Septic density in Pierce County does not follow population. It follows where sewer was extended and where it was not, which is why the smallest places on this list have the highest proportion of properties on on-site sewage systems.
The heaviest concentrations are in the unincorporated south and east: Graham, Spanaway, the area around Eatonville and Roy, and the foothill towns toward Mount Rainier. These are places where sewer is not coming and septic is the permanent answer.
The Gig Harbor peninsula is the other large unsewered population, and it carries the tightest siting constraints in the county because of shoreline proximity and dense glacial till.
In the sewered cities, Tacoma, Lakewood, University Place and Puyallup, septic survives in pockets: older properties never connected, parcels on the city fringe, and land just outside the limits that carries a city address. Those owners are often the most surprised to find they have a transfer requirement.
Every area below has properties on septic, and each page covers the ground conditions and the problems that actually turn up there.
Tacoma is a sewered city, so most homes here are not on septic. The exceptions are real though: pockets on the city fringe, older properties never connected when sewer arrived, and parcels immediately outside the city limits that carry a Tacoma address.
Lakewood is largely sewered, with septic surviving on older lakefront and large-lot properties and in pockets that were never connected. Properties near the lakes carry additional sensitivity.
Puyallup itself is largely sewered, but the properties on its edges and in the surrounding unincorporated valley and hillsides are on septic. Those are the ones that hit the Report of System Status requirement when they sell.
University Place is mostly sewered. The septic population is small and concentrated in older properties and on the bluff parcels above Chambers Bay and the Sound.
Spanaway is unincorporated Pierce County with a mix of sewered and unsewered blocks. Where sewer has not reached, properties run on-site sewage systems, and the boundary between the two runs street by street rather than neighbourhood by neighbourhood.
Graham is unincorporated and largely unsewered, which makes it one of the densest concentrations of on-site sewage systems in Pierce County. Most properties here are on septic by default rather than by choice, and there is no sewer extension coming for the majority of them.
Bonney Lake has grown quickly and much of it is sewered, but the plateau around it retains a substantial number of properties on septic, particularly on larger parcels and at the edges of the city.
Edgewood incorporated relatively recently and retains a large septic population on its larger residential parcels, particularly away from the sewered corridors.
Gig Harbor city has sewer, but the Gig Harbor peninsula around it is heavily on-site sewage. The peninsula is one of the larger unsewered populations in the county and it sits directly on Puget Sound.
Sumner is sewered in town, with septic on the surrounding valley agricultural land and the hillsides above. It sits at the confluence of the White and Puyallup rivers.
Orting has sewer service in town, with septic on the surrounding valley and upland parcels. The town sits in the Carbon and Puyallup river valleys, which shapes everything about ground conditions here.
Milton straddles the Pierce and King county line. Its Pierce County properties fall under Tacoma-Pierce County Health Department rules, including the Report of System Status requirement, which matters because the two counties administer differently.
Buckley sits on the plateau at the eastern edge of Pierce County toward the Cascade foothills. The town has sewer, and the rural properties around it run on-site sewage systems.
Eatonville is a small town at the approach to Mount Rainier, and the properties around it are overwhelmingly on-site sewage. This is septic country in the plain sense: rural parcels, well water, and no prospect of sewer.
Roy is a small city on the southern prairie and the surrounding area is essentially all on-site sewage. Rural parcels, well water, and no sewer prospect.
Carbonado is a small former coal town above the Carbon River, with properties on on-site sewage systems.
Wilkeson is a former coal and sandstone town in the Carbon River foothills. Its properties are on on-site sewage systems.
South Prairie is a very small town in the eastern county with essentially all properties on on-site sewage systems.
Your request goes to an on-site sewage professional certified by the Tacoma-Pierce County Health Department and serving Pierce County, not a national lead list.
The request form is not accepting submissions yet. This site is new and the intake line is still being set up. Until it is live, nothing is collected here, because a form that renders but delivers nowhere is worse than no form at all.
Prefer to talk? Call (253) 367-7679.