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.
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
January 30, 2006
- January 5, 2006 Federal Register Notice
- 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.
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.
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
- Cost and Technologies
- Economic Analysis
- 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
- Stakeholder Meetings
- 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.