Septic Tank Cost Calculator - Installation Price Breakdown

Calculator Type

Measure In

Gallons and square feet Litres and square metres

Gallons here are US gallons. Every size you enter, every rate, and every answer below follows this choice; the dollar amounts are money either way.

Tank Capacity (gal) *

Tank Price ($ per unit of capacity)

Per gallon, or per litre, to match your choice above. A concrete tank is usually the cheapest per gallon, plastic and fibreglass dearer but lighter to set. Blank means $1.20 a gallon, which is $0.3170 a litre.

Excavator Time (hours)

Excavator Rate ($ per hour, machine and operator)

Drainfield Absorption Area (sq ft)

Square feet, or square metres. Blank means 800 square feet, which is 74.32 square metres. Enter 0 if there is no drainfield in this quote.

Drainfield Rate ($ per unit of area, installed)

Per square foot, or per square metre, to match your choice above. Stone, pipe, fabric and labour; chambers or a mound system run well above this. Blank means $8.00 a square foot, which is $86.11 a square metre.

Perc Test and Soil Evaluation ($)

System Design and Drawings ($)

Permits and Inspections ($)

A pump chamber is needed (the drainfield sits uphill of the tank)

Pump, Chamber, Float and Alarm ($)

Risers, Lids and Effluent Filter ($)

Backfill, Grading and Seeding ($)

Contingency (%)

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Measure In

Gallons and square feet Litres and square metres

Gallons here are US gallons. Every size you enter, every rate, and every answer below follows this choice; the dollar amounts are money either way.

New Tank Capacity (gal) *

Tank Price ($ per unit of capacity)

Per gallon, or per litre, to match your choice above. Blank means $1.20 a gallon, which is $0.3170 a litre.

Excavator Time (hours)

Excavator Rate ($ per hour)

Pumping Out the Old Tank ($)

Removing or Crushing and Filling the Old Tank ($)

Permit and Inspection ($)

Risers, Lids and Effluent Filter ($)

Backfill, Grading and Seeding ($)

Contingency (%)

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