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How to find us

Phone: 206-296-4600
TTY Relay: 711

Toll-free: 800-325-6165

Click here to email us

Instructions to submit a Public Records Request

Wastewater Program

Black River Environmental Health
900 Oakesdale Ave. SW, Suite 100 [ MAP ]
Renton, WA 98057
Phone: 206-296-4932

Office hours:
  • Monday, Tuesday, Wednesday
    7:00 am to 5:00 pm

  • Thursday
    9:00 am to 5:00 pm

  • Call our "Sanitarian of the Day" (SOD) for technical and general questions at 206-296-4932.
    The SOD is available Monday through ThursdayWednesday, 7:00 am to 12 noon and Thursday 9:00 am to 12 noon. For best service, calls should be limited to these hours and days.

Information for specific groups


For septic system owners

For septic system professionals

For real estate professionals

NOTE: All septic systems must be inspected at the time of sale. Forms available on the following Web pages:

Vashon-Maury Island Marine Recovery Area
A Marine Recovery Area is a specific designation under state law that establishes the goal of protecting, preserving and restoring shellfish harvest opportunities by assuring that property owners within the Marine Recovery Area inspect, and repair or replace as necessary, their On-Site Sewage (OSS) system.

Our services

The Wastewater Program provides educational, advisory and permitting services for owners of septic systems and certifications for several septic professionals. A Sanitarian of the Day is available Monday - Wednesday and Friday to help answer technical and general questions. Program activities include:

  • Complete list of Wastewater Program fees
  • Document pricelist
  • Issuance of installation and repair permits for septic systems
  • Review of the following:
    • Site application review
    • Review of repair proposals for failing septic systems
    • Boundary line adjustment review
    • Short plat and subdivision review
    • Building permit review (remodel project review)
    • Operation/Performance Monitoring Reports
  • Installation inspections of new, modified or repaired septic systems
  • Sewage complaint investigations relating to septic systems
  • Homeowner education
  • Operational checks of existing septic systems for sale or refinance
  • Certification program for all septic system Pumpers, Installers and Onsite System Maintainers
  • Enforcement
  • Sanitarian of the Day (SOD)

Free brochures

Free brochures are available at the Black River Public Health Center. Call to order at 206-296-4932 or toll-free, 800-325-6165 ext. 6-4932.

Types of brochures:

  • For homeowners including condos, duplexes and mobile homes. Learn how to maintain your on-site septic system and avoid costly repairs. Download the electronic version of the Homeowners Guide (PDF).
  • For real estate professionals Information for your clients who are selling or buying homes or businesses with an on-site septic system.
  • For non-residential buildings including food establishments, businesses, schools, churches, etc.
About us

The Public Health Wastewater Program helps to ensure that over 115,000 septic systems including 192 septic systems in Seattle are safe. Septic systems treat wastewater when homes and buildings are not connected to public sewer systems.


see also

Download the "Green Septic Systems" Brochure for Homeowners in PDF format


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