Frequent Questions

Under the Long Term 1 Enhanced Surface Water Treatment Rule, how is Cryptosporidium regulated at public water systems that serve fewer than 10,000 persons and use surface water or ground water under the direct influence of surface water?

Filtered systems must achieve at least 2-log (99 percent) removal of Cryptosporidium by meeting strengthened combined filter effluent turbidity limits. Unfiltered systems must maintain and improve Cryptosporidium control under previously existing watershed control plans (67 FR 1811, 1814; January 14, 2002).

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