protected water may contain disease-causing organisms. These organisms can cause symptoms such as diarrhea, nausea, cramps, and associated headaches.
Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially-harmful, bacteria may be present or that a potential pathway exists through which contaminants may enter the drinking water distribution system. We found coliforms indicating the need to look for potential problems in water treatment or distribution. When this occurs we are required to conduct assessments to identify problems and to correct any problems that are found.
[THE SYSTEM MUST USE THE FOLLOWING APPLICABLE SENTENCES]
We failed to conduct the required assessment.
We failed to correct all identified sanitary defects that were found during the assessment(s).
E. coli are bacteria whose presence indicates that the water may be contaminated with human or animal wastes. Microbes in these wastes can cause short-term effects, such as diarrhea, cramps, nausea, headaches, or other symptoms. They may pose a special health risk for infants, young children, the elderly and people with severely compromised immune systems. We violated the standard for E.coli, indicating the need to look for potential problems in water treatment or distribution. When this occurs we are required to conduct a detailed assessment to identify problems and to correct any problems that are found.
[THE SYSTEM MUST USE THE FOLLOWING APPLICABLE SENTENCES]
We failed to conduct the required assessment.
We failed to correct all identified sanitary defects that were found during the assessment that we conducted,
Total organic carbon (TOC): Total organic carbon (TOC) has no health effects. However, total organic carbon provides a medium for the formation of disinfection byproducts. These byproducts include trihalomethanes (THMs) and haloacetic acids (HAAs). Drinking water containing these byproducts in excess of the MCL may lead to adverse health effects, liver or kidney problems, or nervous system effects, and may lead to an increased risk of getting cancer.
Turbidity: Turbidity has no health effects. However, turbidity can interfere with disinfection and provide a medium for microbial growth. Turbidity may indicate the presence of disease-causing organisms. These organisms include bacteria, viruses, and parasites that can cause symptoms such as nausea, cramps, diarrhea, and associated headaches.
Giardia Iamblia, viruses, Heterotrophic plate count (HPC) bacteria, Legionella, and Cryptosporidium: Inadequately treated water may contain disease-causing organisms. These organisms include bacteria, viruses, and parasites which can cause symptoms such as nausea, cramps, diarrhea, and associated headaches. The language in this paragraph shall be used for any violation of the following rules: the Surface Water Treatment Rule; The Interim Enhanced Surface Water Treatment Rule; The Filter Backwash Recycling Rule; and, the Long Term 1 Enhanced Surface Water Treatment Rule.
* Antimony: Some people who drink water containing antimony well in excess of the MCL over many years could experience increases in blood cholesterol and decreases in blood sugar.
* Arsenic: Some people who drink water containing arsenic in excess of the MCL over many years could experience skin damage or problems with their circulatory system, and may have an increased risk of getting cancer. * Asbestos: Some people who drink water containing asbestos in excess of the MCL over many years may have an increased risk of developing benign intestinal polyps.
* Barium: Some people who drink water containing barium in excess of the MCL over many years could experience an increase in their blood pressure.
* Beryllium: Some people who drink water containing beryllium well in excess of the MCL over many years could develop intestinal lesions.
* Cadmium: Some people who drink water containing cadmium in excess of the MCL over many years could experience kidney damage. * Chromium: Some people who use water containing chromium well in excess of the MCL over many years could experience allergic dermatitis.
* Copper: Copper is an essential nutrient, but some people who drink water containing copper in excess of the action level over a relatively short amount of time could experience gastrointestinal distress. Some people who drink water containing copper in excess of the action level over many years could suffer liver or kidney damage. People with Wilson's Disease should consult their personal doctor.
* Cyanide: Some people who drink water containing cyanide well in excess of the MCL over many years could experience nerve damage or problems with their thyroid.
* Lead: Infants and children who drink water containing lead in excess of the action level could experience delays in their physical or mental development. Children could show slight deficits in attention span and learning abilities. Adults who drink this water over many years could develop kidney problems or high blood pressure.
* Mercury (inorganic): Some people who drink water containing inorganic mercury well in excess of the MCL over many years could experience kidney damage.
* Nickel: Some people who drink water containing nickel well in excess of the MCL over many years could experience heart and liver damage.
* Nitrate: Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome.
* Nitrite: Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome.
