Thurston County, WA Outdoor Lighting: Light Trespass & Shielding (2026)
Key Facts
- Governing section
- TCC 21.57.040(E), Heat and Glare
- Standard
- No glare visible from any property line point
- Method required
- Enclosure fully obscuring the operation
- Enforcing agency
- Community Planning and Economic Development Dept.
- Cost liability
- Joint and several, developer and owner
- Applies to
- Any permitted use under Title 21 zoning
- Adopted
- Ord. 11274 § 1, 1996
Summary
Thurston County's zoning code requires any operation that produces intense heat or glare to run inside an enclosure built so the light cannot be seen from any point along the property line. The rule applies to every permitted land use countywide and is enforced by the Community Planning and Economic Development Department.
21.57.040 - Emissions. ... E. Heat and Glare. Any operation producing intense heat or glare shall be performed within an enclosure so as to completely obscure such operation from view from any point along the property line. ... 21.57.080 - Enforcement. A. In the enforcement of this chapter, the department may require the operator or owner of an existing or proposed activity or use or the owner of the property upon which such activity or use is to be developed or conducted to submit reasonable evidence and technical data to demonstrate that the use or activity is or will be in compliance with the requirements of this chapter. ... D. If significant environmental degradation occurs, or, in the judgment of the department is likely to occur in the development of the property for the permitted use, the department shall require the developer or property owner or both such persons or firms to undertake such steps as are necessary to prevent, repair or mitigate such degradation. The developer and property owner shall be liable jointly and severally for all costs incurred in carrying out such required actions.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 77).
Full Breakdown
010). Subsection (E), titled Heat and Glare, is short but absolute: any operation producing intense heat or glare must be performed within an enclosure so as to completely obscure such operation from view from any point along the property line. There is no lumens threshold or distance test, the standard is a visibility test measured from the boundary itself. ), so heat and glare sit alongside a full set of nuisance controls attached to every permitted use. 020 places the burden on the operator, the proprietor, and the property owner alike to supply whatever evidence and technical data the Community Planning and Economic Development Department needs to demonstrate compliance; failure of the department to ask for that data does not excuse noncompliance.
080 backs that up: the department can require evidence and technical data at any time, commission its own independent studies, and bill the developer, operator, or property owner for the cost of any technical consultant it hires to review the findings.
Violations & Fines
The Community Planning and Economic Development Department enforces Section 21.57.040(E) under the enforcement procedure at Section 21.57.080. Inspectors can demand technical proof of compliance from the operator, proprietor, or property owner at any point, and the department may commission independent studies rather than rely solely on the applicant's data. If unscreened glare or another violation causes significant environmental degradation, or the department judges it likely to occur, the department can order the developer or property owner to prevent, repair, or mitigate the problem, and both are liable jointly and severally for every dollar spent carrying that work out.
Frequently Asked Questions
Does Thurston County regulate light trespass from a business onto neighboring land?
What can the county do if a business's outdoor lighting spills onto a neighboring lot?
Does this heat-and-glare rule cover an ordinary homeowner's porch light?
Sources & Official References
Other rules in Thurston County
Compare Thurston County to another location·View the Washington outdoor lighting overview
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