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1. Gravity System

Your system should be inspected at least once every three years.

2. Low Pressure Distribution System (LPD)

Your system should be inspected annually.

3. Low Pressure Distribution System (LPD) with an Aerobic Treatment Unit (ATU)

Your system should be inspected every six months over a 2-year period after the system is operational and annually thereafter.

A more stringent monitoring frequency may be recommended by the manufacturer. For more information, see the Washington State Department of Health List of Registered On-Site Treatment and Distribution Products.

4. Subsurface Drip System (SSD)

Your system should be inspected 30 days after the system is operational and annually thereafter.

A more stringent monitoring frequency may be recommended by the manufacturer. For more information, see the Washington State Department of Health List of Registered On-Site Treatment and Distribution Products.

5. Subsurface Drip System (SSD) with an Aerobic Treatment Unit (ATU)

Your system should be inspected 30 days after the system is operational, then every six months over a 2-year period. Once the 2-year period is over, your system should be inspected annually.

A more stringent monitoring frequency may be recommended by the manufacturer. For more information, see the Washington State Department of Health List of Registered On-Site Treatment and Distribution Products.

6. Oscar System

Your system should be inspected 30 days after the system is operational, then every six months over a 2-year period. Once the 2-year period is over, your system should be inspected annually.

A more stringent monitoring frequency may be recommended by the manufacturer. For more information, see the Washington State Department of Health List of Registered On-Site Treatment and Distribution Products.

7. Mound System

Your system should be inspected 6 months after the system is operational and annually thereafter.

8. Sand Filter System

Your system should be inspected 6 months after the system is operational and annually thereafter.