Drinking Water Regulations

Long Term 2 Enhanced Surface Water Treatment Rule

The US Environmental Protection Agency recently published the Long Term 2 Enhanced Surface Water Treatment Rule to reduce diseases associated with Cryptosporidium and other disease-causing microorganisms in drinking water. The Rule will supplement existing regulations by requiring additional Cryptosporidium treatment at higher risk water suppliers. This regulation also helps to ensure that suppliers maintain protection against microorganisms as they take steps to reduce the formation of disinfection byproducts.

LT2 Bin Calculator Spreadsheets

LT2ESWTR External Links

  • EPA's LT2 ESWTR Information(opens in a new tab)
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  • This link will take you to EPA's website on the Long Term 2 Enhanced Surface Water Treatment Rule. You can view or download technical guidance manuals, obtain fact sheets, and see the federal version of the rule.