Public and private water supplies

The following criteria apply to surface waters of the state having the designated beneficial use of Public and Private Water Supplies: (1) Raw water numerical criteria. For surface water designated as public and private water supplies, the numerical criteria for substances identified under the "Public and Private Water Supply (Raw Water)" column in Table 2 of Appendix G of this Chapter shall not be exceeded. Raw water numerical criteria are considered long-term average standards. For purposes of permitting discharges for attainment of these standards, the permitting authority shall use long- term average receiving stream flows and complete mixing of effluent and receiving water to determine appropriate permit limits. (2) Radioactive materials. (A) There shall be no discharge of radioactive materials in excess of the criteria found in Title 10 Code of Federal Regulations Part 20, Appendix B, Table 2. (B) The concentration of gross alpha particles shall not exceed the criteria specified in (A) through (D) of this subparagraph, or the naturally occurring concentration, whichever is higher. (i) The combined dissolved concentration of Radium-226 and Radium-228, and Strontium-90, shall not exceed 5 picocuries/liter, and 8 picocuries/liter, respectively. (ii) Gross alpha particle concentrations, including Radium-226 but excluding radon and uranium, shall not exceed 15 picocuries/liter. (iii) The gross beta concentration shall not exceed 50 picocuries/liter. (iv) The average annual concentration of beta particle and photon radioactivity from man-made radionuclides in waters having the designated use of Public and Private Water supply shall not produce an annual dose equivalent to the total body or any internal organ greater than 4 millirem/year. (3) Coliform bacteria. (A) The bacteria of the total coliform group shall not exceed a monthly geometric mean of 5,000/100 ml at a point of intake for public or private water supply. (B) The geometric mean will be determined by multiple tube fermentation or membrane filter procedures based on a minimum of not less than five (5) samples taken over a period of not more than thirty (30) days. (C) Further, in no more than 5% of the total samples during any thirty (30) day period shall the bacteria of the total coliform group exceed 20,000/100 ml. (D) In cases where both public and private water supply and primary body contact recreation uses are designated, the primary body contact criteria will apply. (4) Oil and grease (petroleum and non-petroleum related). For Public and Private Water Supplies, surface waters of the state shall be maintained free from oil and grease and taste and odors. (5) General criteria. (A) The quality of the surface waters of the state which are designated as public and private water supplies shall be protected, maintained, and improved when feasible, so that the waters can be used as sources of public and private raw water supplies. 13 (B) These waters shall be maintained so that they will not be toxic, carcinogenic, mutagenic, or teratogenic to humans. (6) Water column criteria to protect for the consumption of fish flesh and water. (A) Surface waters of the state with the designated beneficial use of Public and Private Water Supply shall be protected to allow for the consumption of fish, shellfish and water. (B) The water column numerical criteria to protect human health for the consumption of fish flesh and water for the substances identified in Table 2 of Appendix G of this Chapter shall be as prescribed under the "Fish Consumption and Water" column in Table 2 of Appendix G in all surface waters designated with the beneficial use of Public and Private Water Supply. Water column numerical criteria to protect human health for the consumption of fish flesh and water are considered long-term average standards. For purposes of permitting discharges for attainment of these standards, the permitting authority shall use long-term average receiving stream flows and complete mixing of effluent and receiving water to determine appropriate permit limits. Water column criteria to protect human health for the consumption of fish flesh only may be found in the column "Fish Consumption" in Table 2 of Appendix G of this Chapter. (7) Chlorophyll-a numerical criterion for certain waters. The long-term average concentration of chlorophyll-a at a depth of 0.5 meters below the surface shall not exceed 0.010 milligrams per liter in Wister Lake, Tenkiller Ferry Reservoir, nor any waterbody designated SWS or SWS-R in Appendix A of this Chapter. Wherever such criterion is exceeded, numerical phosphorus or nitrogen criteria or both may be promulgated. (8) Phosphorus numerical criterion applicable to certain waters. The long-term average total phosphorus concentration at a depth of 0.5 meters below the surface shall not exceed 0.0168 milligrams per liter in Lake Eucha and 0.0141 milligrams per liter in Spavinaw Lake.