Current through Register Vol. XLI, No. 24, June 14, 2024
Section 64-4-4 - Classification of Public Water Systems4.1. A PWS is classified on the basis of source water, population, and the complexity of the water treatment processes. 4.1.1. 1D: A transient non-community PWS that has groundwater only as a source and does not use gaseous chlorine or chlorine dioxide as a means of disinfection and does not treat for the removal of nitrate or nitrite, or both. A groundwater source that uses gaseous chlorine, chlorine dioxide as a means of disinfection, or has treatment for removal of nitrate or nitrite, or both is at least a Class I PWS.4.1.2. Class R: A non-transient PWS that retreats at the point of entry, with anything other than chlorine, another PWS's finished water for facility use and consumption only. A Class R that provides water to another PWS is at least a Class I PWS.4.1.3. Water Distribution System (WDS): A PWS that obtains all of its water from another PWS and is not owned or operated by the supplying PWS. A WDS does not have any other source of water other than water from the supplying PWS. A WDS may apply chlorine for supplemental disinfection but otherwise does not treat its water. A WDS that retreats with anything other than chlorine is at least a Class I PWS.4.1.4. Class I: A community or non-transient non-community PWS with a GW source that serves a population of less than 10,000, including consecutive connection population, and does not treat for an identified primary contaminant. A transient non-community PWS that has a GW source that uses gaseous chlorine, chlorine dioxide as a means of disinfection, or has treatment for removal of nitrate or nitrite, or both.4.1.5. Class II: A community or non-transient non-community PWS with:4.1.5.a. A GW source that serves a population of less than 10,000, including consecutive connections, and either treats for an identified primary contaminant, or has a treatment technique as identified in 40CFR 141.73;4.1.5.b. A GW source that serves a population of at least 10,000, including consecutive connections that does not treat for an identified primary contaminant; or,4.1.5.c. A GUDI or SW source that serves a population of less than 10,000, including consecutive connections.4.1.6. Class III: A community or non-transient non-community PWS with:4.1.6.a. A GW source that serves a population of greater than 10,000, including consecutive connections, and either treats for an identified primary contaminant, or has a treatment technique as identified in 40CFR 141.73; or,4.1.6.b. A GUDI or SW source that serves a population of at least 10,000, but less than 20,000, including consecutive connections.4.1.7. Class IV: A community or non-transient non-community PWS with a GUDI or SW source that serves a population of at least 20,000, including consecutive connection population, and has treatment.