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

• National Primary Drinking Water Regulations: Interim Enhanced Surface Water Treatment
  December 16, 1998 (Volume 63, Number 241, pages 69477-69521)
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• Revisions to the Interim Enhanced Surface Water Treatment Rule (IESWTR), the Stage 1 Disinfectants and Disinfection Byproducts Rule (Stage 1DBPR), and Revisions to State Primacy Requirements To Implement the Safe Drinking Water Act (SDWA) Amendments Final Rule -- 66 FR 3770, January 16, 2001
• National Primary Drinking Water Regulations: Interim Enhanced Surface Water Treatment Rule Notice of Data Availability
  Federal Register, November 3, 1997 (Volume 62, Number 212), Part III
• • Fact Sheet on New Data Available on Microbials and Disinfection Byproducts

Fact Sheets

• Interim Enhanced Surface Water Treatment Rule | PDF Version (5 pp, 20 K)
• Interim Enhanced Surface Water Treatment Rule: What Does it Mean to You? PDF (28 pp, 80 K)
• Interim Enhanced Surface Water Treatment Rule: Frequent Questions PDF (15 pp, 43 K)

Quick Reference Guides

• Interim Enhanced Surface Water Rule: A Quick Reference Guide PDF (2 pp, 65 K)
  EPA 816-F-01-011
  • For other quick reference guides visit the drinking water standards - quick reference guides page.

Guidance

• Interim Enhanced Surface Water Treatment Rule Final Implementation Guidance PDF (106 pp, 318 K) and Appendices PDF (94 pp, 776 K)

Training and Training Materials

• Training site for all MDBP rules