Operating & Maintenance

Rules and Regulations

We follow regulatory mandates and guidance documents from the State Legislature, Washington State Department of Health, the Environmental Protection Agency (EPA), and Lewis County Codes.

Learn about: Gravity Installation requirements | septic permits.

The Onsite Sewage Program is responsible for evaluating site conditions for onsite septic systems, characteristics of soil in test pits, setting permitting conditions, and issuing permits for onsite septic systems. Onsite Program staff review and comment on land development projects and activities such as subdivisions, Special Use Permits, Boundary Line Adjustments, SEPA documents, and other planning processes proposing onsite wastewater treatment and disposal.

Frequently Asked Questions (FAQ's)

Q:

Do I need a permit to replace my pump?


A:

No. Any work that is conducted within the septic tank does not require a permit. Examples of this type of work includes cleaning, changing, or retrofitting your tank with an effluent filter, measuring sludge accumulation in or pumping the septic tank or pump chamber, or cleaning of the backflow prevention valve.

Q:

How much does a septic permit cost?


A:

The permit application fees are available here.

Q:

Do I need a permit to repair my drainfield?


A:

Yes. Any work outside of the septic tank requires a permit.

Q:

How do I find out information about my septic system?


A:

Stop by the Lewis County Public Services Building (2025 NE Kresky in Chehalis) and fill out a public records request. If the system was permitted, we should be able to provide you with the as-built drawing.

Q:

How do I report a failing septic system or onsite system installed without a permit?


A:

Call the County Code Compliance Office at 360-740-1261.

Training Information

We do not have any upcoming training planned at this time. Please check back occasionally as this may change.

Helpful Links and Forms