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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 proposed language (WAC 173-224) 03/22/23

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-224-03-22-23

Rulemaking proposed language (WAC 173-337) 12/07/22

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-337-12-07-22

Rulemaking Proposed Language (WAC 173-228) 10/04/17

This is proposed rule language for WAC 173-228 Sewage No Discharge Zones

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-228-10-04-1

Rulemaking proposed language (WAC 173-201A) 3/24/21

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-3-24-2

Rulemaking proposed language (WAC 173-400) 06/22/21

This is the proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-06-22-2

Rulemaking proposed language (WAC 173-201A) 10/18/21

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-10-18-21

Rulemaking proposed language (WAC 173-224) 03/16/21

This is proposed rule language for (WAC 173-224) Water Quality Permit Fee

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-224-03-16-2

Rulemaking proposed language (WAC 173-350) 1/23/18

This is proposed rule language for WAC 173-350 Solid Waste Handling Standards.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-350-1-23-18

Rulemaking proposed language (WAC 173-323) 10/3/17

This is proposed rule language for WAC 173-323 Grants and Loans

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-323-10-3-17

Rulemaking proposed language (WAC 173-340) 02/15/23

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-340-02-15-23

Rulemaking proposed language (WAC 173-230) 03/12/19

This is proposed rule language for WAC 173-230

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-230-03-1

Rulemaking proposed language (WAC 173-400) 09-07-22

This is proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-09-07-22

Rulemaking proposed language (WAC 173-219) Aug. 23, 2017

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-219-08-23-1

Rulemaking proposed language (WAC 173-400) 06/20/18

This is the proposed rule language for WAC 173-400, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-06-20-1

Rulemaking proposed language (WAC 173-201A) 07/18/23

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-07-18-23

ulemaking proposed language (WAC 173-201A) 5/10/24

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-5-10-24

Rulemaking proposed language (WAC 173-400) 9-18-24

This is the proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-9-18-24

Rulemaking proposed language (WAC 173-201A) 09/17/2024

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-09-17-2024

Rulemaking proposed language (WAC 173-400, sections 025, 040, 050, 060, 105)

This is the proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-sections-025-040-050-060-105-9-18-24

Rulemaking proposed language (WAC 173-339)

This is the proposed rule language for WAC 173-339.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-339-01-30-25