Sourced from official Tacoma-Pierce County Health Department (TPCHD) program information — last checked July 2026.
Quick answer: if your septic system uses a pump, alarm, aerobic treatment unit, or other mechanical component — or if your property is near a lake, stream, or Puget Sound — Tacoma-Pierce County Health Department requires a routine Operation & Maintenance (O&M) inspection every year or every three years, depending on your system and location. TPCHD notifies property owners by letter when their system is due. Notifications are rolling out neighborhood by neighborhood, so even if you haven’t received one yet, it’s worth checking now.
Why Pierce County Requires O&M Inspections
Septic systems with mechanical parts — pumps, alarms, aerobic treatment units, sand filters — don’t always show obvious warning signs when something starts to fail, unlike a simple gravity system where a slow drain or wet spot in the yard is a clear signal. A pump can quietly stop working for months before anyone notices. Because a failing system near a lake, stream, or Puget Sound can affect water quality for an entire neighborhood, TPCHD requires periodic professional inspections for systems that carry this higher risk.
How Often Is an Inspection Required?
TPCHD sets the frequency based on your system type and how environmentally sensitive your location is. Properties near water bodies, or with certain mechanical system types, are typically inspected annually. Other qualifying systems are inspected on a three-year cycle. TPCHD determines which schedule applies to your property and communicates it directly.
General guideline based on TPCHD’s published O&M program criteria — TPCHD determines and communicates your exact required schedule directly.
Has TPCHD Already Notified Your Neighborhood?
TPCHD has been rolling out O&M notification letters neighborhood by neighborhood rather than all at once. Areas already notified include Lake Tapps (2020–2021), the Key Peninsula (2021–2022), and several watershed basins in 2022 — North Fork of Clover Creek, Alderton Creek, Lynch Creek, Ohop Creek, Salmon Creek, Spiketon Ditch, and Swan Creek. TPCHD has indicated it will continue notifying additional neighborhoods over time, based on environmental sensitivity and risk, with the eventual goal of reaching all septic system owners in the county.
If you haven’t received a letter yet, that doesn’t necessarily mean you’re exempt — it may just mean your neighborhood hasn’t been reached yet. It’s worth finding out your system type now rather than waiting.
Based on TPCHD's published notification history. If your neighborhood isn't listed yet, it may simply not have been reached yet — check with TPCHD directly for your property's status.
TPCHD O&M Notification Rollout
Who’s Qualified to Do Your Inspection
Your O&M inspection has to be performed by a TPCHD-certified O&M specialist. These inspectors are trained and certified through the Washington On-site Sewage Association (WOSSA) and must complete additional training every year to keep their certification current. TPCHD recommends calling at least three certified companies to compare pricing before choosing one.
Financial Help Is Available
If you’re a qualifying low-income homeowner in Pierce County, TPCHD’s assistance program can help offset routine inspection costs:
- $125 off a routine inspection (required first, before other discounts apply)
- $125 toward riser installation
- $200 off tank pumping
- $500 off the cost of minor repairs, in certain areas
Craft3, a nonprofit community development lender, also offers loans for septic repairs and maintenance. Note: these programs apply only to routine inspections — not inspections required as part of a home sale.
What Happens If You Skip It
Beyond the compliance side, skipping a required O&M inspection means a failing pump or component can go unnoticed until it becomes an expensive emergency repair — or a real environmental problem if you’re near a water body. A routine inspection is a small, predictable cost that heads off a much larger one.
Not sure if your system qualifies, or want help understanding a notification letter you’ve received? Connect with a local licensed septic provider.
Frequently Asked Questions
How often do I need a septic O&M inspection in Pierce County?
It depends on your system and location — TPCHD requires either annual or tri-annual inspections, with more frequent inspections for systems near lakes, streams, or Puget Sound.
How do I know if TPCHD has scheduled my property for an O&M inspection?
TPCHD sends a notification letter when your property is due. Past rounds included Lake Tapps, Key Peninsula, and several Pierce County watershed basins — eventually all septic owners will be notified.
Who is allowed to perform my O&M inspection?
Only a TPCHD-certified O&M specialist, trained and certified through the Washington On-site Sewage Association (WOSSA), can perform the required inspection.
Is financial help available for septic inspections in Pierce County?
Yes. Qualifying low-income homeowners can receive discounts on routine inspections, pumping, riser installation, and minor repairs, plus access to Craft3 nonprofit loans.
Does the inspection discount apply to home sales?
No. TPCHD’s financial assistance programs apply only to routine inspections, not inspections required for a property sale.
Where can I find my septic system's official record drawing?
You can look up your system’s record drawing using TPCHD’s as-built lookup tool at tpchd.org/asbuilt by searching your address or parcel number.