King County Board of Health reviews proposed on-site sewage (septic) code revisions ahead of February vote

The King County Board of Health on Jan. 16 heard a briefing from Public Health Seattle & King County on proposed revisions to local on-site sewage (OSS) — commonly called septic — system regulations that staff say will align county code with updated state minimum standards, reduce some homeowner costs and strengthen oversight of septic service professionals.

Board members received a detailed presentation from Dylan Orr, director of the Environmental Health Services Division, and OSS program staff including Lynn Schneider and Karina Marotte. The revisions would take effect April 1, 2025 if the board votes to adopt them at its February meeting.

Public commenters urged both stronger education and attention to cost burdens. Mary Victor, a Sammamish resident, told the board King County estimates about 85,000 OSS systems countywide, roughly 54,000 of which are 30 years old or older; she said homeowners must plan financially because replacement or sewer connection can be expensive. Warren Iverson, a member of the technical advisory committee, said the county previously rejected a broad annual fee proposal and emphasized the goal of avoiding punitive measures that would unduly burden property owners.

Program staff said the proposed package contains 16 substantive code changes developed after more than a year of stakeholder engagement: 19 public meetings, roughly 700 participants, about 600 survey responses and ongoing technical-advisory-committee input. Staff said the principal aims are (1) ensure compliance with the state’s updated minimum standards, (2) reduce unnecessary costs and barriers for property owners, and (3) strengthen oversight and accountability of certified service professionals.

Key changes described by staff include creating a new category of “minor repairs” that can be performed without a prior county permit (intended to reduce time and cost for routine maintenance), allowing certified pumpers to perform routine inspections of gravity septic systems (with safeguards against overselling services), and adding a limited allowance to waive the existing King County requirement to connect to public sewer within 200 feet when connection is infeasible (for example because of extreme cost or environmental constraints). Staff also described a proposed reporting requirement that certified professionals submit a failure report within five days when they identify a system failure, plus new industry performance expectations and enforcement tools aimed at ensuring consistent service across the county.

Presenters said the proposal also responds to equity concerns: an equity impact review and coordination with King County equity teams led staff to add measures intended to protect homeowners with limited means and expand community-based education. Staff flagged a larger funding gap for aging OSS infrastructure: they estimated countywide replacement and management needs could exceed $2,000,000,000 over the coming decades and said further work will be required to identify sustainable funding, outreach and community-based models (the Vashon Island community septic team was cited as a successful local model).

Program staff recommended that the Board consider the updated “striker” (a text revision) planned for February that corrects technical errors identified after public posting. They also offered to provide additional briefings for board members who requested deeper technical briefings on any element of the proposal.

The Board did not vote on the code revisions at the Jan. 16 meeting; staff said the expected date for a vote is the Feb. 20 meeting, and that materials (including the striker) will be circulated in advance.

The briefing followed public comment and technical advisory committee testimony earlier in the meeting and set out next steps for outreach, training and the county’s on-site sewage management planning work required by the state.