N.D. Admin. Code tit. 33, art. 33-16, ch. 33-16-02.1, tbl. 1
CAS 1 No. | Substance or Characteristic (a = aquatic life) (b = municipal & domestic drinking water) (c = agricultural, irrigation, industrial) (d = recreation) | Maximum Limit |
7429905 | Aluminum (a) | Acute Standard 750 micrograms per liter (µg/l) Chronic Standard 87 µg/l Where the pH is equal to or greater than 7.0, and the hardness is equal to or greater than 50 mg/l as CaCO3 in the receiving water after mixing, the 87 µg/l chronic total recoverable aluminum criterion will not apply, and aluminum will be regulated based on compliance with the 750 µg/l acute total recoverable aluminum criterion. |
7446-41-7 | Ammonia (Total as N) (a) | Acute Standard The one-hour average concentration of total ammonia (expressed as N in mg/l) does not exceed, more often than once every three years on the average, the numerical value given by the following formula: |
where salmonids are absent; or | ||
where salmonids are present. Chronic Standard The 30-day average concentration of total ammonia (expressed as N in mg/l) does not exceed, more often than once every three years on the average, the numerical value given by the following formula; and the highest 4-day average concentration of total ammonia within the 30-day averaging period does not exceed 2.5 times the numerical value given by the following formula: | ||
where CV = 2.85, when temperature (T) is <= 14°C; or where: | ||
when T > 14°C Site-Specific Chronic Standard The following site-specific standard applies to the Red River of the North beginning at the 12th Avenue North bridge in Fargo, North Dakota, and extending approximately 32 miles downstream to its confluence with the Buffalo River, Minnesota. This site-specific standard applies only during the months of October, November, December, January, and February. During the months of March through September, the statewide chronic ammonia standard applies. | ||
The 30-day average concentration of total ammonia (expressed as N in mg/l) does not exceed, more often than once every three years on the average, the numerical value given by the following formula; and the highest 4-day average concentration of total ammonia within the 30-day averaging period does not exceed 2.5 times the numerical value given by the following formula: | ||
where CV = 4.63, when T <= 7° C; or or where: | ||
when T > 7°C | ||
7440-39-3 | Barium (Total) (b) | 1.0 mg/l (1-day arithmetic average) |
7440-42-8 | Boron (Total) (c) | 0.75 mg/l (30-day arithmetic average) |
16887-00-6 | Chloride (Total) (a, b, c) | Class I: 100 mg/l (30-day arithmetic average) Class IA: 175 mg/l (30-day arithmetic average) Class II and Class III: 250 mg/l (30-day arithmetic average) |
7782-50-5 | Chlorine | Acute: 0.019 mg/l |
Residual (Total) (a) | Chronic: 0.011 mg/l | |
7782-44-7 | Dissolved Oxygen (a) | 5 mg/l as a daily minimum (up to 10% of representative samples collected during any 3-year period may be less than this value provided that lethal conditions are avoided) |
14797-55-8 | Nitrate as N2 (a, b) | 1.0 mg/l (up to 10% of samples may exceed) |
14797-65-0 | Nitrite as N (b) | 1.0 mg/l |
E. coli3 (d) | Not to exceed 126 organisms per 100 ml as a geometric mean of representative samples collected during any 30-day consecutive period, nor shall more than 10 percent of samples collected during any 30-day consecutive period individually exceed 409 organisms per 100 ml. For assessment purposes, the 30-day consecutive period shall follow the calendar month. This standard shall apply only during the recreation season May 1 to September 30. | |
pH (a) | Class I and IA: 7.0 - 9.0 (up to 10% of representative samples collected during any 3-year period may exceed this range, provided that lethal conditions are avoided). Class II and Class III: 6.0 - 9.0 (up to 10% of representative samples collected during any 3-year period may exceed this range, provided that lethal conditions are avoided). | |
108-95-2 | Phenols (Total) (b) | 0.3 mg/l (organoleptic criterion) (one-day arithmetic average) |
7440-23-5 | Sodium (b, c) | Class I: 50 percent of total cations as milliequivalents per liter (mEq/l) Class IA, II, and III: 60 percent of total cations as mEq/l |
18785-72-3 | Sulfates (Total as SO4) (b) | Class I: 250 mg/l (30-day arithmetic average) Class IA and II: 450 mg/l (30-day arithmetic average) Class III: 750 mg/l (30-day arithmetic average) |
Sulfates (Total as SO4) (a, b) | Site Specific: 750 mg/l (maximum) applies to the Sheyenne River from its headwaters to 0.1 mile downstream from Baldhill Dam 131.10(b) requirement: The water quality standards for the Red River and the portions of the Sheyenne River located downstream from the segment of the Sheyenne River to which the site-specific sulfate standard applies must continue to be maintained. The Sheyenne River from 0.1 mile downstream from Baldhill Dam to the confluence with the Red River shall not exceed 450 mg/l sulfate (total) 30-day arithmetic average, and the Red River shall not exceed 250 mg/l sulfate (total) 30-day arithmetic average after mixing downstream from the confluence of the Sheyenne River. Regulated pollution control efforts must be developed to achieve compliance with these water quality standards. | |
Temperature (a) | Eighty-five degrees Fahrenheit [29.44 degrees Celsius]. The maximum increase shall not be greater than five degrees Fahrenheit [2.78 degrees Celsius] above natural background conditions. | |
Combined radium 226 and radium 228 (Total) (b) | 5 pCi/l (30-day arithmetic average) | |
Gross alpha particle activity, including radium 226, but excluding radon and uranium (b) | 15 pCi/l (30-day arithmetic average) | |
| 1 CAS No. is the chemical abstract service registry number. The registry database contains records for specific substances identified by the chemical abstract service. | ||
| 2 The standard for nitrates (N) is intended as benchmark concentration when stream or lake specific data is insufficient to determine the concentration that will cause excessive plant growth (eutrophication). However, in no case shall the concentration for nitrate plus nitrite N exceed 10 mg/l for any waters used as a municipal or domestic drinking water supply. | ||
| 3 Where the E. Coli criteria are exceeded and there are natural sources, the criteria may be considered attained, provided there is reasonable basis for concluding that the indicator bacteria density attributable to anthropogenic sources is consistent with the level of water quality required by the criteria. This may be the situation, for example, in headwater streams that are minimally affected by anthropogenic activities. | ||
N.D. Admin Code tit. 33, art. 33-16, ch. 33-16-02.1, tbl. 1