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    • Chronic Disease Prevention
    • Immunizations
    • Communicable Disease
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    • Substance Prevention
  • Environmental Health
    • Food Safety >
      • Food Safety Resources
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YOUR CART

 On-site Sewage System (OSS)

Guidance for OSS

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What is On-Site Sewage?

An on-site sewage system (OSS) is commonly referred to as a septic system or septic tank. OOS is used when a house is not connected to the city sewer system. Many houses in Asotin County use OSS. The major benefit of OSS is that you are able to comfortably live where the city sewer system does not go.  

The homeowner is responsible for the installation, maintenance and repairs of their system. Failed systems can result in sewage reentering the home or leaking into the environment. Local and state code provides guidance to ensure a safe, effective and long lasting system. You can read more about the Washington Administrative Code (WAC) that relate to OSS to learn about the responsibilities of the homeowner. 

Asotin County OSS code can be found here. This code provides information that specifically addresses the unique needs of Asotin County. 
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Video:OSS Basics

Caring for your OSS


Routine maintenance and minor repairs are necessary to ensure the system will last a long time. Properly maintained systems can last for decades. OSS tanks should be pumped every 3-5 years. 

Signs of OSS Failure 
Why Maintain Your Septic System
Quick Tips Videos
EPA Homeowner Septic Smart Guide

Local Resources

Hiring An OSS Professional 

Additional Information

Washington State Approved OSS Tanks
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OSS Lid Safety
​Office of Wastewater Management Information
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Washington State Standards and Guidance

Quick Links

COVID-19 Information
Birth & Death Certificates
Food Permits
WIC
Board of Health 
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Contact 

Mail: 102 1st Street
​PO Box 306
Asotin, WA 99402
P: ​509.243.3344
​F: 509.243.3345
Location: 102 1st Street
​Asotin, WA 99402

Hours

Monday-Thursday
7:30am-5:30pm

Open through lunch
Asotin County Public Health leads the community through education and evidence-based practices to prevent illness, promote health, and protect the environment to improve the quality of life in our communities.