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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NDZ supplemental letter requested by EPA

This is the letter requested of Ecology regarding the NDZ petition.

https://ecology.wa.gov/epalettervesselpumpoutavailabilityoct2016-pdf

BPC tug escort rulemaking - EIS scoping meeting presentation

EIS scoping meeting presentation for BPC tug escort rulemaking

https://ecology.wa.gov/eis-scoping-meeting-presentation

Expedited Rulemaking Proposal (WAC 173-442) 03-22-23

This is an expedited rulemaking proposal (CR-105 form) for Chapter 173-442, Clean Air Rule.

https://ecology.wa.gov/expedited-rulemaking-proposal-wac-173-442-01-23-23

Emergency Rule Adoption Language (WAC 173-03) - 7/20/17

This is emergency rule language for WAC 173-03-900E for Public Records Rule. Ecology is working on a permanent version of this language.

https://ecology.wa.gov/emergency-rule-adoption-language-wac-173-03-7

Draft Technical Standards (WAC 173-219) 02/16/17

Draft of Part IV Technical Standards for WAC 173-219 - February 16, 2017

https://ecology.wa.gov/draft-technical-standards-wac-173-219-02-16-17

Emergency Rule Adoption Notice (WAC 173-03) - 7/20/17

This is an emergency adoption of WAC 173-03-900E. Ecology is adopting a permanent version of this emergency rule.

https://ecology.wa.gov/emergency-rule-adoption-notice-wac-173-03-7-20

Expedited Rulemaking Proposal (WAC 173-422; WAC 173-422A) 01/26/21

This is an expedited rulemaking proposal (CR-105 form) for Chapters 173-422 and 173-422A, both called Motor Vehicle Emission Inspection.

https://ecology.wa.gov/expedited-rulemaking-proposal-wac-173-422;-wac-17

AO16-07 EPA Approval Letter

This is the letter from the EPA that states that the changes still follow the Clean Water Act and are approved.

https://ecology.wa.gov/epa-approval-letter

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

Economic questions (WAC 173-444) 02/07/20

These are the economic questions to consider during rule development of Chapter 173-444 WAC, Clean Energy Transformation.

https://ecology.wa.gov/economic-questions-wac-173-444-02-07-20

Draft timeline (WAC 173-446) 6-8-22

This is a draft implementation timeline for Chapter 173-446 WAC, Climate Commitment Act Program. (6/8/22 version)

https://ecology.wa.gov/draft-timeline-wac-173-446-6-8-22

Draft timeline (WAC 173-446) 01/24/22

This is a draft implementation timeline for Chapter 173-446 WAC, Climate Commitment Act Program. (1/24/22 version)

https://ecology.wa.gov/draft-timeline-wac-173-446-01-24-22

Draft work practice standard (WAC 173-400) 08/08/18

This is the draft work practice standard for sulfur recovery unit during startup and shutdown (Chapter 173-400 WAC). Western States Petroleum Association proposed this work practice standard.

https://ecology.wa.gov/draft-work-practice-standard-wac-173-400-08-08-1

Establishing small quantity emission rates (WAC 173-460) 01/16/19

This document discusses establishing small quantity emission rates in Chapter 173-460 WAC.

https://ecology.wa.gov/2019-wac406-establishingsmallquantityemissionrates

EPA SSM Policy 06/12/15

EPA's 2015 Startup, Shutdown & Malfunction Policy

https://ecology.wa.gov/epa-ssm-policy-wac-173-400;401-06-12-15

Evaluating if SQER and de minimis values should be the same (WAC 173-460) 01/17/19

This document evaluates if SQER and de minimis values should be the same in Chapter 173-460 WAC.

https://ecology.wa.gov/20190117-sqeranddeminimisvaluesshouldbethesame

Draft workload analysis (WAC 173-455; WAC 173-400) 05/24/17

This is a draft analaysis of Ecology staff workload to manage the registration program for a meeting on 05/24/17 for for WAC 173-455 Air Quality Fee Rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/meeting-handout-workload-analysis-wac-173-455;-wa

Draft Washington GREET model (WAC 173-424) 03/09/22

This spreadsheet is the draft Washington GREET model, fuel carbon intensity calculator for Clean Fuels Standards, March 9, 2022.

https://ecology.wa.gov/washington-greet-model-wac-173-424-03-09-22

EIS Scoping Presentation Slides

Slides from the EIS Scoping Presentation

https://ecology.wa.gov/eis-scoping-presentation-slides

Environmental Justice Presentation (WAC 173-446) 10-21-24

This is a presentation for the October 21, 2024 Environmental Justice listening session for Chapter 173-446 WAC, Cap-and-invest rulemaking.

https://ecology.wa.gov/presentation-wac-173-446-11-14-23-540261c1d121085d0b0e570d950387a7-1ecee0d19f94900fb988911963b64367