* Selenium: Selenium is an essential nutrient. However, some people who drink water containing selenium in excess of the MCL over many years could experience hair or fingernail losses, numbness in fingers or toes, or problems with their circulation.
* Thallium: Some people who drink water containing thallium in excess of the MCL over many years could experience hair loss, changes in their blood, or problems with their kidneys, intestines, or liver.
* 2,4-D: Some people who drink water containing the weed killer 2,4-D well in excess of the MCL over many years could experience problems with their kidneys, liver, or adrenal glands.
* 2,4,5-TP [Silvex]: Some people who drink water containing silvex in excess of the MCL over many years could experience liver problems.
* Acrylamide: Some people who drink water containing high levels of acrylamide over a long period of time could have problems with their nervous system or blood, and may have an increased risk of getting cancer.
* Alachlor: Some people who drink water containing alachlor in excess of the MCL over many years could have problems with their eyes, liver, kidneys, or spleen, or experience anemia, and may have an increased risk of getting cancer.
* Atrazine. Some people who drink water containing atrazine well in excess of the MCL over many years could experience problems with their cardiovascular system or reproductive difficulties.
* Benzo(a)pyrene (PAH). Some people who drink water containing benzo(a)pyrene in excess of the MCL over many years may experience reproductive difficulties and may have an increased risk of getting cancer.
* Carbofuran: Some people who drink water containing carbofuran in excess of the MCL over many years could experience problems with their blood, or nervous or reproductive systems. * Chlordane: Some people who drink water containing chlordane in excess of the MCL over many years could experience problems with their liver or nervous system, and may have an increased risk of getting cancer.
* Dalapon: Some people who drink water containing dalapon well in excess of the MCL over many years could experience minor kidney changes.
* Di(2-ethylhexyl)adipate: Some people who drink water containing di (2-ethylhexyl) adipate well in excess of the MCL over many years could experience general toxic effects or reproductive difficulties.
* Di(2-ethylhexyl)phthalate: Some people who drink water containing di (2-ethylhexyl) phthalate in excess of the MCL over many years may have problems with their liver, or experience reproductive difficulties, and may have an increased risk of getting cancer.
* Dibromochloropropane (DBCP): Some people who drink water containing DBCP in excess of the MCL over many years could experience reproductive difficulties and may have an increased risk of getting cancer.
* Dinoseb: Some people who drink water containing dinoseb well in excess of the MCL over many years could experience reproductive difficulties.
* Diquat: Some people who drink water containing diquat in excess of the MCL over many years could get cataracts.
* Dioxin (2,3,7,8-TCDD): Some people who drink water containing dioxin in excess of the MCL over many years could experience reproductive difficulties and may have an increased risk of getting cancer.
* Endothall: Some people who drink water containing endothall in excess of the MCL over many years could experience problems with their stomach or intestines.
* Endrin: Some people who drink water containing endrin in excess of the MCL over many years could experience liver problems.
* Epichlorohydrin: Some people who drink water containing high levels of epichlorohydrin over a long period of time could experience stomach problems, and may have an increased risk of getting cancer.
* Ethylene dibromide (EDB): Some people who drink water containing ethylene dibromide in excess of the MCL over many years could experience problems with their liver, stomach, reproductive system, or kidneys, and may have an increased risk of getting cancer.
* Glyphosate: Some people who drink water containing glyphosate in excess of the MCL over many years could experience problems with their kidneys or reproductive difficulties.
* Heptachlor: Some people who drink water containing heptachlor in excess of the MCL over many years could experience liver damage and may have an increased risk of getting cancer.
* Heptachlor Epoxide: Some people who drink water containing heptachlor epoxide in excess of the MCL over many years could experience liver damage, and may have an increased risk of getting cancer.
* Hexachlorobenzene: Some people who drink water containing hexachlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys, or adverse reproductive effects, and may have an increased risk of getting cancer.
* Hexachlorocyclopentadiene: Some people who drink water containing hexachlorocyclopentadiene well in excess of the MCL over many years could experience problems with their kidneys or stomach.
* Lindane: Some people who drink water containing lindane in excess of the MCL over many years could experience problems with their kidneys or liver.
* Methoxychlor: Some people who drink water containing methoxychlor in excess of the MCL over many years could experience reproductive difficulties.
