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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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

Stormwater Manual Update Agenda

Meeting agenda to help improve the manuals.

https://ecology.wa.gov/swm-agenda

Interceptor ClimaCover

Ecology finds ClimaCover Interceptor Dike is equivalent to BMP C200 Interceptor Dam. The specifications for the check dam system must adhere to the specifications listed in this letter.

https://ecology.wa.gov/climacoverinterceptordikefea

Table 602 and Table 612 with track changes (WAC 173-201A) 07/17/18

This is a supporting document showing the proposed edits to Chapter 173-201A WAC Table 602 and Table 612 in track changes.

https://ecology.wa.gov/table-602-and-table-612-with-track-changes-wac-17

Silva Cell Modeling Procedure

Report on using the Western Washington Hydrology Model (Vers. 4.0) to size Silva Cells for stormwater runoff treatment and flow control.

https://ecology.wa.gov/deeprootssilvacellmodelingprocedure

Stormwater Manual Handout

Redevelopment handout for the manual improvement meeting.

https://ecology.wa.gov/swm-handout-1

Rulemaking Adoption Notice (WAC 173-201A) 08/01/16

This is a rulemaking adoption (CR-103) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-201a-08-01-16

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

Stormwater Manual Handout 2

Flow chart for stormwater manual improvement.

https://ecology.wa.gov/swm-handout-2

Adsorb-it filtration fabric

Ecology letter finding Eco-Tec, Inc. Adsorb-it filtration fabric, when configured properly, can be used as a catch basin insert for stormwater control.

https://ecology.wa.gov/ecologyletter

Envirotac II

Letter showing Envirotac II functionally equivalent to C126 (Polyacrylamide for Soil Erosion Protection) and C140 (Dust Control) best management practices for stormwater management.

https://ecology.wa.gov/envirotac2

Stormwater Manual power point

This presentation shows intended improvements for the manual.

https://ecology.wa.gov/swm-powerpoint

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

Overview of key decisions in rule amendments (WAC 173-201A) 9/30/14

This is the overview of key decisions in rule amendments for human health criteria and implementation tools for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/overview-of-key-decisions-in-rule-amendments-wac

EarthGuard Fiber Matrix Equivalency

Ecology letter finding EarthGuard Fiber Matrix can be used as temporary erosion control mechanism.

https://ecology.wa.gov/equivalency-earthguard-bmpc120

SWMMEW Winter Newsletter 2018-19

This newsletter gives a description of the Stormwater Management Manual Update for Eastern WA and describes the major changes.

https://ecology.wa.gov/swmmew-winter-newsletter

Detalok Equivalency Letter

Letter showing Deltalok product can be used to meet Element 6 (Protect Slopes) of the Stormwater Pollution Prevention Plan for construction sites.

https://ecology.wa.gov/equivalencyletter

Ecology's Submittal Letter to EPA (WAC 173-201A) 8/01/16

This is the Ecology's Submittal Letter to EPA for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/ecology-s-submittal-letter-to-epa-wac-173-201a-8

Adopted rule language (WAC 173-201A) 08/01/16

This is adopted rule language for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/adopted-rule-language-wac-173-201a-08-01-16

Erosian Eel

Letter stating that Erosion EEL is equivalent to straw wattle for use in stormwater control.

https://ecology.wa.gov/erosioneel