Microbial and Disinfection Byproduct Rules

EPA's MDBP Questions and Answers

Stage 2 MDBP

Draft Simultaneous Compliance Guidance Manual for Stage 2 Rules

The purpose of this guidance manual is to help water systems and their regulators identifyand mitigate potential simultaneous compliance issues that may arise when systems make changes to comply with the LT2ESWTR and/or the Stage 2

DBPR. The manual also lists possible ways that simultaneous compliance issues could be addressed. In addition, tools are recommended and described to help determine if potential issues may affect a given system.

EPA encourages utilities and others to submit corrections and suggestions to the manual at: stage2mdbp@epa.gov.

Initial Distribution System Evaluation Tool (IDSE Tool)

The IDSE Tool is a web-based electronic wizard designed to help water systems through the entire IDSE process. Systems first use the IDSE Wizard to determine which IDSE option is best for them. The IDSE Plan/Report Entry then creates custom forms for the selected option and guides the system step-by-step through the forms that can then be submitted electronically. The IDSE Tool is also available on CD-ROM.

State/Fed Contact List for MDBP Compliance Help

IDSE Guidance (EPA, 2.8 MB PDF, 434pp)

IDSE Guidance Erata Sheets (EPA, pdf)

Final Rule (3.1MB PDF; link to the Federal Register)

Communicating About DBPs (AMWA and AWWA) (Members Only)

LT2ESWTR

Quick Reference Guide on LT2 for Schedule 1 Systems

Fact Sheet on Monitoring for Systems Serving at Least 10,000k

LT2/Stage 2 Data Collection and Tracking System (LT2/Stage 2 DCTS)

The (DCTS) is designed to help manage data submissions and notifications associated with implementation of the LT2 and Stage 2 DBP rules. will support early implementation activities.

Laboratories can use the LT2 Data Collection System to upload E. Coli and Cryptosporidium sampling results.

PWSs can submit their sampling schedule, intent to grandfather, or intent to provide treatment as well as upload a file containing their grandfathered data through the DCTS.

Membrane Filtration Under the LT2 - Guidance Manual

Source Water Monitoring Guidance for Public Water Systems

Microbial Laboratory Guidance Manual

State/Fed Contact List for LT2 Compliance Help

Final Rule (4.5 MB PDF; link to the Federal Register)

Four Steps for a Smooth Start with Cryptosporidium Monitoring (EPA)