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).

Links:

• Final Long Term 1 Enhanced Surface Water Treatment Rule
  67 FR 1812, January 14, 2002
  (read online) ~ (PDF)
• Fact Sheets
  • Final Long Term 1 Enhanced Surface Water Treatment Rule (815-F-02-001, January 2002)
  • Quick Reference Guide
• Long Term 1 Enhanced Surface Water Treatment Rule: A Quick Reference Guide, EPA 816-f-02-001, 2 pages, 298KB (pdf)
• Draft disinfection profile/CT spreadsheet, June 2002
  (The comment period on this document has now closed. The draft will continue to be available until it is replaced with a final version.)
• profile-benchmark-calculator.xls
• profile-benchmark-calculator-short-form.xls
• Draft Implementation Guidance
  • May 2002 Draft Implementation Guidance for the Long Term 1 Enhanced Surface Water Treatment Rule
    (The comment period on this document has now closed. The draft will continue to be available until it is replaced with a final version.)
    (All Documents in PDF Format)
    • Cover and Table of Contents
    • Sect 1: Rule Requirements
    • Sect 2: Resources & Guidance
    • Sect 3: State Implementation
    • Sect 4: State Primacy Revision Application
    • Sect 5: SDWIS Reporting & SNC Definitions
    • App A: Primacy Revision Crosswalk
    • App B: Regulatory Language
    • App C: Rule Fact Sheets
    • App C: Quick Reference Guide
    • App D: Flowcharts
    • App E: Reporting Guidance (Placeholder)
• The following guidance documents developed for the Interim Enhanced Surface Water Treatment Rule (IESWTR) may also apply to the LT1ESWTR:
  
  • Alternative Disinfectants and Oxidants Guidance Manual, EPA 815-R-99-014 /April 1999
    
  • M/DBP Simultaneous Compliance Manual, EPA-815-R-99-015 /August 1999
    
  • Guidance Manual for Conducting Sanitary Surveys of Public Water Systems; Surface Water and Ground Water Under the Direct Influence (GWUDI),
    EPA 815-R-99-016 /April 1999
    
  • Uncovered Finished Water Reservoirs Guidance Manual,
    EPA 815-R-99-011/ April 1999
    
  • Optimizing Water Treatment Plant Performance Using the Composite Correction Program
    The following handbook provides detailed information on Comprehensive Performance Evaluations (CPEs):
    EPA 625/6-91/027/August 1998
    
    • Table of Contents (PDF 154KB)
    • Chapters 1 through 8 (PDF 926 KB)
    • Appendices A through N (PDF 1.19MB)

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.

Safewater Home | About Our Office | Publications | Calendar | Links | Office of Water | En Español

EPA Home | Privacy and Security Notice | Contact Us