* Oxamyl [Vydate]: Some people who drink water containing oxamyl in excess of the MCL over many years could experience slight nervous system effects.
* PCBs [Polychlorinated Biphenyls]: Some people who drink water containing PCBs in excess of the MCL over many years could experience changes in their skin, problems with their thymus gland, immune deficiencies, or reproductive or nervous system difficulties, and may have an increased risk of getting cancer.
* Pentachlorophenol: Some people who drink water containing pentachlorophenol in excess of the MCL over many years could experience problems with their liver or kidneys, and may have an increased risk of getting cancer.
* Picloram: Some people who drink water containing picloram in excess of the MCL over many years could experience problems with their liver.
* Simazine: Some people who drink water containing simazine in excess of the MCL over many years could experience problems with their blood.
* Toxaphene: Some people who drink water containing toxaphene in excess of the MCL over many years could have problems with their kidneys, liver, or thyroid, and may have an increased risk of getting cancer.
* Benzene: Some people who drink water containing benzene in excess of the MCL over many years could experience anemia or a decrease in blood platelets, and may have an increased risk of getting cancer.
* Carbon Tetrachloride: Some people who drink water containing carbon tetrachloride in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
* Chlorobenzene [Monochlorobenzene]: Some people who drink water containing chlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys.
* o-Dichlorobenzene: Some people who drink water containing o-dichlorobenzene well in excess of the MCL over many years could experience problems with their liver, kidneys, or circulatory systems.
* p-Dichlorobenzene: Some people who drink water containing p-dichlorobenzene in excess of the MCL over many years could experience anemia, damage to their liver, kidneys, or spleen, or changes in their blood.
* 1,2-Dichloroethane: Some people who drink water containing 1,2-dichloroethane in excess of the MCL over many years may have an increased risk of getting cancer.
* 1,1-Dichloroethylene:Some people who drink water containing 1,1-dichloroethylene in excess of the MCL over many years could experience problems with their liver.
* Cis-1,2-Dichloroethylene: Some people who drink water containing cis-1,2-dichloroethylene in excess of the MCL over many years could experience problems with their liver.
* Trans-1,2-Dichloroethylene: Some people who drink water containing trans-1,2-dichloroethylene well in excess of the MCL over many years could experience problems with their liver.
* Dichloromethane: Some people who drink water containing dichloromethane in excess of the MCL over many years could have liver problems and may have an increased risk of getting cancer.
* 1,2-Dichloropropane: Some people who drink water containing 1,2-dichloropropane in excess of the MCL over many years may have an increased risk of getting cancer.
* Ethylbenzene: Some people who drink water containing ethylbenzene well in excess of the MCL over many years could experience problems with their liver or kidneys.
* Methyl [tert] Butyl Ether (MTBE): Some people who drink water containing MTBE in excess of the MCL over many years may experience problems of the central nervous system, including loss of muscle coordination, tremors, difficulty breathing, and drowsiness.
* Styrene: Some people who drink water containing styrene well in excess of the MCL over many years could have problems with their liver, kidneys, or circulatory system.
* Tetrachloroethylene: Some people who drink water containing tetrachloroethylene in excess of the MCL over many years could have problems with their liver, and may have an increased risk of getting cancer.
* 1,2,4-Trichlorobenzene: Some people who drink water containing 1,2,4-trichlorobenzene well in excess of the MCL over many years could experience changes in their adrenal glands.
* 1,1,1-Trichloroethane: Some people who drink water containing 1,1,1-trichloroethane in excess of the MCL over many years could experience problems with their liver, nervous system, or circulatory system.
* 1,1,2-Trichloroethane: Some people who drink water containing 1,1,2-trichloroethane well in excess of the MCL over many years could have problems with their liver, kidneys, or immune systems.
* Trichloroethylene: Some people who drink water containing trichloroethylene in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
* Toluene: Some people who drink water containing toluene well in excess of the MCL over many years could have problems with their nervous system, kidneys, or liver.
* Vinyl Chloride: Some people who drink water containing vinyl chloride in excess of the MCL over many years may have an increased risk of getting cancer.
* Xylenes: Some people who drink water containing xylenes in excess of the MCL over many years could experience damage to their nervous system.
