Research & Data

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

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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Preliminary Draft EIS (WAC 173-201A) 06/10/20

Preliminary Draft EIS for PCB Variances on the Spokane River. Chapter 173-201A WAC.

https://ecology.wa.gov/preliminary-draft-eis-wac-173-201a-06-10-20

Preliminary Draft Implementation Plan (WAC 173-201A) 06/10/20

Preliminary Draft Implementation Plan for PCB Variances on the Spokane River. Chapter 173-201A WAC.

https://ecology.wa.gov/preliminary-draft-implementation-plan-wac-173-201

Preliminary draft language (WAC 173-166) 09/01/17

This is Preliminary draft language for WAC 173-166 Emergency Drought Relief

https://ecology.wa.gov/preliminary-draft-language-173-166-wac-09-01-17

Preliminary Draft Rule Language (WAC 173-201A) 06/10/20

Preliminary draft rule language for amendments to chapter 173-201A WAC, for PCB Variances on the Spokane River.

https://ecology.wa.gov/preliminary-draft-rule-language-wac-173-201a-06

Preliminary Draft Rulemaking Language for WAC 173-50, Accreditation of Environmental Laboratories

Preliminary Draft Rulemaking Language for WAC 173.50, Accreditation of Environmental Laboratories

https://ecology.wa.gov/preliminary-draft-rulemaking-language-wac-173-50-1

Updated Preliminary Draft Rule Language for Chapter 173-50 WAC

Preliminary Draft Rulemaking Language for WAC 173.50, Accreditation of Environmental Laboratories as of Dec. 20, 2022.

https://ecology.wa.gov/preliminary-draft-rule-language-wac-173-50-12-20-2

Section 401 pre-filing meeting request form

Section 401 Water Quality Certification pre-filing meeting request form

https://ecology.wa.gov/pre-filing-meeting-form

Preliminary Decisions Presentation (WAC 173-201A)

This is a public webinar presentation about the preliminary decisions to revise water contact recreational use criteria in the surface water quality standards (WAC 173-201A).

https://ecology.wa.gov/preliminary-decisions-presentation-wac-173-201a

Preliminary Draft - Summary - UST Record Retention Periods (WAC 173-360; WAC 170-360A) 07/10/17

This table summarizes how long owners and operators of underground storage tank systems would need to retain records of various regulated activities under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/hold

Preliminary draft SBEIS (WAC 173-201A) 9/30/14

This is the preliminary draft small business economic impact statement for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-sbeis-wac-173-201a-9-30-14

Preliminary draft rule language for implementation (WAC 173-201A) 9/30/14

This is the preliminary draft rule language for implementation tools at WAC 173-020, 420, 460, and 510(4) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-rule-language-for-implementation

Preliminary Draft - Overview of Changes (WAC 173-360; WAC 173-360A) 07/10/17

This document provides a summary of the proposed changes to WAC 173-360, Underground Storage Tank (UST) Regulations, included in the preliminary draft rule.

https://ecology.wa.gov/preliminary-draft-overview-of-changes-wac-173-3

Preliminary Draft - Part 10 (Financial Responsibility) (WAC 173-360; WAC 173-360A) 07/10/17

This document includes Part 10 (financial responsibility) of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/preliminary-draft-part-10-financial-responsibil

Preliminary draft Implementation Plan (WAC 173-201A) 9/30/14

This is the preliminary draft Implementation Plan to implement rule after it is adopted for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-implementation-plan-wac-173-201a-9-30-14

Preliminary Draft - Parts 1-9 (WAC 173-360; WAC 173-360A) 07/10/17

This document includes Parts 1 through 9 of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/preliminary-draft-parts-1-9-wac-173-360;-wac-17

Preliminary Draft - Summary - Certification for UST Services (WAC 173-360; WAC 173-360A) 07/10/17

This table identifies the underground storage tank system services requiring the use of a service provider and the certification that a service provider must have to perform those services under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/preliminary-draft-summary-cert-to-perform-ust

Preliminary draft CBA and LBA (WAC 173-201A) 9/30/14

This is the preliminary draft cost benefit and least burdensome alternative analyses for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-cba-and-lba-wac-173-201a-9-30

Preliminary Draft - Summary - O&M Compliance Dates (WAC 173-360; WAC 173-360A) 07/10/17

This table summarizes operation and maintenance compliance dates under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/preliminary-draft-summary-o-m-compliance-dates

Preliminary Draft - Summary - Deferred UST Compliance Dates (WAC 173-360; WAC 173-360A) 07/10/17

This table summarizes the dates by which owners and operators of previously deferred underground storage tank (UST) systems installed on or before the effective date of the UST rule would need to comply with the requirements of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/preliminary-draft-summary-prev-deferred-compli

Preliminary Draft Rulemaking Language WAC 173-55

Draft rule language for WAC 173-55, Accreditation of Cannabis Laboratories, as of late July 2023.

https://ecology.wa.gov/preliminary-draft-rulemaking-language-wac-173-55