Research & Data

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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 Announcement (WAC 173-224) 06/07/22

This is a rulemaking announcement (CR-101) for WAC 173-224 Water Quality Permit Fees..

https://ecology.wa.gov/rulemaking-announcement-wac-173-224-06-07-22

Rulemaking Announcement (WAC 173-201A) 06/22/22

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-announcement-wac-173-201a-06-22-22

Rulemaking Announcement (WAC 173-201A) 08/30/22

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-announcement-wac-173-201a-08-30-22

Rulemaking Announcement (WAC 173-201A) 09/27/22

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-announcement-wac-173-201a-09-27-22

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 Adoption Notice (WAC 173-224) 06/22/21

This is a rulemaking adoption (CR-103) for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-224-06-01-21

Rulemaking Announcement (WAC 173-201A) 12/02/19

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-announcement-wac-173-201a-12-02-19

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 Announcement (WAC 173-201A) 10/27/20

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-announcement-wac-173-201a-10-27-20

Rulemaking Announcement (WAC 173-224) 11/09/20

This is a rulemaking announcement (CR-101) for WAC 173-224 Water Quality Fees

https://ecology.wa.gov/rulemaking-announcement-wac-173-224-11-09-20

Rulemaking Announcement (WAC 173-201A) 05/08/19

This is a rulemaking announcement (CR-101) for WAC 173-201A

https://ecology.wa.gov/rulemaking-announcement-wac-173-201a-05-08-19

Rulemaking Announcement (WAC 173-201A) 06/12/19

This is a rulemaking announcement (CR-101) for WAC 173-201A Variances

https://ecology.wa.gov/rulemaking-announcement-wac-173-201a-06-12-19

Rulemaking Adoption Notice (WAC 173-230) 07/10/19

This is a rulemaking adoption (CR-103) for WAC 173-230 Certification of Wastewater Operators

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-230-07-10-19

Rulemaking Announcement (WAC 173-230) 06/22/18

This is a rulemaking announcement (CR-101) for WAC 173-230

https://ecology.wa.gov/rulemaking-announcement-wac-173-230-06-22-18

Rulemaking Announcement 11-08 (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-announcement-11-08-wac-173-201a-9-13

Rulemaking Announcement (WAC 173-201A) 10/25/11

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/wac173-201a_-16-07

Rulemaking Announcement (WAC 173-219) June 4, 2014

This is a rulemaking announcement (CR-101) for WAC 173-219 Reclaimed Water

https://ecology.wa.gov/rulemaking-announcement-wac-173-219-06-04-14

Rulemaking Announcement withdrawal (WAC 173-219) November 2006

This is a rulemaking withdrawal for WAC 173-219 Reclaimed Water

https://ecology.wa.gov/rulemaking-announcement-withdrawal-wac-173-219-0

Rulemaking Adoption Notice (WAC 173-224) 06/29/23

This is a rulemaking adoption (CR-103) for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-224-06-29-23

Water Quality Fees Rulemaking Announcement

This is a rulemaking announcement (CR-101) for WAC 173-224 Water Quality Permit Fees..

https://ecology.wa.gov/rulemaking-announcement-wac-173-224-8-7-2024