* Beta/photon emitters: Certain minerals are radioactive and may emit forms of radiation known as photons and beta radiation. Some people who drink water containing beta and photon emitters in excess of the MCL over many years may have an increased risk of getting cancer.
* Alpha emitters: Certain minerals are radioactive and may emit a form of radiation known as alpha radiation. Some people who drink water containing alpha emitters in excess of the MCL over many years may have an increased risk of getting cancer.
* Combined Radium 226/228: Some people who drink water containing radium 226 or 228 in excess of the MCL over many years may have an increased risk of getting cancer.
* Uranium: Some people who drink water containing uranium in excess of the MCL over many years may have an increased risk of getting cancer and kidney toxicity.
* Chlorine: Some people who use water containing chlorine well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chlorine well in excess of the MRDL could experience stomach discomfort.
* Chloramines: Some people who use water containing chloramines well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chloramines well in excess of the MRDL could experience stomach discomfort or anemia.
* Chlorine dioxide, where any two consecutive daily samples taken at the entrance to the distribution system are above the MRDL: Some infants and young children who drink water containing chlorine dioxide in excess of the MRDL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorine dioxide in excess of the MRDL. Some people may experience anemia.
* Add for public notification only: The chlorine dioxide violations reported today are the result of exceedances at the treatment facility only, not within the distribution system which delivers water to consumers. Continued compliance with chlorine dioxide levels within the distribution system minimizes the potential risk of these violations to consumers.
* Chlorine dioxide, where one or more distribution system samples are above the MRDL: Some infants and young children who drink water containing chlorine dioxide in excess of the MRDL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorine dioxide in excess of the MRDL. Some people may experience anemia.
* Add for public notification only: The chlorine dioxide violations reported today include exceedances of the EPA standard within the distribution system which delivers water to consumers. Violations of the chlorine dioxide standard within the distribution system may harm human health based on short-term exposures. Certain groups, including fetuses, infants, and young children, may be especially susceptible to nervous system effects from excessive exposure to chlorine dioxide-treated water.
* Disinfection byproducts and treatment technique for DBPs: The United States Environmental Protection Agency (EPA) sets drinking water standards and requires the disinfection of drinking water. However, when used in the treatment of drinking water, disinfectants react with naturally-occurring organic and inorganic matter present in water to form chemicals called disinfection byproducts (DBPs). EPA has determined that a number of DBPs are a health concern at certain levels of exposure. Certain DBPs, including some trihalomethanes (THMs) and some haloacetic acids (HAAs), have been shown to cause cancer in laboratory animals. Other DBPs have been shown to affect the liver and the nervous system, and cause reproductive or developmental effects in laboratory animals. Exposure to certain DBPs may produce similar effects in people. EPA has set standards to limit exposure to THMs, HAAs, and other DBPs.
* Bromate: Some people who drink water containing bromate in excess of the MCL over many years may have an increased risk of getting cancer.
* Chlorite: Some infants and young children who drink water containing chlorite in excess of the MCL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorite in excess of the MCL. Some people may experience anemia.
* Haloacetic Acids (HAA): Some people who drink water containing haloacetic acids in excess of the MCL over many years may have an increased risk of getting cancer.
* TTHMs [Total Trihalomethanes]: Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous systems, and may have an increased risk of getting cancer.
Drinking water containing fluoride in excess of the MCL over many years may cause mottling of children's teeth, usually in children less than nine years old. Mottling, also known as dental fluorosis, may include brown staining and/or pitting of the teeth, and occurs only in developing teeth before they erupt from the gums. Fluoride in drinking water at twice the MCL may cause bone disease, including pain and tenderness of the bones.
For more information, please call [name of water system contact] of [name of community water system] at [phone number]. Some home water treatment units are also available to remove fluoride from drinking water. To learn more about available home water treatment units, you may call NSF International at 1-877-8-NSF-HELP.
