Construction Stormwater General Permit eCoverage Packet
The Construction Stormwater General Permit (CSWGP) is switching from a hard copy to electronic permit coverage packet.
If you are a Permittee and would like a paper copy, please email our reference mailbox
or call the Water Quality Program front reception at 360-407-6600.
Key requirements for all Permittees (Permit
Stormwater Pollution Prevention Plan (SWPPP) (S9)
All Permittees must have a SWPPP before ground disturbance and maintain the plan until the permit is terminated. The SWPPP requirements are listed in
the CSWGP - S9. Stormwater Pollution Prevention Plan.
Inspect/Monitor (S4, S5)
All Permittees must inspect the construction site and monitor water discharging from the site. Inspections must be summarized in an Inspection
Report or Checklist and kept with the Site Log Book. These requirements are listed in the CSWGP - S4. Monitoring Requirements, Benchmarks and Reporting Triggers.
Summary of Monitoring Requirements (see Table 3 in the CSWGP):
|Size of Soil Disturbance
||Weekly Site Inspections
||Weekly Sampling w/ Turbidity Meter
||Weekly Sampling w/ Transparency Tube
||Weekly pH Sampling
||CESCL Required for Inspections?
|Sites that disturb less than 1 acre, but are part of a larger Common Plan of Development
|Sites that disturb 1 acre or more, but fewer than 5 acres
||Sampling required -- either method
||Sampling required -- either method
|Sites that disturb 5 acres or more
Discharge Monitoring Reports (DMRs) (S5.B)
All Permittees must report sampling results electronically to Ecology on monthly Discharge Monitoring Reports (DMRs) as required in the CSWGP - S5.
Reporting and Recordkeeping Requirements. DMRs must be submitted for the full duration of the CSWGP, from issuance date to termination.
Sampling is required at all locations where stormwater leaves your site.
report on your monthly DMR:
- Use Reporting Code “C” for no discharge if:
- Your site does not discharge stormwater for any particular week, or for the entire month.
Sampling is not required because discharge(s) are being sent to sanitary or combined
- Sampling is not required because the site has less than one acre of land disturbance.
Sampling is not required because stormwater is infiltrated on-site.
- Sampling is discontinued at locations that drain areas that have been fully stabilized or
where you no longer have operational control.
- Use Reporting Code “X” for construction not started if construction activities have not started; therefore, sampling is not required.
- Use Reporting Code “E” for analysis not complete/not conducted/not reported if you did not take a sample for a particular month.
Regardless of the circumstances you must submit monthly DMR(s) up until your permit coverage is officially terminated.
Failure to submit DMR(s) is a violation of your CSWGP.
Exceptions: DMRs are optional for permits covering less than one acre
High Turbidity and Non-Compliance Reporting (S5.A)
All Permittees must report when turbidity reaches 250 NTU or transparency less than or equal to 6 cm within 24 hours of analysis. Reporting can be
done by telephone to the Ecology Region’s Environmental Report Tracking System (ERTS) or electronically.
High Turbidity/Low Transparency instruction sheet
- Telephone Contacts
- Southwest Region 1-360-407-6300 (Clallam, Clark, Cowlitz, Grays Harbor, Jefferson, Mason, Lewis, Pacific, Pierce, Skamania, Thurston, and Wahkiakum counties)
- Northwest Region 1-425-649-7000 (Island, King, Kitsap, San Juan, Skagit, Snohomish, and Whatcom counties)
- Central Region 1-509-575-2490 (Benton, Chelan, Douglas, Kittitas, Klickitat, Okanogan, and Yakima counties)
- Eastern Region 1-509-329-3400 (Adams, Asotin, Columbia, Ferry, Franklin, Garfield, Grant, Lincoln, Pend Oreille, Spokane, Stevens, Walla Walla, and Whitman counties)
- Electronic ERTS Report: Electronic ERTS
Terminate Coverage (S10)
Submit the Notice of Termination when your site meets one of the following conditions:
- The site has undergone final stabilization, the Permittee has removed all temporary BMPs
(except biodegradable BMPs clearly manufactured with the intention for the material to be left in place
and not interfere with maintenance or land use), and all stormwater discharges associated with construction
activity have been eliminated; OR
- All portions of the site that have not undergone final stabilization per Special Condition S10.A.1 have
been sold and/or transferred (per General Condition G9), and the Permittee no longer has operational control
of the construction activity; OR
- For residential construction only, the Permittee has completed temporary stabilization and the homeowners
have taken possession of the residences.
For prior permit versions, see our historical information page.
Sign up for our listserv to get updates.
Discharge Monitoring Reports (DMRs) are required every month (S5.B)