Septic costs: what each job should cost

Planning ranges for every common septic job, computed by the same engine as the calculators, with the assumptions published.

The short answer

A routine pump-out costs $300 – $550 for a 1,000-gallon tank. Most repairs cost $150 to $2,500. A new drain field runs $4,700 – $12,400 for a conventional 3-bedroom field, and a whole new system $6,100 – $15,600 for conventional, up to $11,700 – $28,200 for a mound.

In this section

Septic system costInstalled cost by system type, with a calculator and quote check.Pumping costPump-out prices by tank size, and the extras that double a bill.Replacement costTank only, field only, or the whole system — and how to tell which.Drain field replacementLeach field replacement by type and soil, and the fixes to try first.Inspection costVisual vs full inspection, what fails one, and who pays at a sale.Repair costPart-by-part repair costs, from a $50 filter to a $2,500 pump.

ToolSeptic system cost calculatorA planning range for a new or replacement system from type, bedrooms, soil and region — then check a quote for price and scope red flags.ToolSeptic tank size calculatorThe minimum tank for your bedrooms under the model code, with the garbage disposal allowance, the size you'd actually buy and the design flow.

Septic costs at a glance

Job	Planning range
Pump a 1,000-gallon tank	$300 – $550
Full inspection	$300 – $650
Clean the effluent filter	$50 – $350
Replace a baffle	$250 – $900
Replace a pump	$800 – $2,500
Replace a conventional drain field (3 bedrooms)	$4,700 – $12,400
New conventional system (3 bedrooms)	$6,100 – $15,600
New mound system (3 bedrooms)	$11,700 – $28,200
New aerobic system (3 bedrooms)	$8,800 – $21,400

Planning ranges at average regional labour, not quotes. Every assumption is on the methodology page.

How to compare septic quotes

Ask every contractor to itemise the same way — tank, field, pump, design, permit, site work — and compare line by line, not totals. The big differences between septic quotes are rarely the price of a tank; they're what's been left out (the perc test, the permit, the pump chamber) and whether the job quoted is the job you need.

Check a quote with the calculator

Costs that often aren't on the first quote

Septic work has a handful of costs that sit outside the installer's price and surprise people at the end: the county's permit and inspection fees, the soil scientist or engineer who does the perc test and design, electrical work for a pump or aerobic unit, restoring the lawn and driveway after the excavator leaves, and abandoning the old tank on a replacement. On a pump-out, the extras are digging to buried lids and locating a tank nobody marked.

None of these is a sign of a bad contractor. They're a sign that the quote needs to say who is responsible for each one, in writing, before work starts.