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Ecology provides the high-quality science that is the foundation of Washington state environmental policy. Our monitoring, assessment, and modeling services provide a data-rich understanding of our state’s land, air, and water. We provide access to that data through reports, databases, maps and user-friendly online tools.

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Rulemaking Adoption Notice (WAC 173-186) 12/12/2019

Rulemaking Adoption Notice (CR-103) for WAC 173-186, Oil Spill Contingency Plan - Railroad.

https://ecology.wa.gov/rulemaking-adoption-wac-173-186-holder

Rulemaking adopted repeal language (WAC 173-04) 06/25/2021

This is adopted repeal rule language for WAC 173-04, Practice and Procedure

https://ecology.wa.gov/rulemaking-adopted-repeal-language-wac-173-04-06

Rulemaking Adoption Notice (WAC 173-201A) 03/22/22

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-03-22-22

Rulemaking Emergency Adoption Notice (WAC 173-167) 07/28/2021

This is an emergency rulemaking adoption (CR-103E) for WAC 173-167 Emergency Drought Funding.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-167-07-28-202

Rulemaking Adoption Notice (WAC 173-201A) 9/17/21

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-9-17-21

Rulemaking adopted repeal language strikeout version (WAC 173-04) 06/25/2021

Rulemaking adopted repeal language strikeout (WAC 173-04) 06/25/2021

https://ecology.wa.gov/rulemaking-adopted-repeal-language-strikeout-wac

Rulemaking Adoption (WAC 173-182) 12/18/19

This is a rulemaking adoption (CR-103) for WAC 173-182, Oil Spill Contingency Plan

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-182-dec

Rulemaking Adoption Notice (WAC 173-201A) 12/30/19

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-12-30-19

Rulemaking Adoption Notice (WAC 173-180; WAC 173-184) 06/06/23

This is a rulemaking adoption (CR-103) for WAC 173-180 Facility Oil Handling Standards and WAC 173-184 Vessel Oil Transfer Advance Notice and Containment Requirements

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-180;-wac-173-18

Rulemaking Adoption Notice (WAC 173-166) 04/11/2018)

This is a rulemaking adoption (CR-103) for WAC 173-166 Emergency Drought Relief

https://ecology.wa.gov/rulemaking-order-wac-173-166-04-11-2018

Rulemaking Adoption Notice (WAC 173-03) 11/15/17

This is a rulemaking adoption (CR-103) for WAC 173-03 Public Records.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-03-11-15-17

Rulemaking Adoption Notice (WAC 173-185) 02/02/21

This is a rulemaking adoption (CR-103) for WAC 173-185 Oil Movement by Rail and Pipeline Notification

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-185-02-02-21

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

Rulemaking Adoption Notice (WAC 173-201A) 08/01/16

This is a rulemaking adoption (CR-103) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-08-01-16

Rulemaking Adoption Notice (WAC 173-201A) 12/18/23

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-12-18-23

Rulemaking Adoption Notice (WAC 173-187) 6/14/24

This is a rulemaking adoption (CR-103) for WAC 173-187 Financial Responsibility

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-187-6-14-24

Rulemaking Adoption Notice (WAC 173-201A) 08/14/24

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-08-14-24

Rulemaking Adoption Notice (WAC 173-201A) 11/14/24

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-11-14-24

Rulemaking Adoption Notice (WAC 173-201A) 11/27/24

This is a rulemaking adoption (CR-103) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-2024

Rulemaking Adoption Notice (WAC 173-167) 12/11/24

This is the rulemaking adoption notice (CR-103) for Chapter 173-167 WAC (AO 24-04)

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-167-12-11-24