Recorded as in effect on the dataset date. This does not mean every project in a represented state is restricted or approved.
Local construction moratorium · Pierce County only (local rule)
In effect · Unincorporated Pierce County, Washington · Local
Effective: 27 August 2026
Issuing authority: Pierce County Council
On 25 August 2026 the Pierce County Council passed Ordinance No. O2026-557, an emergency ordinance adopting a development moratorium on certain data centers, by a 6-1 vote; the Council's legislative record lists 27 August 2026 as its effective date.
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Local construction moratorium · Tukwila only (local rule)
In effect · Tukwila, Washington · Local
Effective: 3 August 2026
Issuing authority: Tukwila City Council
The Tukwila City Council passed Ordinance No. 2795 on 3 August 2026 as an emergency ordinance establishing a one-year moratorium on accepting, processing or approving applications to establish, expand or change use to internet data centers with capacity over 20 MVA anywhere in the city.
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Enacted legislation or regulation · Seattle only (local rule)
In effect · Seattle, Washington · Local
Source document: 22 July 2026
Issuing authority: Seattle City Council
Seattle Ordinance 127473, passed by the City Council on 21 July 2026 and approved by the Mayor on 22 July 2026, requires Seattle City Light to serve any new large data center load, meaning 10 MVA or more of new or expanded capacity installed within five years after 1 January 2027, under an individual contract instead of general service rates, with minimum terms such as a guaranteed minimum demand.
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Enacted legislation or regulation
In effect · Washington · State
Effective: 1 July 2026
Issuing authority: Washington State Legislature
Washington chapter 266 of 2026 removed the ongoing replacement-server-equipment paths from the qualifying data center sales- and use-tax exemption definitions beginning 1 July 2026.
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Local construction moratorium · Seattle only (local rule)
In effect · Seattle, Washington · Local
Effective: 11 June 2026
Issuing authority: Seattle City Council
Seattle's City Council passed Ordinance 127447 as an emergency ordinance on 9 June 2026, and the Mayor approved it on 11 June 2026, when it took effect.
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Enacted legislation or regulation
In effect · Washington · State
Effective: 3 February 2025
Issuing authority: Governor of Washington
Washington Executive Order 25-05, signed on 3 February 2025 and effective immediately, directs the Department of Revenue to create and lead a Data Center Workgroup with other state agencies to study data centers' effects and recommend policy.
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Incentive or explicitly supportive policy
In effect · Washington · State
Last checked: 1 October 2026
Issuing authority: Washington State Legislature
Washington RCW 82.12.986 is the use-tax counterpart of the rural-county data center sales tax exemption.
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Incentive or explicitly supportive policy
In effect · Washington · State
Last checked: 23 September 2026
Issuing authority: Washington State Legislature
Washington RCW 82.12.9861 is the use-tax counterpart of the large-county (over 800,000 people) data center sales tax exemption.
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Incentive or explicitly supportive policy
In effect · Washington · State
Last checked: 23 September 2026
Issuing authority: Washington State Legislature
Washington RCW 82.08.986 exempts eligible server equipment and eligible power infrastructure for a qualifying computer data center that is in a rural county when the exemption application is received and that meets the section's size and construction-timing conditions.
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Incentive or explicitly supportive policy
In effect · Washington · State
Last checked: 23 September 2026
Issuing authority: Washington State Legislature
Washington RCW 82.08.9861 is a separate sales-tax exemption for eligible server equipment and power infrastructure in an eligible computer data center when the qualifying business is in a county with a population over 800,000 under the 1 April 2021 population estimates cited in the section.
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