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Initial Distribution System Evaluation (IDSE) Reporting

How to Complete an IDSE Report in Region 7

An Initial Distribution System Evaluation (IDSE) is used to determine where the highest levels of total trihalomethanes (TTHM) and haloacetic acids (HAA5) can be found in a water system's distribution system. All water systems that have conducted standard monitoring or completed a system specific study must prepare and submit an IDSE Report under the Stage 2 Disinfectants and Disinfection Byproducts Rule (DBPR). The IDSE Report includes the TTHM and HAA5 monitoring results from samples collected during the evaluation period and identifies monitoring locations to be used for future compliance monitoring.

Systems conduct and report their IDSE according to their schedule:

System that serves a population, or purchases from a system that serves a population: Schedule 1 > 100,000 population
Schedule 2 50,000 – 99,999
Schedule 3 10,000 – 49,999
Schedule 4 < 10,000

Milestones for submitting IDSE Reports:

Schedule*
 Submit report by: Send your report to:

1
 January 1, 2009 EPA Region 7
2
 July 1, 2009 EPA Region 7
3
 January 1, 2010 State office
4
 July 1, 2010 State office

*If you are not sure whether your water system is Schedule 1, 2, 3 or 4, please contact Doug Brune (brune.doug@epa.gov) at 913-551-7178.

Select the type of report you plan to submit based on the type of IDSE you completed:

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Prepare a Standard Monitoring IDSE Report (if your system serves a population of at least 10,000):

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Prepare a Standard Monitoring IDSE Report (if your system serves a population less than 10,000):

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Prepare a System Specific Study IDSE Report Using Existing Monitoring Results

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Prepare a System Specific Study IDSE Report Using a Hydraulic Model

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