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...

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

Washington Department of Information Services Data Center - Technical Support Document for Health Impact Assessment

Technical Support Document for Health Impact Assessment (Second Tier Review) for Washington Department of Information Services Data Center, 9/16/10

https://ecology.wa.gov/finaldistier2-09-16-2010

T-Mobile Data Center - Technical Support Document for Health Impact Assessment

Technical Support Document for Health Impact Assessment (Second Tier Review) for T-Mobile Data Center, 7/17/08

https://ecology.wa.gov/t2t-mobile-tsd

VMware Data Center - Technical Support Document for Health Impact Assessment

Technical Support Document for the Health Impact Assessment (Second Tier Review) for VMware Data Center, 7/17/08

https://ecology.wa.gov/t2vmware-tsd

Yahoo Data Center - Technical Support Document for Health Impact Assessment

Technical Support Document for Health Impact Assessment (Second Tier Review) for Yahoo Data Center, 10/8/07

https://ecology.wa.gov/t2yahootsd

Blackrock-Sabey Data Centers - Technical Support Document for Health Impact Assessment

Technical Support Document for Health Impact Assessment (Second Tier Review) for Blackrock and Sabey Data Centers, 10/5/10

https://ecology.wa.gov/tier2-tsd-blackrock-sabey-cl100510

Titan Data Center Moses Lake Approval Order 15AQ-E616

This is the 2015 air quality permit approval order for Titan Data Center in Moses Lake.

https://ecology.wa.gov/20150520titan15aqe616

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

Intergate Sabey Data Center approval order (notice of construction permit)

This is the August 16, 2022 air quality approval order (notice of construction permit) for Intergate Sabey Data Center.

https://ecology.wa.gov/20220816intergatesabeydatacenterao22aq-e016

Microsoft MWH Data Center approval order (notice of construction permit)

This is the September 27, 2022 air quality approval order (notice of construction permit) for Microsoft MWH Data Center.

https://ecology.wa.gov/20220937microsoftmwh22aqe035

Microsoft Columbia Data Center approval order (notice of construction permit)

This is the September 27, 2022 air quality approval order (notice of construction permit) for Microsoft Columbia Data Center.

https://ecology.wa.gov/20220927microsoftcolumbiadata-center22aqe006

Vantage Data Centers approval order (notice of construction permit)

This is the October 5, 2022 air quality approval order (notice of construction permit) for Vantage Data Centers.

https://ecology.wa.gov/20221005vantagedatacenters22aqe009

Microsoft Columbia 2022 Notice of Construction Application

This is the 2022 air quality notice of construction application for Microsoft Columbia in Quincy.

https://ecology.wa.gov/20220312microsoftcolumbianocapp

Microsoft MWH 2022 Notice of Construction Application

This is the 2022 air quality notice of construction application for Microsoft MWH in Quincy.

https://ecology.wa.gov/20220415microsoftmwhamendreqnocapp

Sabey Intergate 2022 Notice of Construction Application

This is the 2022 Notice of Construction Application for Sabey Intergate Data Center in Quincy.

https://ecology.wa.gov/20211214sabeyquincybuildingenocapp

Vantage Data Center Notice of Construction (NOC) application, March 24, 2022

This is the March 24, 2022 notice of construction application for Vantage Data Center.

https://ecology.wa.gov/20220324vantagenocapp

Oath Approval Order 16AQ-E012 Amendment 2

This is the 2017 amendment 2 approval order for Oath Holdings in Quincy.

https://ecology.wa.gov/20171222oath16aq-e012amend2

CyrusOne Data Center Tier 2 letter

This is the tier 2 letter for CyrusOne Data Center.

https://ecology.wa.gov/20190425cyrusonetier2ltr