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WATER QUALITY OBJECTIVES FOR GROUND WATERS The following objectives apply to all ground waters of the Sacramento and San Joaquin River Basins, as the objectives are relevant to the protection of designated beneficial uses. These objectives do not require improvement over naturally occurring background concentrations. The ground water objectives contained in this plan are not required by the federal Clean Water Act. Bacteria In ground waters used for domestic or municipal supply (MUN)the most probable number of coliform organisms over any seven-day period shall be less than 2.2/100 ml. Chemical Constituents Ground waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses. At a minimum, ground waters designated for use as domestic or municipal supply(MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels (MCLS) specified in the following provisions of Title 22 of the California Code of Regulations, which are incorporated by reference into this plan: Tables 64431-A (Inorganic Chemicals) and 64431-B (Fluoride) of Section 64431, Table 64444-A (Organic Chemicals)of Section 64444, and Tables 64449-A (Secondary Maximum Contaminant Levels-Consumer Acceptance Limits) and 64449-B (Secondary Maximum Contaminant Levels-Ranges) of Section 64449. This incorporation- by-reference is prospective, including future changes to the incorporated provisions as the changes take effect. At a minimum,water designated for use as domestic or municipal supply (MUN) shall not contain lead in excess of 0.015 mg/1. To protect all beneficial uses, the Regional Water Board may apply limits more stringent than MCLs. Radioactivity At a minimum, ground waters designated for use as domestic or municipal supply(MUN) shall not contain concentrations of radionuclides in excess of the maximum contaminant levels (MCLs) specified in Table 4 (MCL Radioactivity) of Section 64443 of Title 22 of the California Code of Regulations,which are incorporated by reference into this plan. This incorporation-by-reference is prospective, including future changes to the incorporated provisions as the changes take effect. Tastes and Odors Ground waters shall not contain taste-or odor-producing substances in concentrations that cause nuisance or adversely affect beneficial uses. Toxicity Ground waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life associated with designated beneficial use(s). This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. —Fran the Water Quality Control Plan Report:Sacramento River Basin(5A)and San Joaquin Basin(5B)