Contaminant | MCL/MRDL/TT violations2 | Monitoring and Testing Procedure violations | |||
Tier of Public Notice Required | Citation | Tier of Public Notice Required | Citation | ||
1. Violations of National Primary Drinking Water Regulations (NPDWR)3 | |||||
A. Microbiological Contaminants | |||||
1.a. Total coliform bacteria [DAGGER] | 2 | 7.0 | 3 | 7.0 | |
1.b Total coliform (TT violations resulting from failure to perform assessments or corrective actions, monitoring violations, and reporting violations) [DOUBLE DAGGER] | 2 | 7.4.10.2.1 | 3 | 7.4.10.3.1 | |
1.c Seasonal system failure to follow Division-approved start-up plan prior to serving water to the public or failure to provide certification to the Division [DOUBLE DAGGER] | 2 | 7.4.4.10.2.2 | 3 | 7.4.10.4.3 | |
2.a Fecal coliform/E. coli [DAGGER] | 1 | 7.0 | 41,3 | 7.0 | |
2.b E. coli (MCL, monitoring, and reporting violations) [DOUBLE DAGGER] | 1 | 7.4.10.1 | 3 | 7.4.10.3.2 7.4.10.4.1 7.4.10.4.2 | |
2.c E. coli (TT violations resulting from failure to perform Level 2 Assessments or corrective action) [DOUBLE DAGGER] | 2 | 7.4.10.2.1 | |||
3. Turbidity MCL | 2 | 16.4 | 3 | 16.5 | |
4. Turbidity MCL (average of 2 days samples >5 NTU) | 52,1 | 16.4 | 3 | 16.5 | |
5. Turbidity (for TT violations resulting from a single exceedance of maximum allowable turbidity level) | 62,1 | 16.4 | 3 | 16.5 | |
6. Surface Water Treatment rule violations, other than violations resulting from single exceedance of max. allowable turbidity level (TT) | 2 | 16.0 | 3 | 16.0 | |
7. Interim Enhanced Surface Water Treatment Rule violations, other than violations resulting from single exceedance of max. allowable turbidity level (TT) | 72 | 17.0 | 3 | 17.0 | |
8. Filter Backwash Recycling Rule violations. | 2 | 18.0 | 3 | 18.0 | |
9. Long Term 1 Enhanced Surface Water Treatment Rule violations] | 2 | 19.0 | 3 | 19.0 | |
10. Long Term 2 Enhanced Surface water Treatment Rule violations | 2 | 20.0 | 222,3 | 20.2-20.6 and 20.9-20.10 | |
11.Ground Water Rule Violations | 2 | 8.0 | 3 | 8.4.2 | |
B. Inorganic Chemicals (IOCs) | |||||
1. Antimony | 2 | 9.1 | 3 | 9.1.2 | |
2. Arsenic | 2 | 89.1 | 3 | 119.1.2 | |
3. Asbestos(fibers >10 microns) | 2 | 9.1 | 3 | 9.1.2 | |
4. Barium | 2 | 9.1 | 3 | 9.1.2 | |
5. Beryllium | 2 | 9.1 | 3 | 9.1.2 | |
6. Cadmium | 2 | 9.1 | 3 | 9.1.2 | |
7. Chromium (Total) | 2 | 9.1 | 3 | 9.1.2 | |
8. Cyanide | 2 | 9.1 | 3 | 9.1.2 | |
9. Fluoride | 1,2 | 9.1 | 3 | 9.1.2 | |
10. Mercury (inorganic) | 2 | 9.1 | 3 | 9.1.2 | |
11. Nickel | 2 | 9.1 | 3 | 9.1.2 | |
12. Nitrate | 1 | 9.1 | 121,3 | 9.1.2 | |
13. Nitrite | 1 | 9.1 | 121,3 | 9.1.2 | |
14. Total Nitrate and Nitrite | 1 | 9.1 | 3 | 9.1.2 | |
15. Selenium | 2 | 9.1 | 3 | 9.1.2 | |
16. Thallium | 2 | 9.1 | 3 | 9.1.2 | |
C. Lead and Copper Rule (Action level for lead is 0.015 mg/L, for copper is 1.3 mg/L) | |||||
1. Lead and Copper rule (TT) | 2 | 10.0 | 3 | 10.0 | |
D. Synthetic Organic Chemicals (SOCs) | |||||
1. 2,4 - D | 2 | 9.2.1.1 | 3 | 9.2.2 | |
2. 2,4,5 -TP | 2 | 9.2.1.1 | 3 | 9.2.2 | |
3. Alachlor | 2 | 9.2.1.1 | 3 | 9.2.2 | |
4. Atrazine | 2 | 9.2.1.1 | 3 | 9.2.2 | |
5. Benzo(a)pyrene (PAHs) | 2 | 9.2.1.1 | 3 | 9.2.2 | |
6. Carbofuran | 2 | 9.2.1.1 | 3 | 9.2.2 | |
