Our stormwater manuals provide stormwater permit implementation and management guidance. To determine which manual you need, contact your municipality or permit administrator.
Ecology is supporting and leading the effort to update the 2004 Stormwater Management Manual for Eastern Washington, as it has been over 10 years since the manual was written.
In early 2016, a steering committee comprised of Eastern Washington permittees and secondary permittees was convened. The steering committee helped to identify and set priorities for the project, as well as review proposed content changes for the manual update.
Those not on the steering committee can participate by reviewing and commenting on draft documents/language and participating in public meetings and webinars.
“Complete a focused update of the manual via an open and collaborative process to include the latest advances in stormwater management, needed clarifications, and improved ease of use.”
In some cases, municipal stormwater permittees have the option of either adopting portions of the appropriate Stormwater Manual or portions of a regional manual determined to be equivalent to the Ecology manual.