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Stage  2 DBPR
IDSE  40/30  Certification  and Very
Small  System  Waiver Factsheet
WHAT Is THE STAGE 2 DBPR?
The U.S. Environmental Protection Agency (EPA) published the Stage 2 Disinfectants and Disinfection
Byproducts Rule (Stage 2 DBPR) on January 4, 2006. The Stage 2 DBPR builds on existing regulations by
requiring water systems to meet disinfection byproduct (DBP) maximum contaminant levels (MCLs) at
each monitoring site in the distribution system to better protect public health.


WHAT Is THE IDSE PROVISION OF THE STAGE 2 DBPR?	


The Stage  2 DBPR includes a provision requiring all community water systems (CWS) and only
nontransient noncommunity water systems (NTNCWS) serving more than 10,000 people to conduct an
initial distribution system evaluation (IDSE). NTNCWS serving less than 10,000 are exempted from IDSE
requirements, but will need to comply with the Stage 2 DBPR compliance monitoring requirements.
The goal of the IDSE is to characterize the distribution system and identify monitoring sites where
customers may be exposed to high levels of total trihalomethanes (TTHM) and haloacetic acids (HAAS).
There are  four ways to comply with the IDSE requirements: Standard Monitoring, System Specific
Study, 40/30 Certification (40/30), and Very Small System (VSS) Waiver. The 40/30 and the VSS Waiver
allows a system to comply with the IDSE requirement without having to conduct additional distribution
system monitoring. This factsheet provides information regarding 40/30 and VSS Waiver eligibility
criteria and requirements.
    Eligibility Criteria for 40/30 Certification 8t Very Small System Waiver

         40/30 Certification
  To be eligible for a 40/30, the system must
  meet all of the following requirements for
  eight consecutive quarters, as dictated by
  its Schedule*:

    n Collected all required Stage 1 DBPR
      samples.

    • No individual TTHM samples exceeded
      0.040 mg/L and no individual HAAS
      samples exceeded 0.030 mg/L.

    • The system has not had any TTHM or
      HAAS monitoring violations.
  * Eligibility & Compliance Dates for 40/30 are found in
  Table 1.
                                  Very Small System Waiver
                               To be eligible for a VSS Waiver, the system
                               must meet all of the following
                               requirements:

                                 n System serves less than 500 people.

                                 • System has collected eligible TTHM &
                                   HAAS data.

                               VSS eligibility does not depend on TTHM
                               and HAAS sample results. Samples do not
                               need to be below any particular level for
                               the system to receive the VSS Waiver.

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IF I MEET THE ELIGIBILITY CRITERIA, How Do I APPLY FOR A 40/30?
Submit Electronically:
    Go To: www.epa.gov/safewater/disinfection/tools and
    access the IDSE Tool, Plan/Report Entry.
    Create a custom 40/30 Certification Letter.
    Attach additional information if required.*
    Submit by the Due Date presented in Table 1 (below).
    Keep the confirmation number and a copy of your 40/30
    Certification Letter for your files.
Submit By Mail:
    Create a 40/30 Certification Letter. A 40/30 Certification
    template can be found in the IDSE Guidance Manual.
    Attach additional information, if required.*
    Mail submission to the IPMC:
       US EPA-IPMC
       PO Box 98
       Dayton, OH 45401 -0098
*EPA or the state may require a
system to submit the following
additional information with the
40/30 submission:

«  Stage 1 DBPR Compliance
   Monitoring Data
1  Distribution System Schematic
*J  Proposed Stage 2 DBPR
   Compliance Monitoring
   locations

Systems are encouraged to check
with EPA or the state to determine
if they need to submit any
additional information.
                          Table 1: 40/30 Criteria Compliance Dates
If you are a system serving: Schedule:1 Date Eligibility:
At least 100,000 people or part of a
combined distribution system serving at
least 100,000 people
50,000 to 99,999 people or part of a
combined distribution system serving
50,000 to 99,999 people
10,000 to 49,999 people or part of a
combined distribution system serving
10,000 to 49,999 people
Less than 10,000 or part of a combined
distribution system serving less than
10,000
Schedule 1
Schedule 2
Schedule 3
Schedule 4
Eight Consecutive Quarters
Starting No Earlier than January
2004
Eight Consecutive Quarters
Starting No Earlier than January
2004
Eight Consecutive Quarters
Starting No Earlier than January
2005
Eight Consecutive Quarters
Starting No Earlier than January
2005
40/30 Due Date:
October 1 , 2006
April 1 , 2007
October 1 , 2007
April 1 , 2008
1 Your schedule is defined by the largest system in your combined distribution system.

WHAT IF I HAVE OPERATIONAL DATA BUT No STAGE 1 DBPR COMPLIANCE DATA?
Systems that have not conducted compliance monitoring under the Stage 1 DBPR but have TTHM and
HAAS operational data should contact EPA or the state to determine if the data is sufficient to qualify
for the 40/30 or VSS Waiver. The operational data must have been:

   •  Analyzed by an EPA-approved method
   •  Analyzed by a certified laboratory
   fl  Collected in areas representative of the Maximum Residence Time
   •  Collected during the month of warmest water temperature

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WHAT DOES IT MEAN To RECEIVE AN APPROVED 40/30 OR VSS WAIVER?	

