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 173-201A) 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 173-187) 4/17/23

This is a rulemaking announcement (CR-101) for WAC 173-187 Financial Responsibility

https://ecology.wa.gov/rulemaking-announcement-wac-173-187-4-17-23

Rulemaking Announcement (Tug Escort Rulemaking - Chapter 363-116 WAC) 02/22/23

This is a rulemaking announcement (CR-101) for Tug Escort Rulemaking (Chapter 363-116 WAC)

https://ecology.wa.gov/rulemaking-announcement-tug-escort-rulemaking-chap

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

Adopted rule language for WAC 173-186, Oil Spill Contingency Plan - Railroad 12/12/2019

Rulemaking Adoption rule language (WAC 173-186) holder text

https://ecology.wa.gov/rulemaking-adoption-rule-language-wac-173-186-ho

Rulemaking Announcement (WAC 173-166) 08/09/17

This is a rulemaking announcement (CR-101) for WAC 173-166 Emergency Drought Relief

https://ecology.wa.gov/rulemaking-announcement-wac-173-166-08-09-17

Rulemaking Announcement (WAC 173-186) 12/05/18

This is a rulemaking announcement (CR-101) for WAC 173-186 Oil spill contingency plan — railroad.

https://ecology.wa.gov/rulemaking-announcement-wac-173-186-12-05-18

Rulemaking Announcement (WAC 173-182) 01/02/19

This is a rulemaking announcement (CR-101) for WAC 173-182 Oil Spill Contingency Plan.

https://ecology.wa.gov/rulemaking-announcement-wac-173-182-01-02-19

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 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 173-201A) 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 173-03) 2/28/17

This is a rulemaking announcement (CR-101) for WAC 173-03 Public Records

https://ecology.wa.gov/rulemaking-announcement-wac-173-03-2-28-17

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 Announcement (WAC 173-180; WAC 173-184) 08/03/21

This is a rulemaking announcement (CR-101) for WAC 173-180 Facility Oil Handling Standards; WAC 173-184 Vessel Oil Transfer Advance Notice and Containment Requirements.

https://ecology.wa.gov/rulemaking-announcement-wac-173-180;-wac-173-184

Rulemaking Announcement (WAC 173-185) 01/06/20

This is a rulemaking announcement (CR-101) for WAC 173-185 WAC, Oil Movement by Rail and Pipeline Notification.

https://ecology.wa.gov/rulemaking-announcement-wac-173-185-01-06-20

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 (WAC 173-166) 11/01/23

This is a rulemaking announcement (CR-101) for WAC 173-166 Emergency Drought Relief

https://ecology.wa.gov/rulemaking-announcement-wac-173-166-11-01-23

Rulemaking Announcement ( 173-905 WAC) 3/19/24

Rulemaking Announcement CR 101

https://ecology.wa.gov/rulemaking-announcement-173-905-wac-;-3-19-24