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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Table of ASIL, SQER, and de minimis emission values – WAC 173-460-150 (Effective 12-23-2019)

This is the 12/23/19 sortable table of toxic air pollutants (TAPs) listed in Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/table-of-asil-sqer-and-de-minimis-emission-value

CyrusOne Data Center Approval Order 19AQ-E052

This is the air quality approval order No. 19AQ-E052 for the CyrusOne Data Center in Quincy.

https://ecology.wa.gov/20191023cyrusoneao19aqe052

Oath Approval Order No. 19AQ-E048

This is the 2019 air quality approval order for Oath Holdings in Quincy.

https://ecology.wa.gov/20190730oath19aq-e048

Vantage Data Center approval order 19AQ-E026

This is the approval order, technical support document, and response to comments for Vantage Data Center in 2019.

https://ecology.wa.gov/20190710vantagedatacenter19aqe026

Microsoft MWH Data Center Approval Order No. 20AQ-E005

This is the air quality permit No. 20AQ-E005 for Microsoft MWH Data Center in Quincy.

https://ecology.wa.gov/20200227mwhao20aqe005

Microsoft Columbia Approval Order No. 20AQ-E002

This is the air quality approval order 20AQ-E002 for Microsoft Columbia data center in Quincy.

https://ecology.wa.gov/20200206microsoftcolumbia20aqe002

Microsoft Columbia 2019 NOC Application

This is the 2019 air quality notice of construction application for Microsoft Columbia in Quincy

https://ecology.wa.gov/20191206microsoftcolumbianocapp

Microsoft Columbia C06, Quincy, Preliminary Determination

This is the preliminary determination for the Microsoft Columbia expansion, C06.

https://ecology.wa.gov/20191209mscolumbiapd

Microsoft Columbia C06, Quincy, NOC Application

This is the notice of construction application for Microsoft Columbia's C06 expansion

https://ecology.wa.gov/20191206mscolumbianocappc06

Microsoft MWH Data Center Approval Order & TSD 19AQ-E031

This is the 2019 approval order and technical support document for Microsoft MWH Data Center.

https://ecology.wa.gov/20190926microsoftmwhaotsd19aqe031

Microsoft MWH FAQ Sheet

This is the general information and FAQ sheet for Microsoft MWH's 2018 permit revision.

https://ecology.wa.gov/20190601mwhfaqsheet

Sabey Data Center 2020 NOC App

This is the 2020 Notice of Construction Application for Sabey Data Center in Quincy

https://ecology.wa.gov/20200413sabeynocapp

Sabey Data Center 2020 Trinity HIA

This is the 2020 Health Impact Assessment by Trinity Consultants for Sabey Data Center in Quincy.

https://ecology.wa.gov/20200403sabeyhiatrinity