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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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

Rulemaking Proposal (WAC 173-201A) 01/08/15

This is a rulemaking proposal (CR-102) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-01-08-15

Rulemaking Announcment 12-03 (WAC 173-201A) 9/13/12

This is a rulemaking announcement (CR-101) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/rulemaking-announcment-12-03-wac-173-201a-9-13-1

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

Rulemaking Announcement (WAC 173-230) 06/22/18

This is a rulemaking announcement (CR-101) for WAC 173-230

https://ecology.wa.gov/rulemaking-announcement-wac-173-230-06-22-18

AO16-07 EPA Approval Tech Support Doc

This is the technical support document that goes with the EPA Approval Letter.

https://ecology.wa.gov/epa-approval-tech-support-doc

Rulemaking proposal (WAC 173-230) 03/12/19

This is a rulemaking proposal (CR-102) for WAC 173-230 Wastewater Operator Certification

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-230-03-12-1

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

Rulemaking Announcement 11-08 (WAC 173-201A) 9/13/12

This is a rulemaking announcement (CR-101) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/rulemaking-announcement-11-08-wac-173-201a-9-13

Goldendale Energy Storage Project Section 401 water quality certification

On May 22, 2023, Ecology notified Rye Development that it issued a water quality certification for the Goldendale project.

https://ecology.wa.gov/goldendale-section-401-water-quality-certification

Preliminary draft toxics language and toxics table (WAC 173-201A) 9/30/14

This is the Preliminary draft toxics language and toxics table with footnotes at WAC 173-201A-240 for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-toxics-language-and-toxics-table

VIS System for Stormwater runoff filtration

We find the VIS system functionally equivalent to a bioretention planter or planter box.

https://ecology.wa.gov/cedargrovevissystem

Rulemaking proposed language (WAC 173-230) 03/12/19

This is proposed rule language for WAC 173-230

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-230-03-1

Rulemaking Adoption Notice (WAC 173-201A) 1/23/19

This is a rulemaking adoption (CR-103) for WAC 173-201A Recreational Use Critera

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-1-23-19

Summary Changes Addendum Chapter 173-230

This is a document that summarizes the changes in the rule language to help crosswalk from the old rule language

https://ecology.wa.gov/summarychangesaddendum

Rulemaking Proposed Language for Chapter 173-201A WAC, Water Quality Standards for Surface Waters of the State of Washington

This is the proposed rule language for Chapter 173-201A WAC, Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-07-17

Stromwater Manual Handout 4

UIC guidance for the stormwater manual meeting.

https://ecology.wa.gov/swm-4

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

Preliminary draft SBEIS (WAC 173-201A) 9/30/14

This is the preliminary draft small business economic impact statement for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-sbeis-wac-173-201a-9-30-14