What this estimate can — and cannot — tell you
The range helps organize early planning. It cannot see soil, groundwater, wetlands, buried utilities, access, system condition or a contractor’s current availability. Only a site review, approved design and written proposal can define scope.
Common costs outside the treatment unit
- Engineering, design and permit application fees
- Electrical connections and control-panel work
- Abandonment of existing structures and unexpected conditions
- Driveway, patio, fencing or landscape restoration
- Ongoing maintenance, pumping, power and replacement parts