
	Long Term 2 Enhanced Surface Water Treatment Rule (LT2)

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Welcome to the Long Term 2 Surface Water Treatment Rule (LT2 rule) page. On this site you will find links to the rule, fact sheets as well as general information about the history of the rulemaking.

LT2 rule
Rulemaking History

LT2 Rule

The purpose of the rule is to reduce disease incidence associated with Cryptosporidium and other disease-causing microorganisms in drinking water. The rule will supplement existing regulations by targeting additional Cryptosporidium treatment requirements to higher risk systems. The rule also contains provisions to reduce risks from uncovered finished water storage facilities and to ensure that systems maintain microbial protection as they take steps to reduce the formation of disinfection byproducts. The rule will apply to all systems that use surface water or ground water under the direct influence of surface water.

The LT2 rule was published in the Federal Register on January 5, 2006.

February 6, 2006
- Correction to January 5, 2006 LT2 FR Notice
- PDF Version (57 K , 1 pg)
January 30, 2006
- Correction to January 5, 2006 LT2 FR Notice
- PDF Version (57 K , 1 pg)
January 5, 2006 Federal Register Notice
- Read Online
  - Part 1
  - Part 2
  - Part 3
- PDF Version (ALL ABOUT PDF FILES)
  - Part 1 (1 M, 50 pgs)
  - Part 2 (3 M, 50 pgs)
  - Part 3 (656 K, 34 pgs)
Fact Sheet
EPA 815-F-05-002, December 2005
This fact sheet provides information on the basic requirements, the public health and environmental benefits, and estimated costs associated with the rule.
- Read the Fact Sheet online
- PDF File (44 K, 4 pgs) (ALL ABOUT PDF FILES)

Quick Reference Guide to LT2 Rule
This document provides a simple and straight forward description of the rule, critical deadlines and requirements for drinking water systems and states, and information on monitoring requirements.

LT2 Quick Reference Guides

Questions and Answers about the LT2 rule - link back to Q&A’s on Basic Information page

LT2 Rule Supporting Documents – The following documents were developed to support the final rule-making.

Occurrence Document
- Occurrence and Exposure Assessment for the Long Term 2 Enhanced Surface Water Treatment Rule (PDF 206 pp, 2 M)
  December 2005. EPA 815-R-06-002
  - Appendices (PDF 64 pp, 5 M)
Cost and Technologies
- Technologies and Costs Document for the Final Long Term 2 Enhanced Surface Water Treatment Rule and Final Stage 2 Disinfectants and Disinfection Byproducts Rule (PDF 309 pp, 1 M)
  December, 2005. EPA 815-R-05-013
Economic Analysis
- Economic Analysis for the Long Term 2 Enhanced Surface Water Treatment Rule (PDF 319 pp, 2 M)
  December 2005. EPA 815-R-06-001
  - Appendix One (PDF 396 pp, 11 M)
  - Appendix Two (PDF 345 pp, 11 M)
For additional supporting information related to this rule-making, visit docket number EPA-HQ-OW-2002-0039 at Regulations.gov

Rule Making History

LT2 Rule Proposal
Federal Register Notice - August 11, 2003

HTML version: Part 1 Part 2 Part 3 Part 4
Fact Sheet (92 K PDF File, 2pgs) (ALL ABOUT PDF FILES)

Stakeholder Meetings
- Federal Register Notice - September 22, 2003 Meeting
Agreement in Principle
The basic framework for the rule was developed by the Stage 2 Microbial/Disinfection Byproduct federal advisory committee which was comprised of state and local government, environmental, public health and water industry stakeholders.

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