How Often Must I Have My Septic System Inspected?

Source: https://www.clallamcountywa.gov/ 

If you own a septic system anywhere in Washington State, you are required by state law to check your septic system on a regular basis to make sure it is working properly. How often you need to check your septic system depends on the type of system you have:

• Basic septic systems with a tank and a gravity-fed drainfield must be inspected at least once every three years. These systems are called conventional gravity septic systems.
• Other types of septic systems must be inspected at least once a year. Pressurized septic systems, sand filters, and mounds are in this category. These types of systems have pumps and other mechanical or electrical parts, and they need to be inspected more often than gravity systems.
• All food service establishments such as restaurants must have annual septic system inspections.

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