Overview: Septic Tank Installers
A septic system is a small treatment plant buried in your yard, and putting one in is as much a permitting job as a digging job. Solids settle in the tank, liquid flows out to a drain field, and the soil does the actual treatment. That last part is why the soil decides everything.
The sequence runs the same way almost everywhere. Someone digs test pits and runs a percolation test to see how fast water moves and how high the seasonal water table sits. A design follows, sized by the number of bedrooms rather than by how many people live there now, with setbacks from wells, property lines and surface water. The health department reviews it, issues the permit, and inspects the trenches before they are covered. Nothing gets backfilled until that inspection happens.
Where the soil will not take a conventional gravity field, the design changes rather than the rules: a mound, a pressure-dosed bed or an advanced treatment unit that cleans the effluent before it reaches the ground.
Judge a company on whether it shows you the soil results and the permit, sets the design to your lot, and keeps a reserve area clear. The state and city lists below reach the companies working in your area.
Frequently asked questions
What does a percolation test tell you?
How quickly water soaks away through your soil, which sets the size of the drain field and sometimes rules out a conventional system entirely. The test goes with a soil pit that shows the layers, any rock and where groundwater has reached in the past. Have it done before you buy land you intend to build on, because a lot that will not take a field is a lot with a problem.
How is a new septic system sized?
By the house, not the household. Designs run off the number of bedrooms, because occupancy changes and the system has to serve whoever lives there next. Soil results then set the field area. Adding a bedroom later can mean a system upgrade, and appraisers and lenders will ask whether the permit matches the house, so keep the paperwork with the deed.
Who issues the permit for a new system?
Usually the county or state health department, which reviews the design, issues the permit and inspects the work while the trenches are still open. The installer normally applies on your behalf. Ask to see the approved design and the final sign-off, because that file is what a buyer's inspector and lender will want later, and reconstructing it after the fact is painful.
Can a failed drain field be replaced?
Often yes, and that is what the reserve area on the original design was for. If the ground is saturated because the field has clogged, resting it rarely brings it back once effluent surfaces. Replacement starts over with soil testing and a fresh permit, so treat it as a new install. The tank itself usually survives and gets reused if it is sound.
Tank alone or a treatment plant?
A conventional tank and gravity field is simpler and has no moving parts to fail. An advanced treatment unit cleans the effluent further, which is what you use where soil is poor, the water table is high or the lot is tight. The trade is upkeep: a unit with blowers and controls needs power and a service contract, and it gets neglected first.
