Property Owners

Clark County Public Health’s On-Site Septic System Operation and Maintenance Program (CCPH OSS O&M) regularly sends notices to system owners who are past due on their O&M inspections. Regular inspections are required by state law to protect public health and groundwater.

It is important to maintain your septic system to protect:

  • public health
  • local creeks, streams and rivers
  • drinking water
  • your investment

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Operation and maintenance of your system

Septic systems are usually not considered an essential part of a home. But replacing a residential septic treatment system may cost between $7,000 and $15,000!  Periodic inspection and timely repair of your system components can prevent damage to the soil and water in the ground around your home, and may extend the useful life of your system.

Washington Administrative Code chapter 246-272A and Clark County Code 24.17 requires homeowners whose property is not connected to a municipal sewer system to ensure that the property includes an approved, correctly functioning on-site septic system. Proper maintenance is defined in the code as:

  • Determining the level of solids and scum in the septic tank every three years.
  • Employing an approved pumper to remove septage from the tank when necessary.
  • Protecting the system components and required reserve septic area from damage by structures or materials, surface drainage, soil compaction, soil removal or grade alteration.
  • Keeping the sewage flow at or below designed quantity and waste strength.
  • Directing roof drains away from the area of the sewage treatment system.
  • Operating and maintaining alternative sewage disposal systems if directed by the County Health Officer.

For more information please see our Guide to the proper care and maintenance of your on-site septic system.

Septic tank cleaning

For all systems ensure that a current report of system status is on file with Clark County Public Health when a property served by anon-site septic system is offered for sale. The report of system status is considered current for purposes of this subsection if it was completed within one (1) year of the date of sale.

  • Every 3 years: Simple gravity with or without a pump
  • Every 2 years: Pressure distribution (Clark County received a waiver from WA-DOH for inspection every 2 years.)
  • Annually: All alternative systems (sand mounds, ATU, Glendons, etc.) and all food establishments
    • Note: Some systems are so complex the manufacturer recommends inspection more often for the first 2 years; be sure to meet the conditions of your warranty.
Septic tank looking inside

If you have a simple gravity system, you may be able to inspect your own system. Clark County Public Health offers a course where homeowners learn to correctly inspect their septic system and keep their investment working properly.

An inspection by a resident homeowner can be carried out no more than every six years (every other inspection is to be done by a certified O&M specialist). The inspection reporting form will be provided at the workshop.

Upcoming course opportunities

To be added to the Septic Inspection Certification Class waitlist contact:
Terry Koper at 564.397.6060 extension 5729.

Septic tank pumping

Our office does not recommend any particular septic operation and maintenance specialist, but does provide a list of persons/businesses who are currently certified with Clark County Public Health to conduct septic system inspections. Questions? Call 360.397.8428.

Frequently asked questions


Regular O&M inspection of your septic system is state law.  It is also important to maintain system components and the drain field to ensure that your system continues to treat wastewater effectively. Regular O&M will protect groundwater, extend the life of your system, prevent system failure and maintain the value of your home and property.


A basic inspection by an O&M service provider can range from $99.00 – 115.00 dollars, but can be more based on the type of system. Additional costs may occur if service of the system is needed or the tank needs to be pumped. Review the list of Clark County Certified Septic System Inspectors (located at the bottom of this page) and call several to get an estimate.


County code and state law require regular septic system O&M. There are over 35,000 septic systems operating within Clark County. Since over 90% of drinking water in Clark County is sourced from groundwater it is critical that we protect it by ensuring that septic systems are performing as designed.


CCPH’s OSS database has been improved to allow more accurate evaluation of O&M records. Current staffing will allow for timely response to the expected O&M reporting increases. CCPH now has the resources in place to ensure that septic systems are being maintained.


CCPH will be evaluating O&M compliance and will be determining how best to achieve full compliance with system owners over the next two years. CCPH would prefer to work cooperatively with all system owners to help them get into compliance.


O&M inspections are the only way to determine the septic system is operating properly. Without routine inspections, a neglected minor repair could result in higher cost repairs or the need for a new system. Improperly functioning OSS can harm our families, pets, and wildlife by contaminating drinking water, surface water, and the soil. Since 90% of our drinking water in the County comes from groundwater, protecting this resource is critical.


CCPH maintains a list of qualified service providers, see the Clark County Certified Inspector list. CCPH cannot recommend a specific service provider, so we recommend you contact several and get estimates. Owners of standard gravity systems can periodically perform their own system inspections after taking a training class. See the “Homeowner” link on the prior page to find out more about how to take the class.