Asotin County Health District
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  • Home
  • Vital Records
  • Community Health
    • Chronic Disease
    • Communicable Disease
    • COVID-19 Resources and Information >
      • COVID-19 FAQs
    • Emergency Preparedness
    • Immunization Recommendations >
      • Information for Schools/Child Care Providers
      • Vaccine Preventable Disease
    • Maternal Child Health
    • Substance Prevention
    • WIC >
      • Foods to Avoid In Pregnancy
  • Environmental Health
    • Extreme Heat
    • Air Quality
    • Food Safety >
      • Food Permits
      • Temporary Food Permit
      • Food Permit FAQ
      • Food Safety Resources
    • On-Site Sewage (OSS)
    • Solid Waste >
      • Syringe Collection
    • Public Pools/Spas
  • About Us
    • Board of Health
    • Meet the Team
    • Employment Opportunities
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YOUR CART

 On-site Sewage System

(OSS)

What is On-Site Sewage?

An on-site sewage system (OSS) is commonly referred to as a septic system or septic tank. OSS 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

Picture
Picture
Click here for printable list

Routine maintenance and minor repairs are necessary to ensure the system will last a long time. OSS systems that are properly built and maintained can last for decades. System failures are more likely to happen in tanks that were poorly designed or lack regular maintenance. Systems also do eventually need to be replaced as they do not last forever. 

OSS tanks should be pumped every 3-5 years.  You may need to have your tank pumped more often if your tank is undersized for the usage or if your tank is older. 

System owners may not be aware that their tank is starting to fail. Regular pumping of the tank helps ensure the system is still functioning as it should. System failures can pose a risk to the environment and health. 

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

Additional Information

Washington State Approved OSS Tanks
​
OSS Lid Safety
​Office of Wastewater Management Information
​
Washington State Standards and Guidance
​EPA On-Site Wastewater Treatment Systems Manual, EPA 625/R-00/008

​Asotin County OSS policy-Effective January 2023
Hiring An OSS Professional 

Quick Links

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

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.