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.
This page contains information for property owners.
Past due notices for on-site septic system operation and maintenance Background: Clark County Public Health’s (CCPH) On-Site Septic System (OSS) Operation and Maintenance (O&M) Program is sending notices to system owners who are past due on their O&M inspections. Regular O&M inspections are required by state law to protect public health and groundwater.
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.
Why should you maintain your septic system?
- To protect public health.
- To protect our drinking water.
- To protect your investment.
|Type of System||Frequency of Inspection|
|Simple gravity with or without pump||Every 3 years|
|Pressure distribution*||Every 2 years
*Clark County received a waiver from WA-DOH for inspection every 2 years.
All alternative systems (sand mounds, ATU, Glendons, etc.)
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.
|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.|
Maintaining your septic tank
The lack of septic tank maintenance can cause sewage to back up into your house or solids to overflow to the drainfield. Once solids overflow and leave through the tank outlet, they can quickly clog a drain field to the point that a new one is required. Most septic tanks need to be pumped every three to five years, depending on the tank size and the amount and type of solids entering the tank. The inspection of the sludge and scum levels is the only way to determine when a tank needs to be pumped. This is not necessarily a pleasant task, but can be done relatively easily. Septic tank pumping firms are available to perform the inspection. For more information please see our Guide to the proper care and maintenance of your on-site septic system. (PDF)
Local on-site septic system regulations
The Clark County Board of Health adopted Ordinance 24.17, On-Site Sewage (septic) System Rules and Regulations of Clark County Public Health, in October 2007 during a public hearing.
Can resident homeowners do their own inspections?
If it's a simple gravity system, yes! The homeowner must attend a workshop at Public Health and pass the operations & maintenance (O&M) test. An inspection by the resident homeowner can be carried out no more than every six (6) years (every other inspection is to be done by a certified O&M specialist). The inspection reporting form will be provided at the workshop.
Well and Septic Inspection and Maintenance for Homeowners
Learn how to correctly inspect your home septic system to keep your investment working properly. At the conclusion of this presentation, take the Public Health Operations & Management test to become certified to do your own septic inspections (gravity fed only).
To be added to the Septic Inspection Certification Class waitlist contact:
Doug Stienbarger at (360) 397-6060 x 5742 or Doug.Stienbarger@clark.wa.gov.
Help for failing septic systems
Financial assistance is available for homeowners with failing septic systems in need of repair or replacement. Please contact Dawn Lee, Clark County Community Services, at (360) 397-2075 ext. 7811 for further information regarding the Housing Rehabilitation Loan Program.
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.
- On-site application (PDF).
- Service fees (PDF).
- Basic Principles of on-site septic system (PDF).
- Understanding and caring for your septic tank (PDF).
- Washington State on-site sewage (septic) systems rules regulations.
- Clark County certified septic system pumpers (PDF).
- Clark County certified septic system inspectors (PDF).
- Washington State licensed septic system designers (PDF).
- Clark County certified septic system installers (PDF).
- Clark County Property Information Center.
- Clark County Regional Wastewater District – Information for Homeowners.