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Drainworks crane truck lowering a new septic tank into an excavation
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Septic · West CT branch

Septic installation in Plymouth, CT

New tanks and leach fields, designed from your soil test, permitted with your health district and installed by our own crew.

4.8★★★★★1,386 Google reviews
West CT · call or text(860) 248-6262
Install packages
New tank prices
Starting prices
  • 1,000 gal plastic tankFrom $7,841
  • 1,250 gal plastic tankFrom $8,051
  • 1,500 gal plastic tankFrom $8,451
  • 2,500 gal concrete tankFrom $13,656
Get a quote
$500 off when we install the tank and the field together.
$500OFFComplete tank and field
From$7,8411,000-gallon tank package
#6174CT septic installer license
5%OFFFor plan members

What is included

Every tank package includes.

  • Old tank pumped and abandonedThe old tank is pumped out and abandoned to code.
  • Two-compartment tankA code-compliant two-compartment tank with an outlet filter and risers.
  • Connected and anchoredTied into your existing inlet and outlet piping, with buoyancy control where the water table needs it.
  • Permits and inspectionsHealth district permits, inspections and Call Before You Dig mark-outs.
  • Pre-construction inspectionA pre-construction inspection and design backup before we dig.
  • Graded and seededBackfilled, machine graded and covered with seed and hay.
New septic tank being set in place by the Drainworks crew
Setting a new tank · eastern Connecticut

Starting prices

Tank and field prices.

Starting prices for the common Connecticut installs. Your soil test and house size decide which ones you need.

Complete tank and field
$500 off
Soil testing
Credited back
New system consultation
From $299
Septic installation starting prices · Drainworks 2026 pricebook
ServiceWhat it coversStarting at
1,000-gallon plastic tank
Install package
 Pump and abandon the old tank, new two-compartment tank with filter and risers, permits, grading and seed.
From$7,841
Members from $7,615
Get a quote →
1,250-gallon plastic tank
Install package
 Same package, sized for larger homes.
From$8,051
Members from $7,615
Get a quote →
1,500-gallon plastic tank
Install package
 Same package, sized for five bedrooms and up.
From$8,451
Members from $7,815
Get a quote →
2,500-gallon concrete tank
Install package
 Two-compartment concrete tank for large homes and businesses.
From$13,656
Members from $12,973
Get a quote →
Pump chamber
1,000-gallon H20
 Traffic-rated pump chamber with risers, effluent pump, piping and controls.
From$16,640
Members from $15,008
Get a quote →
Leach field
495 ELA
 Engineered design, plan submission and installation.
From$16,822
Members from $15,981
Get a quote →
Leach field
750 ELA
 Engineered design, plan submission and installation.
From$20,479
Members from $19,455
Get a quote →
Abandon a septic structure
Up to 1,000 gallons
 Pump, crush and fill an old tank or drywell with 10 tons of fill.
From$1,953
Members from $1,855
Get a quote →

Soil testing is credited back, minus the health district fee, when we install your system. Ledge, high groundwater or tight access can add cost, and we price those before work starts. Member prices are for Septic Plan and Family Plan members. Starting prices from our 2026 pricebook. A real person confirms your price before anything is scheduled.

How it works

Test. Design. Permit. Build.

A complete system usually takes weeks from soil test to final inspection, and only a few days of digging.

  1. 01

    Test

    Soil and perc testing with your health district, in up to three test pits.

  2. 02

    Design

    A licensed engineer designs the system from the test results.

  3. 03

    Permit

    We submit the plan and pull the permits.

  4. 04

    Build

    Our crew installs the tank and field, passes inspection and seeds the yard.

Watch

What is soil testing for a septic system?

What happens during soil testing for a new or replacement septic system. Recorded by the Drainworks crew.

What is soil testing for a septic system?What happens during soil testing for a new or replacement septic system.

Connecticut rules

How Connecticut approves a system.

Every new or replacement system is approved by your local health district under the state public health code.

  • Soil testingDeep test pits and perc testsThe health district witnesses the soil testing. The results set the size and location of the field.
  • DesignEngineered plansReplacement fields are designed from the soil data and submitted for approval before we build.
  • LicensingLicensed installers onlySeptic systems must be installed by a licensed installer. Ours is license #6174.
  • InspectionInspected before backfillThe health district inspects the installation before it is covered.
4.8★★★★★Google · 1,386 reviews 4.8★★★★★HomeAdvisor · 216 reviews · 88% five-star
Plumbing PLM.0288824-P7 · Septic installer #6174 · Home improvement HIC.0650272

Questions

Septic installation, answered.

Answers from licensed plumbers and septic installers. Still unsure? Call West CT at (860) 248-6262.

How much does a new septic system cost in Connecticut?
A 1,000-gallon tank package starts from $7,841, and engineered leach fields start from $16,822. A complete system with both is $500 off. Site conditions like ledge or high groundwater can add cost, and we price those up front.
Plastic or concrete tank?
Our standard packages use code-compliant two-compartment plastic tanks with filters and risers. Concrete tanks are available for larger systems and traffic areas.
Do you handle permits?
Yes. Permits, inspections and Call Before You Dig mark-outs are included in our install packages.
How long does installation take?
Most tank replacements take one to two days on site. Complete systems take longer and depend on the design approval.
Is soil testing included?
Soil testing is a separate step, and its cost is credited back, minus the health district fee, when we install your system.

Membership

Out of sight, out of mind.

Like automatic oil delivery for your septic system. We inspect the tank every year and pump it every other year, without you keeping track.

Compare all three plans →

Septic Protection Plan

Septic only
Worry-free, automatic septic maintenance
$24.16per month · 24 months

Or $579.76 paid up front for the full term.

  • Automatic pump-out every two years
  • Yearly inspection and filter cleaning
  • Priority emergency service, no overtime charges
  • 12 inches of digging included
  • 5% off future septic installs
Join the Septic Plan Everything it covers →

Related services

The same crew handles every pipe on the property, from the well to the leach field.

From $1,150Soil & perc testingFor new systems and additionsPrices and details → From $750Leach field repairJetting, D-boxes and new fieldsPrices and details → From $450Septic inspectionsCamera inspection and written reportPrices and details → From $446Septic pumpingPriced by tank sizePrices and details →

Planning a new system? Start with a visit.

Septic consultations across western Connecticut, with tank packages from $7,841 and $500 off a complete system.

West CT · call or text (860) 248-6262
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