7. Chlordane | 2 | 9.2.1.1 | 3 | 9.2.2 | |
8. Dalapon | 2 | 9.2.1.1 | 3 | 9.2.2 | |
9. Di (2-ethylhexyl) adipate | 2 | 9.2.1.1 | 3 | 9.2.2 | |
10. Di (2-ethylhexyl) phthalate | 2 | 9.2.1.1 | 3 | 9.2.2 | |
11. Dibromochloropropane | 2 | 9.2.1.1 | 3 | 9.2.2 | |
12. Dinoseb | 2 | 9.2.1.1 | 3 | 9.2.2 | |
13. Dioxin (2,3,7,8 - TCDD) | 2 | 9.2.1.1 | 3 | 9.2.2 | |
14. Diquat | 2 | 9.2.1.1 | 3 | 9.2.2 | |
15. Endothall | 2 | 9.2.1.1 | 3 | 9.2.2 | |
16. Endrin | 2 | 9.2.1.1 | 3 | 9.2.2 | |
17. Ethylene Dibromide | 2 | 9.2.1.1 | 3 | 9.2.2 | |
18. Glyphosate | 2 | 9.2.1.1 | 3 | 9.2.2 | |
19. Heptachlor | 2 | 9.2.1.1 | 3 | 9.2.2 | |
20. Heptachlor epoxide | 2 | 9.2.1.1 | 3 | 9.2.2 | |
21. Hexachlorobenzene | 2 | 9.2.1.1 | 3 | 9.2.2 | |
22. Hexachlorocyclopentadiene | 2 | 9.2.1.1 | 3 | 9.2.2 | |
23. Lindane | 2 | 9.2.1.1 | 3 | 9.2.2 | |
24. Methoxychlor | 2 | 9.2.1.1 | 3 | 9.2.2 | |
25. Oxamyl (Vydate) | 2 | 9.2.1.1 | 3 | 9.2.2 | |
26. Pentachlorophenol | 2 | 9.2.1.1 | 3 | 9.2.2 | |
27. Picloram | 2 | 9.2.1.1 | 3 | 9.2.2 | |
28. Polychlorinated biphenyls (PCBs) | 2 | 9.2.1.1 | 3 | 9.2.2 | |
29. Simazine | 2 | 9.2.1.1 | 3 | 9.2.2 | |
30. Toxaphene | 2 | 9.2.1.1 | 3 | 9.2.2 | |
E. Volatile Organic Chemicals (VOCs) | |||||
1. Benzene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
2. Carbon tetrachloride | 2 | 9.2.1.3 | 3 | 9.2.2 | |
3. Chlorobenzene (monochlorobenzene) | 2 | 9.2.1.3 | 3 | 9.2.2 | |
4. o-Dichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
5. p-Dichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
6. 1,2-Dichloroethane | 2 | 9.2.1.3 | 3 | 9.2.2 | |
7. 1,1-Dichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
8. cis-1,2,-Dichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
9. trans-1,2-Dichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
10. Dichloromethane | 2 | 9.2.1.3 | 3 | 9.2.2 | |
11. 1,2-Dichloropropane | 2 | 9.2.1.3 | 3 | 9.2.2 | |
12. Ethylbenzene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
13. Styrene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
14. Tetrachloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
15. Toluene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
16. 1,2,4-Trichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
17. 1,1,1-Trichloroethane | 2 | 9.2.1.3 | 3 | 9.2.2 | |
18. 1,1,2-Trichloroethane | 2 | 9.2.1.3 | 3 | 9.2.2 | |
19. Trichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2 | |
20. Vinyl chloride | 2 | 9.2.1.3 | 3 | 9.2.2 | |
21. Xylenes (total) | 2 | 9.2.1.3 | 3 | 9.2.2 | |
22. Methyl tert Butyl Ether | 2 | 9.2.1.3 | 3 | 9.2.2 | |
F. Radioactive Contaminants | |||||
1. Beta/photon emitters | 2 | 16.1.1.4 | 3 | 16.2 | |
2. Alpha emitters | 2 | 16.1.1.3 | 3 | 16.2 | |
3. Combined radium (226 & 228) | 2 | 16.1.1.2 | 3 | 16.2 | |
4. Uranium | 92 | 16.1.1.5 | 103 | 16.2 | |
G. Disinfection Byproducts (DBPs), Byproduct Precursors, Disinfection Residuals.13 | |||||
1. Total trihalomethanes (TTHMs) | 2 | 149.2.1.2, 9.2.2.1.11, 9.3.1.1, 9.3.1.2 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3, 13.0 to 13.6, 14.0 to 14.9 | |
2. Haloacetic Acids (HAA5) | 2 | 9.2.1.2, 9.2.2.1.11, 9.3.1.1, 9.3.1.2 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3, 13.0 to 13.6, 14.0 to 14.9 | |
