Jump to main content or area navigation.

Contact Us

Water: Interim Enhanced Surface Water Treatment Rule

Interim Enhanced Surface Water Treatment Rule

The Interim Enhanced Surface Water Treatment Rule improves control of microbial contaminants, particularly Cryptosporidium, in systems using surface water, or ground water under the direct influence of surface water, that serve 10,000 or more persons. The rule builds upon the treatment technique requirements of the Surface Water Treatment Rule.

Federal Register Notices

Fact Sheets

Quick Reference Guides

Guidance

Training and Training Materials


Jump to main content.