An approved 40/30 or VSS Waiver satisfies the IDSE requirement of the Stage 2 DBPR without requiring
additional monitoring. However, a system with an approved 40/30 or VSS Waiver will need to submit a
Stage 2 DBPR compliance monitoring plan and will need to start Stage 2  DBPR compliance monitoring,
as indicated by the rule, based on its Schedule.

IF I MEET THE ELIGIBILITY CRITERIA, HOW DO I APPLY FOR A VSS WAIVER?

Systems that meet the VSS Waiver eligibility criteria automatically qualify for the VSS Waiver, unless
they are contacted by EPA or the state and  informed that they must complete Standard Monitoring or
System Specific Study.

WHEN WILL I  KNOW IF MY 40/30  OR VSS WAIVER HAS BEEN APPROVED?
              40/30 Approval:

 EPA and the state are not required to send a
 confirmation that a 40/30 certification has been
 accepted. If EPA or the state does not contact
 you within a year after the 40/30 submission
 deadline (see Table 1), you may assume the
 40/30 certification has been accepted.
 Otherwise, EPA or the state will inform you that
 you must conduct Standard Monitoring or System
 Specific Study.
           VSS Waiver Approval:

EPA and the state are not required to send a
confirmation that a VSS Waiver has been approved.
EPA or the state will contact those systems required
to conduct Standard Monitoring or System Specific
Study. For systems serving less than 500 people,
standard monitoring consists of preparing a
monitoring plan, collecting TTHM/HAA5 samples at
two locations in the distribution system and
completing  an IDSE Report (see the IDSE Guidance
Manual for more information at
www.epa.gov/safewater/disinfection/stage2).
NEXT STEPS
If your system meets the 40/30 or VSS WAIVER criteria and EPA or the state does not notify you that
you need to conduct Standard Monitoring or System Specific Study, your system has satisfied the IDSE
requirements. However, your system will still need to prepare a compliance monitoring plan for Stage
2 DBPR.  This plan must be completed before your system is required to begin Stage 2 DBPR compliance
monitoring. Your system will need to continue monitoring under Stage 1 DBPR until Stage 2 DBPR
compliance monitoring begins (see Table 2).

                         Table 2: Stage 2 DBPR Compliance Monitoring
If you are on IDSE Schedule:1 You must begin Stage 2 DBPR monitoring:
Schedule 1
Schedule 2
Schedule 3
Schedule 4
April 1, 2012
October 1, 2012
October 1, 2013
October 1 , 201 3 if no Cryptosporidium monitoring required under LT2ESWTR.
OR
October 1, 2014 if Cryptosporidium monitoring is required under LT2ESWTR.
1 Schedule for systems in a combined distribution system is based on that of the largest system in the combined distribution
system.

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ADDITIONAL GUIDANCE MATERIALS
The following guidance materials address the IDSE requirements for the Stage 2 DBPR:

   •  Initial Distribution System Evaluation Guidance Manual for the Final Stage 2 Disinfectants and
       Disinfection Byproducts Rule (EPA 815-B-06-002) - This manual is a comprehensive technical
       guidance document about all IDSE options, for all system sizes and types.

   •  Initial Distribution System Evaluation Guide for Systems Serving <  10,000 People For the Final
       Stage 2 Disinfectants and Disinfection Byproducts Rule (EPA 815-B-06-001) - This manual
       focuses on information that systems serving less than 10,000 are most likely to use. It does not
       discuss the IDSE system specific study option.

   •  IDSE Tool - Is a web-based tool that walks the user through the IDSE process. A Wizard
       determines IDSE requirements and selects the best IDSE option for your system. The tool
       creates Custom Forms your system (based on population served and system type) can  submit
       electronically to EPA's Information Processing and Management Center for EPA/state review.
       (Available on-line atwww.epa.gov/safewater/disinfection/tools.)

For additional guidance on the Stage 2  DBPR, you may  refer to the following existing and future EPA
materials:

   •  Stage 2 DBPR Quick Reference Guides (Schedules 1-4).

   •  Simultaneous Compliance Guidance Manuals for the Stage 2 Rules (draft version anticipated
       mid-2006).

   •  Stage 2 Disinfectant and Disinfection Byproducts Rule:  Small Entity Compliance Guide - One of
       the Simple Tools for Effective Performance (STEP) Guide Series (draft version anticipated late
       2006).

   •  Consecutive System Guidance Manual for the Final Stage 2 Disinfectants and Disinfection
       Byproducts Rule (draft version anticipated late  2006).

   •  Operational Evaluation Guidance Manual for the Final Stage 2 Disinfectants and Disinfection
       Byproducts Rule (draft version anticipated late  2006).

Materials can be downloaded from www.epa.gov/safewater/disinfection/stage2, as they become
available.
For additional information, please contact the Safe Drinking Water Hotline at 1-800-426-4791,
send an email to stage2mdbp@epa.gov, or visit www.epa.gov/safewater/disinfection/stage2.
Office of Water (4606)       EPA 816-F-06-023         www.epa.gov/safewater/d1s1nfect1on/stage2       June 2006

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