3. Bromate | 2 | 9.2.1.2, 9.2.2.1.11 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3 | |
4. Chlorite | 2 | 9.2.1.2, 9.2.2.1.11 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3 | |
5. Chlorine(MRDL) | 2 | 1.19.3.1 | 3 | 12.6.1 to 12.6.5, 12.8.1 | |
6. Chloramine (MRDL) | 2 | 1.19.3.1 | 3 | 12.6.1 to 12.6.5, 12.8.1 | |
7. Chlorine dioxide (MRDL), where any two consecutive daily samples at entrance to the distribution system only are above MRDL | 2 | 1.19.3.1, 12.14.2 | 215,3 | 12.6.1 to 12.6.5, 12.8.2, 12.14.2 | |
8. Chlorine dioxide (MRDL), where sample(s) in distribution system the next day are also above MRDL | 161 | 1.19.3.1, 12.14.2 | 1 | 12.6.1 to 12.6.5, 12.8.2, 12.14.2 | |
9. Control of DBP precursors - TOC (TT) | 2 | 12.16 | 3 | 12.6.1 to 12.6.5, 12.9 | |
10. Bench marking and disinfection profiling | N/A | N/A | 3 | 17.5 | |
11. Development of monitoring plan | N/A | N/A | 3 | 12.11 | |
H. Other Treatment Techniques | |||||
1. Acrylamide | 2 | 9.3.3 | N/A | N/A | |
2. Epichlorohydrin | 2 | 9.3.3 | N/A | N/A | |
II. Unregulated Contaminant Monitoring17 | |||||
A. Unregulated contaminants | N/A | N/A | 3 | 40 CFR 141.40 | |
III. Other Situations Requiring Public Notice | |||||
A. Exceedance of nitrate MCL for non-community systems, as allowed by the Division | 1 | 9.1.12 | N/A | N/A | |
B. Availability of unregulated contaminant monitoring data | 3 | 40 CFR 141.40 | N/A | N/A | |
C. Waterborne disease outbreak | 1 | 2.0 | N/A | N/A | |
D. Other waterborne emergency20 | 1 | N/A | N/A | N/A | |
E. Other situations as determined by the Division | 211,2,3 | N/A | N/A | N/A | |
F. Source water sample positive for Ground Water Rule Fecal indicators: E. coli, enterococci, or coliphage. | 1 | 8.3 | N/A | N/A | |
[DAGGER] Until December 31, 2015
[DOUBLE DAGGER] Beginning January 1, 2016
1 Violations and other situations not listed in this table (e.g., failure to prepare Consumer Confidence Reports) do not require notice, unless otherwise determined by the Division. The Division may, at their option, also require a more stringent public notice tier (e.g., Tier 1 instead of Tier 2 or Tier 2 instead of tier 3) for specific violations and situations listed in this Table, as authorized under subsection 4.2.1.1.5.
2 MCL - Maximum Contaminant Level, MRDL - Maximum Residual Disinfectant Level, TT - Treatment Technique
3 The term Violations of National Primary Drinking Water Regulations (NPDWR) is used here to include violations of MCL, MRDL, treatment technique, monitoring, and testing procedure requirements.
4 Failure to test for fecal coliform or E. coli is a Tier 1 violation if testing is not done after any repeat sample tests positive for coliform. All other total coliform monitoring and testing procedure violations are Tier 3
5 Systems that violate the turbidity MCL of 5 NTU based on an average of measurements over two consecutive days must consult with the Division within 24 hours after learning of the violation. Based on this consultation, the Division may subsequently decide to elevate the violation to Tier 1. If a system is unable to make contact with the Division in the 24-hour period, the violation is automatically elevated to Tier 1.
