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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7Q10 for High Flows on the Columbia/Snake Rivers

Guidelines for arriving at 7Q10 for dissolved gas standards.

https://ecology.wa.gov/7q10forhighflows

Biosolids Report Instructions FAQ

These are instructions for biosolids managers in Washington for submitting their facility's annual report.

https://ecology.wa.gov/biosolids-report-instructions-faq

Masonry heaters that meet Washington standards, October 10, 2016

This is the October 10, 2016 list of masonry heaters that meet Washington standards.

https://ecology.wa.gov/20161010masonryheaters

Areas affected by nitrogen oxides emissions in Washington

Map of nitrogen oxides emissions from diesel Volkswagen (VW) vehicles in Washington

https://ecology.wa.gov/2017vwdieselnox

Fireplaces Certified in Washington

List of fireplaces that meet Washington standards

https://ecology.wa.gov/wood-fireplaces

Volkswagen (VW) Nitrogen Oxides Emissions in Washington-alt

The text version of the map where the nitrogen oxides emissions can be found in Washington.

https://ecology.wa.gov/2017vwnitrogenoxideemissions-alt

2017 affected Volkswagen (VW) registered vehicles in Washington

Top Washington counties with registered 2.0 and 3.0 liter diesel Volkswagen (VW) vehicles

https://ecology.wa.gov/2017vwregisteredcars

Pacific Northwest Volkswagen (VW) Zero-Emissions Vehicle (ZEV) Investment Proposal

Investment proposal for Pacific Northwest Volkswagen (VW) Zero-Emissions Vehicle (ZEV)

https://ecology.wa.gov/20161223pnwzevinvestmentproposal

Volkswagen (VW) Notice of Penalty - State

State Notice of Penalty for Volkswagen (VW)

https://ecology.wa.gov/07082016vwnoticeofpenalty-state

2015 changes to 2009 vapor intrusion toxicity values and screening levels

2015 Excel spreadsheet of changes to the 2009 vapor intrusion toxicity values and screening levels.

https://ecology.wa.gov/2015vaporintrusionupdates

Adopted rule language (WAC 173-566) 06/25/2019

This is adopted rule language for WAC 173-566 Streamflow Restoration Funding

https://ecology.wa.gov/adopted-rule-language-wac-173-566-06-25-2019

Appeal Decisions

Summary of selected Washington appellate court decisions related to shorelines.

https://ecology.wa.gov/appeal-decisions

Reporting BMPs and Load Reductions guidance for 319 and Centennial projects

BMP and Load Reduction Reporting PowerPoint Presentation

https://ecology.wa.gov/bmp-and-load-reduction-reporting-2017

Municipal Stormwater permit Annual report Walk-through

Municipal Stormwater permit step-by-step guidance for submitting your annual report.

https://ecology.wa.gov/annualreportwalkthrough_2017

Attachment 1-I - Effluent characterization requirements

Effluent characterization requirements for industrial NPDES permit applications

https://ecology.wa.gov/att1-ind_per_app

Stormwater Control Transfer Program second draft comments

Ecology is issuing this second draft guidance in concert with a companion draft guidance, Building Cities in the Rain, being issued by the Department of Commerce

https://ecology.wa.gov/2nd-draft-comments

Fireplaces that meet Washington standards, February 2023

This is the February 2023 list of fireplaces that meet Washington standards.

https://ecology.wa.gov/202302fireplaces

Wood-fired hydronic heaters that meet Washington standards, April 22, 2025

This is the April 22, 2025 list of wood-fired hydronic heaters that meet Washington standards.

https://ecology.wa.gov/20250422hydronicheaters

Wood-fired furnaces that meet Washington standards, August 19, 2022

This is the August 19, 2022 list of wood-fired furnaces that meet Washington standards.

https://ecology.wa.gov/20220819woodfurnaces