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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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Adopted rule language (WAC 173-182) 12/18/19

This is adopted rule language for WAC 173-182 , Oil Spill Contingency Plan.

https://ecology.wa.gov/adopted-rule-language-wac-173-182-dec

Adopted Rule Language (WAC 173-201A) 12/30/19

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

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-12-30-19

Adopted rule language (WAC 173-323) 12/18/17

This is adopted rule language for WAC 173-323 Grants and loans.

https://ecology.wa.gov/adopted-rule-language-wac-173-323-12-18-17

Adopted rule language (WAC 173-219)

This is adopted rule language for WAC 173-219 Reclaimed Water

https://ecology.wa.gov/adopted-rule-language-wac-173-219-01-23-18

Adopted Rule Language (WAC 173-224) 06/22/21

This is adopted rule language for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/adopted-rule-language-wac-173-224-06-22-21

Adopted rule language (WAC 173-201A) 09/17/21

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

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-09-17-21

Adopted rule language (WAC 173-201A) 03/22/22

This is adopted rule language for WAC 173-201A Water Quality Standards

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-03-22-22

Adopted rule language (WAC 173-230) 07/10/19

This is adopted rule language for WAC 173-230 Certification of Wastewater Operators

https://ecology.wa.gov/adopted-rule-language-wac-173-230-07-10-19

Adopted rule language (WAC 173-185) 02/02/21

This is adopted rule language for WAC 173-185 Oil Movement by Rail and Pipeline Notification

https://ecology.wa.gov/adopted-rule-language-wac-173-185-02-02-21

Adopted Rule language (WAC 173-201A) 1/23/19

This is the adopted rule language for Chapter 173-201A WAC (recreation use criteria).

https://ecology.wa.gov/ots-adopted-rule-language

Adopted rule language (WAC 173-201A) 08/01/16

This is adopted rule language for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-08-01-16

Adopted rule language (WAC 173-337) 05/31/23

This is adopted rule language for WAC 173-337 Safer Products Restrictions and Reporting

https://ecology.wa.gov/asset-collections-doc-assets-rulemaking-hwtr-wac173-337_-21-01-cr-103-adopted-rule-language-wac-173

Chapter 173-167 WAC: Emergency Drought Funding

Adopted rule language for Chapter 173-167 WAC: Emergency Drought Funding

https://ecology.wa.gov/adopted-rule-language-wac-173-167-07-24-2023

Adopted rule language (WAC 173-224) 06/29/23

This is adopted rule language for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/adopted-rule-language-wac-173-224-06-29-23

Adopted rule language (WAC 173-340) 08/23/23

This is adopted rule language for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/adopted-rule-language-wac-173-340-08-23-23

Adopted rule language (WAC 173-201A) 12/18/23

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

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-12-18-23

Adopted rule language (WAC 173-187) 6/14/24

This is adopted rule language for WAC 173-187 Financial Responsibility

https://ecology.wa.gov/adopted-rule-language-wac-173-187-6-14-24

Adopted rule language (WAC 173-201A) 08/14/24

This is adopted rule language for WAC 173-201 Water Quality Standards for Surface Waters of the State of Washington

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-08-14-24

Adopted Rule Language (WAC 173-201A) 11/14/24

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

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-11-14-24

Adopted Rule Language (WAC 173-167) 12/11/24

This is the adopted rule language for Chapter 173-167 WAC (AO 24-04)

https://ecology.wa.gov/adopted-rule-language-wac-173-167-12-11-24