Initial Distribution System Evaluation (IDSE) Reporting
How to Complete an IDSE Report in Region 10
An Initial Distribution System Evaluation (IDSE) is used to determine where the highest levels of total trihalomethane (TTHM) and haloacetic acid (HAA5) can be found in a water system's distribution system. All water systems that have completed either a Standard Monitoring IDSE or System Specific Study IDSE 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.
Timeline for submitting IDSE reports:
Schedule* | Submit report by: | Send your report to: |
|  | |
1 | January 1, 2009 | EPA Region 10 |
2 | July 1, 2009 | EPA Region 10 |
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 Wendy Marshall (marshall.wendy@epa.gov) at 206-553-1890, or Chan Pongkhamsing (pongkhamsing.chan@epa.gov) at 206-553-1806. |
Select the type of report you plan to submit based on the type of IDSE you completed:
Prepare a Standard Monitoring IDSE Report (if your population is 10,000 or more):
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
- Submitting your report
You may use one of the options below for filling out your report (we recommend using one of the first three options):
Note: If your system is Schedule 1 or Schedule 2 and you use the IDSE Tool, please contact Wendy Marshall at (206) 553-1890 to let her know you have submitted your IDSE report using the IDSE Tool. Otherwise, please send your completed IDSE report form and schematic (if required) by email or hard copy to:
Wendy Marshall (marshall.wendy@epa.gov)
U.S. Environmental Protection Agency
1200 Sixth Avenue, Suite 900, OWW-136
Seattle, WA 98101
If your system is Schedule 3 and you want to use the IDSE Tool to submit your IDSE report, please contact your state office to find out if they will accept the IDSE report using the IDSE Tool. Otherwise, please submit your completed IDSE report directly to your state office.
Top of page
Prepare a Standard Monitoring IDSE Report (if your population is less than 10,000):
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
- Submitting your report
You may use one of the options below for filling out your report (we recommend using one of the first three options):
Note: If your system is Schedule 1 or Schedule 2 and you use the IDSE Tool, please contact Wendy Marshall at (206) 553-1890 to let her know you have submitted your IDSE report using the IDSE Tool. Otherwise, please send your completed IDSE report form and schematic (if required) by email or hard copy to:
Wendy Marshall (marshall.wendy@epa.gov)
U.S. Environmental Protection Agency
1200 Sixth Avenue, Suite 900, OWW-136
Seattle, WA 98101
If your system is Schedule 3 or Schedule 4 and you want to use the IDSE Tool to submit your IDSE report, please contact your state office to find out if they will accept the IDSE report using the IDSE Tool. Otherwise, please submit your completed IDSE report directly to your state office.
Top of page
Prepare a System Specific Study IDSE Report Using Monitoring Results
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
- Submitting your report
You may use one of the options below for filling out your report (we recommend using one of the first two options):
Note: If you use the IDSE Tool, please contact Wendy Marshall at (206) 553-1890 to let her know you have submitted your IDSE report using the IDSE Tool. Otherwise, please send your completed IDSE report form and schematic (if required) by email or hard copy to:
Wendy Marshall (marshall.wendy@epa.gov)
U.S. Environmental Protection Agency
1200 Sixth Avenue, Suite 900, OWW-136
Seattle, WA 98101
Top of page
Prepare a System Specific Study IDSE Report Using a Hydraulic Model
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
- Submit your report
You may use one of the options below for filling out your report (we recommend using one of the first two options):
Note: If you use the IDSE Tool, please contact Wendy Marshall at (206) 553-1890 to let her know you have submitted your IDSE report using the IDSE Tool. Otherwise, please send your completed IDSE report form and schematic (if required) by email or hard copy to:
Wendy Marshall (marshall.wendy@epa.gov)
U.S. Environmental Protection Agency
1200 Sixth Avenue, Suite 900, OWW-136
Seattle, WA 98101
Top of page