Routine and transfer inspections
Washington requires inspection at least every three years for a tank-and-gravity system and annually for every other type, performed by a third party authorized by the local health officer.
Scheduled and pre-inspection pumping
Pumping removes accumulated solids before they reach the drainfield. It is also done at the time of a property-transfer inspection in Pierce County.
When the soil absorption system fails
A drainfield that surfaces effluent or backs up has stopped absorbing. Replacement is the largest expense a septic property faces and it is permitted work.
New and replacement systems
A new or replacement system needs a site evaluation, a design, and a permit before installation begins. Pierce County soils vary enough that the design drives the cost.
Soil logs, design, and permitting
A designer evaluates soil and site conditions, then produces the drawing the Health Department reviews. Glacial outwash and till behave very differently in Pierce County.
Keeping a system in compliance
Proprietary and alternative systems carry an annual inspection obligation. An operation and maintenance specialist performs the inspection and files the report.