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The purpose of the rule is to ensure adequate treatment of surface water sources with higher levels of Cryptosporidium and to address uncovered finished water reservoirs. The rule applies to all public water systems that use surface water or groundwater under the direct influence of surface water (GWUDI).
Source water monitoring is required for all surface water and GWUDI systems: one round around now and one round 9 years later.
Systems must report data monthly. Source water monitoring must begin by the start dates shown in Table 1:
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