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Research & Data

Use this portal to filter and search for all of our scientific information.

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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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Research & Data

Use this portal to filter and search for all of our scientific information.

Research & Data icon

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 Proposal (WAC 173-201A) 10/18/21
This is a rulemaking proposal (CR-102) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-10-18-21
Rulemaking Proposal (WAC 173-201A) 3/24/21
This is a rulemaking proposal (CR-102) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-3-24-21
Rulemaking proposed language (WAC 173-201A) 02/01/16
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-02-01
Rulemaking Proposal (WAC 173-201A) 07/30/19
This is a rulemaking proposal (CR-102) for WAC 173-201A multiple revisions to WQ Standards
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-07-30-19
Rulemaking proposed language (WAC 173-201A) 01/08/15
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-01-08
Rulemaking Proposal (WAC 173-224) 03/16/21
This is a rulemaking proposal (CR-102) for WAC 173-224 Water Quality Permit Fees
https://ecology.wa.gov/rulemaking-proposal-wac-173-224-03-16-21
Rulemaking Proposal (WAC 173-201A) 02/01/16
This is a rulemaking proposal (CR-102) for WAC 173-201A Water quality standards for surface waters of the state of Washington.
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-02-01-16
Rulemaking Proposal (WAC 173-201A) 01/08/15
This is a rulemaking proposal (CR-102) for WAC 173-201A Water quality standards for surface waters of the state of Washington.
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-01-08-15
Rulemaking Announcment 12-03 (WAC 173-201A) 9/13/12
This is a rulemaking announcement (CR-101) for WAC 173-201A Water quality standards for surface waters of the state of Washington.
https://ecology.wa.gov/rulemaking-announcment-12-03-wac-173-201a-9-13-1
Rulemaking proposal (WAC 173-230) 03/12/19
This is a rulemaking proposal (CR-102) for WAC 173-230 Wastewater Operator Certification
https://ecology.wa.gov/rulemaking-proposed-language-wac-173-230-03-12-1
Rulemaking Proposed Language for Chapter 173-201A WAC, Water Quality Standards for Surface Waters of the State of Washington
This is the proposed rule language for Chapter 173-201A WAC, Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposed-language-wac-173-201a-07-17
Rulemaking proposal (WAC 173-219) Aug. 23, 2017
This is a rulemaking proposal (CR-102) for WAC 173-219 Reclaimed Water
https://ecology.wa.gov/rulemaking-proposal-wac-173-219-08-23-17
Rulemaking Proposal (WAC 173-201A) 07/18/23
This is a rulemaking proposal (CR-102) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-07-18-23
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
This is a rulemaking proposal (CR-102) for WAC 173-201A 02/15/24
This is a rulemaking proposal (CR-102) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-02-15-24
Rulemaking proposed language (WAC 173-201A) 02/15/24
This is proposed rule language for (CR-102) 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-02-15-24
Rulemaking Proposal Extension (WAC 173-201A) 03/13/24
This is a rulemaking proposal extension (CR-102 C) for WAC 173-201A 03/13/24
https://ecology.wa.gov/rulemaking-proposal-extension-wac-173-201a-03-13-24
Rulemaking Proposal (WAC 173-201A) 5/10/24
This is a rulemaking proposal (CR-102) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-5-10-24
Rulemaking Proposal Extension (WAC 173-201A) 7/11/24
This is a rulemaking proposal extension (CR-102 C) for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-extension-wac-173-201a-7-11-24
Rulemaking Proposal (WAC 173-201A) 09/17/2024
This is a rulemaking proposal (CR-102) for Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/rulemaking-proposal-wac-173-201a-09-17-2024
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