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Water: Long Term 1 Enhanced Surface Water Treatment Rule

Long Term 1 Enhanced Surface Water Treatment Rule

EPA finalized the Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) on January 14th, 2002. The purposes of the LT1ESWTR are to improve control of microbial pathogens, specifically the protozoan Cryptosporidium, in drinking water, and address risk trade-offs with disinfection byproducts.

The rule will require certain public water systems to meet strengthened filtration requirements. It will also require systems to calculate levels of microbial inactivation to ensure that microbial protection is not jeopardized if systems make changes to comply with requirements of the Stage 1 Disinfectants and Disinfection Byproducts Rule (Stage 1-DBPR). This rule, which addresses subpart H systems serving fewer than 10,000 persons, builds upon the framework established for larger systems in the Interim Enhanced Surface Water Treatment Rule (IESWTR).

Final Rule

Guidance Documents (ALL ABOUT PDF FILES)

Related Links

The following guidance documents developed for the Interim Enhanced Surface Water Treatment Rule (IESWTR) may also apply to the LT1ESWTR:

Additional guidance materials for the Long Term 1 Enhanced Surface Water Treatment Rule are currently under development. Please check back for updates to the site.

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