6 Systems with treatment technique violations involving a single exceedance of a maximum turbidity limit under the Surface Water Treatment Rule (SWTR), the Interim Enhanced Surface Water Treatment Rule (IESWTR) or the Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR are required to consult with the Division within 24 hours after learning of the violation. Based on this consultation, the Division may subsequently decide to elevate the violation to Tier 1. If a system is unable to make contact with the Division in the 24-hour period, the violation is automatically elevated to Tier 1.
7 Most of the requirements of the IESWTR Section 18.0 become effective January 1, 2002 for Subpart H systems (surface water systems and groundwater under the direct influence of surface water) serving at least 10,000 persons. However, subsection 10.8 has some requirements that become effective as early as April 16, 1999. The SWTR remains in effect for systems serving at least 10,000 persons even after 2002; the IESWTR adds additional requirements and does not in many cases supersede the SWTR.
8 The arsenic MCL citations are effective January 23, 2006. Until then, the citations are § 141.11 (b) and § 141.23 (n).
9 The uranium MCL Tier 2 violation citations are effective December 8, 2003 for all community water systems.
10 The uranium Tier 3 violation citations are effective December 8, 2000 for all community water systems.
11 The arsenic Tier 3 violation MCL citations are effective December 8, 2003 for all community water systems.
12 Failure to take a confirmation sample within 24 hours for nitrate or nitrite after an initial sample exceeds the MCL is a Tier 1 violation. Other monitoring violations for nitrate are Tier 3.
13 Surface water or ground water under the direct influence of surface water community and non-transient non-community systems serving [GREATER THEN OR EQUAL TO]10,000 must comply with new DBP MCLs, disinfectant MRDLs, and related monitoring requirements beginning January 1, 2002. All other community and non-transient non-community systems must meet the MCLs and MRDLs beginning January 1, 2004. Surface water or ground water under the direct influence of surface water transient non-community systems serving 10,000 or more persons and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2002. Surface water or ground water under the direct influence of surface water transient non-community systems serving fewer than 10,000 persons and using only groundwater not under the direct influence of surface water and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2004.
1440 CFR 141.64(b)(1)141.132(a)-(b) apply until §§ 141.620-141.630 take effect under the schedule in § 141.620 (c).
15 Failure to monitor for chlorine dioxide at the entrance to the distribution system the day after exceeding the MRDL at the entrance to the distribution system is a Tier 2 violation.
16 If any daily sample taken at the entrance to the distribution system exceeds the MRDL for chlorine dioxide and one or more samples taken in the distribution system the next day exceed the MRDL, Tier 1 notification is required. Failure to take the required samples in the distribution system after the MRDL is exceeded at the entry point also triggers Tier 1 notification.
17 Some water systems must monitor for certain unregulated contaminants listed in 40 CFR 141.40
20 Other waterborne emergencies require a Tier 1 public notice under subsection 4.2.1.1.1.1.8 for situations that do not meet the definition of a waterborne disease outbreak given in 40 CFR 141.2 but that still have the potential to have serious adverse effects on health as a result of short-term exposure. These could include outbreaks not related to treatment deficiencies, as well as situations that have the potential to cause outbreaks, such as failures or significant interruption in water treatment processes, natural disasters that disrupt the water supply or distribution system, chemical spills, or unexpected loading of possible pathogens into the source water.
21 The Division may place other situations in any tier it believes appropriate, based on threat to public health.
22 Failure to collect three or more samples for Cryptosporidium analysis is a Tier 2 violation requiring special notice as specified in subsection 4.2.1.1.1.1.6. All other monitoring and testing violations are Tier 3.
* if your home or water system has lead pipes, or
* if your home has copper pipes with lead solder, and
* if the home is less than five (5) years old
* if you have soft or acidic water, or
* if water sits in the pipes for several hours.
16 Del. Admin. Code § 4462-4.0
20 DE Reg. 808(4/1/2017)
24 DE Reg. 794(2/1/2021)
24 DE Reg. 904( 4/1/2021) (Errata)