On-Site Sewage Systems

Chapter 246-272A WAC, On-Site Sewage Systems, establishes standards for the siting, design, installation, use, care, and management of on-site sewage systems. On March 6, 2018, the Washington State Board of Health (Board) filed a CR-101, Preproposal Statement of Inquiry, WSR 18-06-082, to explore possible updates to the rules.

The Board and the Washington Department of Health (Department) used a collaborative rulemaking approach to gather input during the rulemaking process. The Department’s On-Site Sewage Rule Revision Committee served as the main advisory committee for this rulemaking.

On March 1, 2024, the Board filed the CR-103P, a permanent rulemaking order. The CR-103P, filed as WSR 24-06-046, announces to the public that the proposed rule has been adopted and will become effective. Below you will find the CR-103P and other supporting materials for this rulemaking.

Below are Code Reviser filings for the permanent rulemaking on chapter 246-272A WAC, On-Site Sewage Systems. This includes WSR 06-12-108, originally filed in 2006 regarding on-site sewage system drainfield remediation technologies and withdrawn as WSR 22-17-112. The issues are being addressed in the permanent rulemaking on the chapter.

Supporting documents for permanent rulemaking on chapter 246-272A WAC, On-Site Sewage Systems:

  1. CR-102 (with SBEIS and proposed rule language)
  2. Proposed rule language
    -Spanish Version
  3. Significant Analysis
  4. Small Business Economic Impact Statement
  5. Summary of rule changes
    - Spanish version
  6. Key rule changes
    Spanish version
  7. Homeowner Cost Impacts at a Glance
    - Spanish version
  8. Concise Explanatory Statement

Complementing permanent rulemaking on the chapter, on June 8, 2022, the Board adopted an emergency rule amending WAC 246-272A-0110, filed as WSR 22-13-101 on June 15, 2022. The emergency rule allows retrofits and maintenance of proprietary treatment products with comparable components during supply chain shortages or similar manufacturing disruptions to avoid public health risks associated with poor system performance. Manufacturers of proprietary products affected by a supply chain shortage may submit written component-replacement requests to the Department for review and approval. The proposals must ensure that the comparable components will not negatively impact performance, operation, or maintenance of the original registered product.

Emergency rules are effective for 120 days after filing. Identical or substantially similar emergency rules may be adopted in a series if the agency is actively working to adopt the rule as a permanent rule. Below is the order of Code Reviser filings for this emergency rule, including the most recent CR-103E filed as WSR 24-04-071 on February 02, 2024. The issue is being addressed in permanent rulemaking on the chapter.

For more information on these rulemakings visit the Department’s rulemaking web page and to stay informed on the rulemaking and other wastewater related information, sign up for wastewater email notices from the Department.

Statutory Authority: RCW 43.20.050, RCW 70A.105, RCW 70A.110, RCW 43.20.065
State Board of Health Contact: wsboh@sboh.wa.gov, 360-236-4111
Department of Health Contact: 
Peter Beaton, 360-236-4031