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.

See more about this collection...

MS4 Permit Secondary Permitee List

List of Secondary Permittee for municipal stormwater permits

https://ecology.wa.gov/ms4-permit-secondary-permitee-list

March 29 Ecology letter to interested parties

A letter outlining the history and permitting process of biosolids application at Bio Recycling's North Ranch site.

https://ecology.wa.gov/march-29-ecology-letter-to-interested-parties

Listening Session July 10 2018

Slides from the July 10, 2018 Workshop and Listening Session

https://ecology.wa.gov/listening-session-powerpoint-july-10-2018

Formal comment letter to EPA about the Clean Water Act Section 401 rule proposal

These are Ecology's official comments submitted to EPA on the proposed changes to the Clean Water Act Section 401.

https://ecology.wa.gov/oct21-epa-letter

Final MOU WSDA and Ecology 2011

This is the Memorandum of Understanding between Washington Dept. of Agriculture and Ecology. It explains roles and responsibilities of each agency.

https://ecology.wa.gov/mou-agecology-2011final

Draft Aquatic Noxious Weed Control NPDES General Permit

Aquatic Noxious Weed Control NPDES General Draft Permit.

https://ecology.wa.gov/noxiousdraftfs100511

Aquatic Noxious Weed Control NPDES General Permit

The general permit covers the indirect discharge of herbicides, adjuvants, and marker dyes into estuaries, marine areas, wetlands, along lake shorelines, rivers, streams, and other wet areas to manage Spartina and freshwater noxious weeds in Washington. An indirect discharge occurs when there may be incidental overspray or dripping of a chemical from the treated plants into waters of the state.

https://ecology.wa.gov/noxiouspermitfinal050712

Aquatic Noxious Weed Control NPDES General Permit Response to Comments

Response to Comments for the Aquatic Noxious Weed Control NPDES General Permit.

https://ecology.wa.gov/noxiousweedappendixdresponsetocomment

Willapa-Grays Harbor Oyster Growers Association v. Ecology Dismissal

This is the legal dismissal order for the Willapa-Grays Harbor Oyster Growers Association v. Ecology PCHB case

https://ecology.wa.gov/oct-2019-dissmisal-order

Fact Sheet Addendum for the Modification of the Sand and Gravel General Permit

APPENDIX B: FACT SHEET ADDENDUM SAND AND GRAVEL GENERAL PERMIT DRAFT PERMIT MODIFICATION

https://ecology.wa.gov/modificationfactsheet

Lynnwood meeting notes for MS4 permit reissuance public meeting

2/23/17: W.WA Municipal Stormwater Permit Reissuance public meeting– Lynnwood

https://ecology.wa.gov/lynnwoodmtg-notes02232017

Early input on MS4 permit reissuance from October 2016 through 2017

This is a compilation of comments from stakeholders giving early input about the reissuance.

https://ecology.wa.gov/october2016earlyinput

2018 Nisbet Pretreatment Plan

Pretreatment plan for Zostera japonica controls on commercial clam beds in Willapa Bay for Nisbet.

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

2018 Pretreatment Plan Northern Oyster

2018 pretreatment plans on control for commercial clam beds in Willapa Bay.

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

Annual Report for Long Island Oyster

Annual report reviews Zostera Japonica controls on commercial clam beds in Willapa Bay for Long Island Oyster.

https://ecology.wa.gov/long-is-3003-2017-annual-report

2017 Annual Report for Northern Oyster Co.

Annual report reviews Zostera Japonica controls on commercial clam beds in Willapa Bay for Northern Oyster Co.

https://ecology.wa.gov/northern-3007-annual-report-1

2018 Pretreatment Plan for Long Island

2018 pretreatment plans on control for commercial clam beds in Willapa Bay for Long Island.

https://ecology.wa.gov/long-island-2018-pretreatment-plan

Listening Session PowerPoint Slides for 2015 CSWGP Reissuance

2015 Construction Stormwater General Permit Reissuance Listening Session slides explain the schedule, process, and provides forum for feedback.

https://ecology.wa.gov/october2014listening

NORPAC Permit Modification

Permit modification

https://ecology.wa.gov/norpac-permit-modification-e55428bb7ee61befc29b9a79cd5be312

NORPAC Supplemental Fact Sheet

This supplemental fact sheet explains and documents the decisions the Department of Ecology (Ecology) made in drafting the proposed National Pollutant Discharge Elimination System (NPDES) permit modification for North Pacific Paper Company, LLC (NORPAC).

https://ecology.wa.gov/norpac-supplemental-fact-sheet