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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2011 MTCATPH Excel Spreadsheet's Troubleshooting Guide

Troubleshooting guide with operating tips for common installation problems associated with compatibility with MS EXCEL 2000, 2003, 2007, 2010 versions.

https://ecology.wa.gov/2011mtcatphtroubleshooting

Adopted Rule - Crosswalk with Repealed Rule and Federal Rule (WAC 173-360; WAC 173-360A) 07/17/18

This document provides a crosswalk between the provisions in the new Underground Storage Tank Rule and the provisions in both the repealed rule and the federal rule.

https://ecology.wa.gov/adopted-rule-crosswalk-with-repealed-rule-and-fede

Adopted Rule - Overview of Changes to Repealed Rule (WAC 173-360; WAC 173-360A) 07/17/18

This document provides a summary of changes to the repealed chapter, WAC 173-360. Changes highlighted grey were made to be consistent with federal rule requirements in 40 C.F.R. Part 280 or to comply with state program approval (SPA) requirements in 40 C.F.R. Part 281.

https://ecology.wa.gov/adopted-rule-overview-of-changes-to-repealed-rule

2021 Brownfield Redevelopment Trust Fund Account report

A legislative report in response to requirements of Washington's environmental cleanup law, the Model Toxics Control Act.

https://ecology.wa.gov/2021-brownfield-redevelopment-trust-fund-account-legislative-report

2023 PPG Awards

This is Ecology's list of 2023 – 2025 Public Participation Grants awards.

https://ecology.wa.gov/2023-awards

2019 Brownfield Redevelopment Trust Fund Account

Ecology's 2019 report to the legislature on redevelopment activities funded by the Brownfield Redevelopment Trust Fund (BRTF) Account.

https://ecology.wa.gov/2019-brownfield-redevelopment-trust-fund-account-legislative-report

2023 Brownfield Redevelopment Trust Fund Account

Report to the legislature on activities funded by the Brownfield Redevelopment Trust Fund Account.

https://ecology.wa.gov/2023-brownfield-redevelopment-trust-fund-account-legislative-report

Property inspection checklist

Before buying property, use the property inspection checklist to complete an onsite inspection.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups/property-inspection-checklist

CLARC data tables and other technical information

Download CLARC data tables for information that helps site managers determine cleanup levels.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-cleanup-tools/clarc/data-tables

Eagle US 2, Longview

We regulate water and hazardous waste at the Axiall Corporation's Eagle US 2 plant in Longview.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/eagle-us-2-llc

Pacific Functional Fluids

We regulate wastewater and hazardous waste activities at Pacific Functional Fluids in Tacoma.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/pacific-functional-fluids

Northwest Alloys, Longview

We regulate water, hazardous waste and cleanup activities at Northwest Alloys in Longview.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/northwest-alloys-longview

Chapter 173-360A WAC

This is the rulemaking page for Chapter 173-360A WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-360a

Policies and guidance for site cleanups

Policies and guidance interpret the MTCA cleanup law and help you clean up contaminated sites.

https://ecology.wa.gov/regulations-permits/plans-policies/toxics-cleanup-policies

What to do if you spill oil or hazardous substances

Spills to water must be reported immediately to help reduce impacts to the environment.

https://ecology.wa.gov/regulations-permits/reporting-requirements/spills-if-you-spill

Technical resources for sediment cleanups

Access our technical resources to help support your sediment cleanup decisions.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/sediment-cleanup-resources

Contaminated Site Register & cleanup data

Get information on contaminated site cleanups through our newsletter and database.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/site-register-lists-and-data

Terrestrial Ecological Evaluations

Terrestrial Ecological Evaluations (TEEs) identify and protect native plants and animals at sites.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/terrestrial-ecological-evaluation

Hasa, Longview

We regulate water and hazardous waste activities at the Hasa bleach repackaging plant in Longview.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/hasa

Cleaning up contamination with model remedies

Model remedies are ways to clean up routine, low-risk contaminated sites under MTCA.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/mtca-model-remedies