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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Revised Diesel Engine Exhaust Particulate Matter Health Risk Assessment Report Quincy, Washington

This report is a final health risk assessment (HRA) of diesel particles from some Quincy data centers.

https://ecology.wa.gov/20180806healthdieseldatacenter

July 2018 vapor intrusion listening session: Q&As

Questions and answers from the vapor intrusion listening session in Bellevue, July 23, 2018.

https://ecology.wa.gov/20180723vaporlisteningsessonqa

SEPA Handbook 2018

General SEPA Guidance in a download format

https://ecology.wa.gov/2018-sepa-handbook

July 2018 vapor intrusion listening session: Slides

PowerPoint slides from the vapor intrusion listening session in Bellevue, July 23, 2018.

https://ecology.wa.gov/20180723vaporlisteningsessslides

Ecology Open Data Plan 2018

Ecology's strategy for enabling public access to our business data sets, satisfy the requirements of RCW 43.105.351.

https://ecology.wa.gov/2018-open-data-plan

2018 Modified Sand & Gravel General Permit

Sand & Gravel General Permit language modified 2018.

https://ecology.wa.gov/2018-modified-sand-gravel-general-permit

Response to comments 2018

This document is the response to public comment period held on the 2018 permit modification.

https://ecology.wa.gov/2018-response-to-comments

Microsoft MWH Data Center Expansion Tier 2 letter

This is the Microsoft MWH Data Center expansion Tier 2 toxics review letter.

https://ecology.wa.gov/20180717tier2ltr

Microsoft MWH Data Center Expansion HIA Recommendation

This is the Microsoft MWH Data Center expansion Health Impact Assessment recommendation document.

https://ecology.wa.gov/201807mwh_hiarecomm

Microsoft MWH Data Center Expansion PD

This is the Microsoft MWH Data Center expansion preliminary determination.

https://ecology.wa.gov/20180607mwh_pd2

Microsoft MWH Data Center 2nd Tier HIA

This is the 2nd Tier Health Impact Assessment for the Microsoft Data Center expansion in Quincy.

https://ecology.wa.gov/20180606mwh_hia

Microsoft MWH Data Center Notice of Construction Application

This is the notice of construction application submitted by Microsoft for the MWH Data Center in Quincy.

https://ecology.wa.gov/20180606mwh_noc

2018 EWA Formal Workshops Agenda

Agenda for the 2018 Formal Workshops and Public Hearings in Eastern WA

https://ecology.wa.gov/2018-ewa-formal-workshops-agenda

2018 WWA Formal Workshops Agenda

Agenda for the 2018 Formal Workshops and Hearings in Western WA

https://ecology.wa.gov/2018-wwa-formal-workshops-agenda

Coast Pretreatment plan for 2018

Annual pretreatment plan for Zostera Japonica control on commercial clam beds in Willapa Bay.

https://ecology.wa.gov/2018-pretreatment-plan-for-coast