The Construction Stormwater eCoverage Packet outlines your responsibilities and requirements once you are covered under the Construction Stormwater General Permit (CSWGP).
We are currently in the process of switching from paper copies of this information to an electronic permit coverage packet. If you are a permittee and would like a paper copy, please contact your Permit Administrator or call the Water Quality Program front reception at 360-407-6600.
Key requirements for all permittees:
All permittees must have a Stormwater Pollution Prevention Plan (SWPPP) before disturbing the ground. Permittees must maintain the plan until the permit is terminated.
The SWPPP requirements are listed in the Construction Stormwater General Permit — S9: Stormwater Pollution Prevention Plan.
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 Construction Stormwater General Permit — S4: Monitoring Requirements, Benchmarks and Reporting Triggers.
Sites that disturb <1 acre, but part of a larger Common Plan of Development
Sites that disturb ≥1 acre but <5 acres
Sites that disturb ≥5 acres
All permittees must report sampling results electronically to us monthly by submitting Discharge Monitoring Reports (DMRs). This is required in the Construction Stormwater General Permit — S5: Reporting and Recordkeeping Requirements.
DMRs are optional for permits covering less than one acre unless 303(d)/TMDL listed and effluent limits are applicable.
DMRs must be submitted for the full duration of the CSWGP, from issuance date to termination. Failure to submit DMR(s) is a violation of your permit.
Sampling is required at all locations where stormwater leaves your site.
Regardless of the circumstances, you must submit monthly DMR(s) up until your permit coverage is officially terminated.
All permittees must report when turbidity reaches 250 Nephelometric Turbidity Units (NTU) or transparency less than or equal to 6 cm within 24 hours of analysis. Reporting can be done by telephone or electronically to the Ecology Region’s Environmental Report Tracking System (ERTS).
Submit the Notice of Termination (NOT) form when your site meets one of the following conditions:
Construction Stormwater General Permit Writer