Regulations & Permits

Use this portal to filter and search for all of our regulatory information.

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Ecology Listening Session: Implementation Memo No. 22 - Vapor Intrusion Investigations and Short-term Trichloroethene Toxicity

This presentation was for the December 17, 2018 Ecology Listening Session in Bellevue, Washington. Ecology gathered feedback on the Implementation Memo No. 22.

https://ecology.wa.gov/december-2018-listening-session-ppt-vi-and-tce

Summary of Ecology Listening Session December 2018. Feedback on Draft Implementation Memo No. 22: Vapor Intrusion (VI) Investigations and Short-term Trichloroethene (TCE) Toxicity

This summary of the December 2018 Ecology Listening Session provides feedback on participant questions regarding Draft Implementation Memo No. 22.

https://ecology.wa.gov/summary-of-ecology-listening-session-december-2018

Richland Public Meeting Handout 2

Summary of changes handout for Richland Public Meeting

https://ecology.wa.gov/e-wa-richland-public-meeting-handout-2

Baffle Funtional Equivenlancy Letter

Letter showing Baffles are functionally equivenant.

https://ecology.wa.gov/aflbafflefel

Approval Letter

Letter showing Brentwood StormTank for is approved for use in stormwater runoff filtration.

https://ecology.wa.gov/approvalletter

Richland Public Meeting Agenda

Public Meeting Agenda for Stormwater Manual Update

https://ecology.wa.gov/ewa-manual-public-meeting-agenda-6-26-18

BioMod for Stormwater Runoff Filtration

A letter from Ecology stating this technology is equivalent to a bioretention planter box.

https://ecology.wa.gov/biomod

Richland Public Meeting Parking Map

Map of parking area for public meeting

https://ecology.wa.gov/ewa-manual-public-meeting-parking-map

Silt Fence BMP

Best managment practice for Silt Fence.

https://ecology.wa.gov/bmpc233siltfencefe

Eastern WA Manual Update Spring Newsletter

Spring 2018 Newsletter on the EWA Manual Update

https://ecology.wa.gov/ewa-manual-spring-newsletter

Webinar Presentation July 10 2018

Presentation slides for July 10, 2018 Webinar

https://ecology.wa.gov/ewa-public-meeting-webinar-slides-7-10-18

BMP Supplies Spring Berm

This letter determines that the Best Management Practices Supplies Spring Berm is functionally equivalent to the C207 (Check Dam) and C208 (Triangular Silt Dike) Best Management Practices.

https://ecology.wa.gov/bmpsupplies

Brentwood StormTank Modeling

Modeling report using the Western Washington Hydrology Model to size Brentwood StormTank for stormwater runoff and flow control.

https://ecology.wa.gov/brentwood-stormtankmodelingwwhm

Summary of Changes

Summary of Changes to the 2018 EWA Stormwater Manual

https://ecology.wa.gov/ewa-webinar-summary-of-changes-7-10-18

Summary of WWHM2012 updates

This is a summary of all of the updates to the 2012 model from the WWHM3

https://ecology.wa.gov/summary-of-wwhm2012-updates

Stormwater Manual Handout 3

Best Management Practices handout for the stormwater management manual meetings.

https://ecology.wa.gov/swm-3

Clima Cover

Letter verifying that ClimaCover All Weather Protective Systems can be used as an alternative to sandbags in stormwater control.

https://ecology.wa.gov/climacover

Stormwater Manual Update Agenda

Meeting agenda to help improve the manuals.

https://ecology.wa.gov/swm-agenda

Interceptor ClimaCover

Ecology finds ClimaCover Interceptor Dike is equivalent to BMP C200 Interceptor Dam. The specifications for the check dam system must adhere to the specifications listed in this letter.

https://ecology.wa.gov/climacoverinterceptordikefea

Silva Cell Modeling Procedure

Report on using the Western Washington Hydrology Model (Vers. 4.0) to size Silva Cells for stormwater runoff treatment and flow control.

https://ecology.wa.gov/deeprootssilvacellmodelingprocedure