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Stage 2 Disinfection Byproduct Rule Proposal . Stage 1 Disinfection Byproducts Rule (DBPR). DBP MCLs: TTHM 80 ug/L as a running annual average (RAA) HAA5 60 ug/L as an RAA Bromate 10 ug/L as a RAA Enhanced Coagulation/Softening Treatment Technique requirement.

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stage 1 disinfection byproducts rule dbpr
Stage 1 Disinfection Byproducts Rule (DBPR)
  • DBP MCLs:
    • TTHM 80 ug/L as a running annual average (RAA)
    • HAA5 60 ug/L as an RAA
    • Bromate 10 ug/L as a RAA
  • Enhanced Coagulation/Softening Treatment Technique requirement.
stage 2 dbpr regulatory development process
Stage 2 DBPR Regulatory Development Process
  • EPA negotiated with a Federal Advisory Committee which developed recommendations
      • FACA met from 3/30/99 to 9/6/00
      • 21 members from different stakeholder groups
  • Data analysis
    • treatment and occurrence data: ICR, National Rural Water Survey, Supplemental Surveys, State data
    • Cost analysis
  • Focus of DBP health concern on reproductive & developmental health effects.
why is the stage 2 dbpr needed
Why is the Stage 2 DBPR Needed?
  • DBP reproductive & developmental health effects
    • Epidemiology studies: miscarriage, stillbirth, birth defects, low birth weight.
      • Not enough data to prove causality or estimate dose levels but epidemiological studies suggest that DBPs are likely to be reproductive toxicants under appropriate exposure conditions.
    • Toxicology studies.
      • Toxicology screening studies suggest that some DBPs may be reproductive/developmental hazard
  • DBP cancer health effect risks
  • DBP levels at some sites regularly exceed MCL
stage 2 m dbpr advisory committee recommendations
Stage 2 M-DBPR Advisory Committee Recommendations
  • Stage 2 DBPR & LT2ESWTR negotiated together.
  • Agreement in Principle signed September 2000.
    • http://www.epa.gov/fedrgstr/EPA-WATER/2000/December/Day-29/w33306.htm
  • Consensus on Stage 2 DBPR recommendations
  • Phased MCLs: locational running annual average
      • LRAA = annual average at each monitoring site
      • Phase 1: TTHM/HAA5 = 120/100 ug/L
      • Phase 2: TTHM/HAA5 = 80/60 ug/L
  • Initial distribution system evaluation (IDSE) to find new compliance monitoring sites at points with highest DBP levels.
  • System compliance schedules
basis for lraa idse
Basis for LRAA & IDSE
  • Intent of rule is to focus on DBP peaks
  • Peaks in DBP levels in distribution system when compliance based on RAA.
    • Populations in different parts of the distribution system will receive equitable health protection.
  • Do Stage 1 DBPR compliance sites capture the highest DBPs in the distribution system?
  • Maximum residence time locations do not always capture highest DBP occurrence.
    • TTHM & HAA5 highest levels often occur in different places.
who is required to comply with the stage 2 dbpr
Who is Required to Comply with the Stage 2 DBPR?
  • Community and nontransient noncommunity water systems that add a primary or residual disinfectant other than ultraviolet light or deliver water that has been treated with a primary or residual disinfectant other than ultraviolet light.
system compliance requirements
System Compliance Requirements
  • Stage 2 DBPR is very similar to Stage 1 DBPR
  • Change in compliance calculation from RAA to LRAA
    • Routine monitoring on same schedule
      • Some systems will monitor at one extra site.
      • new sites determined by IDSE
    • Same type of reduced monitoring provisions for systems with low DBPs
  • IDSE
    • Monitoring for 1 year or site-specific data study
    • Opportunities for waivers and monitoring outs
  • Small systems consecutive to large systems are required to comply on the same schedule as the larger system.
idse monitoring requirements
IDSE Monitoring Requirements
  • Guidance for states and systems on how to select IDSE monitoring sites.
  • Draft guidance manual will be available at the time of proposal for recommendations from states and systems.
phased mcl requirements
Phased MCL Requirements
  • Phase 1 (monitor at Stage 1 DBPR sites)
    • TTHM MCL = 120 ug/L as a LRAA
    • HAA5 MCL = 100 ug/L as a LRAA
    • Systems must continue to comply with Stage 1 DBPR RAA 80/60 ug/L MCLs
  • Phase 2 (monitor at new sites selected from IDSE)
    • TTHM MCL = 80 ug/L as a LRAA
    • HAA5 MCL = 60 ug/L as a LRAA
    • Systems must monitor approximately every 90 days
routine monitoring requirements
Routine Monitoring Requirements

* Sys 500-9,999: State may determine that highest HAA5 & highest TTHM are at same location.

** Sys <500: State may determine that highest HAA5 & highest TTHM are at different locations.

epa rule development schedule
EPA Rule Development Schedule
  • Draft Guidance Manual for IDSE at Proposal
  • Proposal Late 2001
  • Final Rule Statutory Deadline May 2002
  • Consistent with statutory requirements for risk balancing, EPA will finalize a Long Term 2 Enhanced Surface Water Treatment Rule along with the Stage 2 Disinfectants and Disinfection Byproducts Rule, to ensure a proper balance between microbial and disinfection byproduct risks (Section 1412(b)(5)).