Regulations & Permits

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

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Establishing Benthic Index of Biotic Integrity (B-IBI) Thresholds for Use in the Water Quality Assessment

This information is intended to provide rationale for the 2014 Water Quality Assessment submittal to the Environmental Protection Agency (EPA) regarding B-IBI thresholds used for assessment of B-IBI data.

https://ecology.wa.gov/wqab-ibirationale

Withdrawal Notice (WAC 173-201A) 9/11/2012

This is the withdrawn rulemaking announcement (CR 101) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/withdrawal-notice-wac-173-201a-9-11-2012

Western WA O&M Worksheet

Use this worksheet as a guide for interviewing MS4 staff and reviewing applicable documents.

https://ecology.wa.gov/western-wa-o-m-worksheet

Western WA IDDE Worksheet

Use this worksheet as a guide for interviewing MS4 staff and reviewing applicable documents.

https://ecology.wa.gov/western-wa-idde-worksheet

Workshop Agenda Nov. 14

Agenda for the Nov. 14 Workshop on PCB Variances for Spokane River Dischargers

https://ecology.wa.gov/workshop-agenda-nov-14

Winery Permit Preliminary Draft

This is the 2017 Preliminary Draft of the Winery General Permit for Washington state.

https://ecology.wa.gov/winery-permit-preliminary-draft

Winery Permit Preliminary Draft Fact Sheet

This is the fact sheet for the 2017 Preliminary Draft of the Winery General Permit for Washington state.

https://ecology.wa.gov/winery-permit-preliminary-draft-fact-sheet

Whatcom County enforcement process

TMDL enforcement process for Whatcom County and city of Bellingham

https://ecology.wa.gov/whatcomcntytmdlenforcementprocesssubmit

WQ Web Portal Step by Step Instructions

Use this step by step guide with screenshots to learn how to sign up and use the water quality web portal.

https://ecology.wa.gov/wq-web-portal-instrcutions

Ecology Water Quality Combined funding program - Fiscal Year 2020 Applicant Workshop - Facility Session

The Wasterwater Facility session for the Water Quality Combined funding cycle - Fiscal Year 2020 Applicant Workshop

https://ecology.wa.gov/wqc-fy2019-applicant-workshop-facility-session

Wetland Mod System

Ecology finds the Bio Clean Wetland Mod system is functionally equivalent to a bioretention facility when used for treating stormwater.

https://ecology.wa.gov/wetland-mod-system

Ecology Water Quality Combined funding program - Fiscal Year 2020 Applicant Workshop - Hardship Session

Hardship session for the Water Quality Combined funding program's Fiscal Year 2020 Applicant Workshop

https://ecology.wa.gov/wqc-fy2019-applicant-workshop-hardship-session

Wet Sep

Letter showing Wet Sep functional equivalence.

https://ecology.wa.gov/wetsepfunctionallyequivalent

WGHOGA letter on NPDES permit application

Burrowing shrimp document: WGHOGA letter on NPDES permit application

https://ecology.wa.gov/wghoga-letter-on-npdes-permit-application

WGHOGA Public Notice of Intent to Deny NPDES Permit letter

This document contains the letter, public notice, and description of the Intent to Deny the NPDES permit for WGHOGA

https://ecology.wa.gov/wghoga-public-notice-npdes-letter

WGHOGA transmittal letter for NPDES permit application

Burrowing shirmp document: WGHOGA transmittal letter for NPDES permit application

https://ecology.wa.gov/wghoga-transmittal-letter-for-npdes-permit-applica

2017 Annual Report for Wiegardt & Sons, Inc.

This annual report reviews Zostera Japonica controls on commercial clam beds in Willapa Bay for Wiegardt & Sons, Inc..

https://ecology.wa.gov/weigardt-3006-annual-report

2017 Annual Report for Willapa Bay Shellfish

2017 annual report for zostera japonica controls in Willapa Bay for Willapa Bay Shellfish.

https://ecology.wa.gov/willapa-3008-annual-report

2018 Pretreatment Plan Weigardt

Pretreatment plan for Zostera Japonica controls on commercial clam beds in Willapa Bay for Weigardt.

https://ecology.wa.gov/weigardt-2018-pretreatment-plan

2018 Pretreatment Plan for Willapa Bay Shellfish

Pretreatment plan for Zostera Japonica controls on commercial clam beds in Willapa Bay for Willapa Bay Shellfish.

https://ecology.wa.gov/willapa-2018-pretreatment-plan