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Bill

SB 6291

Concerning on-site wastewater treatment system inspections.

2025-2026 Regular Session Introduced by Liz Lovelett and 1 co-sponsor

SB 6291 establishes inspection requirements for septic systems in Washington to protect groundwater and public health, advancing through committee with amendments.

Effective date 6/11/2026.
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Bill Summary · SB 6291

Legislative bill overview

SB 6291 establishes or modifies inspection requirements for on-site wastewater treatment systems (septic systems) in Washington state. The bill has advanced through the House Environment & Energy Committee with amendments and is currently under Rules review. These systems serve properties not connected to municipal sewer infrastructure, particularly in rural areas.

Why is this important

On-site wastewater systems directly impact groundwater quality, public health, and environmental protection in areas without centralized sewage treatment. Regular inspections can prevent contamination and system failures that create health hazards and costly repairs for property owners. The policy affects thousands of Washington households and small businesses relying on septic systems.

Potential points of contention

  • Inspection frequency and costs: Stricter or more frequent inspection mandates could increase compliance costs for rural property owners already facing higher infrastructure expenses than urban counterparts
  • Enforcement mechanism: Unclear whether local health departments have adequate resources and staffing to implement enhanced inspection protocols uniformly across the state
  • Exemption criteria: Disputes may arise over which systems qualify for exemptions based on age, size, type, or maintenance history, creating fairness and compliance questions

Compiled from official sources — confirm details with the bill’s official record.

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