Septic System Installation in Castleton, VT
John Trombley Construction installs septic systems throughout Castleton, Rutland, Middlebury, Lake George, and the surrounding area — new septic tank and system installation sized and set for your property, your soil, and your household. (Looking for a routine pump-out? See our septic pumping page.)
Whether it's a new system on a fresh build, a full replacement of one that's finally given out, or a failed leach field that needs rebuilding, we do the excavation and the septic work under one crew, so you're not coordinating two contractors around one hole.
We're family owned and operated, and every estimate is free.
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Septic Installation & Replacement
New Septic Tank Installation
New septic tank and system installation, excavated and set to fit your property, soil conditions, and household size — from standard gravity systems to engineered mounds.
System Replacement
Older systems that were undersized for the house or were never right for the ground they sit in, taken out and replaced with one built for the site.
Leach Field Replacement & Repair
Failing, backing up, or pooling in the yard? We locate the problem and rebuild it, whether it's the tank, the lines, or the drain field itself.
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Get the System Right the First Time
A septic system that's undersized or set wrong doesn't stay a small problem — it turns into backups, a soggy yard, and a repair bill that dwarfs doing it right the first time.
Because we handle the excavation and the septic work together, the tank sits where it should, at the depth it should, tied into a field that's built to last.
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How a Septic Installation Works
Every new system starts with the ground, not the tank. It begins with a site and soil evaluation — the perc test — which determines what your lot can actually support. We work from that evaluation and the resulting design, then lay out where the tank and leach field need to sit to work for the long haul.
From there we excavate, set and level the tank, run the lines, and build the drain field to the design — then backfill and grade so the finished surface sheds water instead of pooling over the system.
Because the same crew does the digging and the septic work, nothing gets lost between two contractors: the tank ends up at the right depth, on stable ground, tied into a field that's built to spec.
Get A Free EstimateWhat Affects the Cost of a New System
There's no honest flat rate for a septic system, because a handful of things move the number. The biggest is the system type — a standard gravity system on good soil costs very differently than a mound or pump system a difficult site requires.
Soil and site conditions matter just as much: how the ground percs, how much ledge we hit, how far the tank sits from the house, and how easy the site is to get equipment into. Tank size follows the number of bedrooms, and local permitting adds its own steps.
We walk all of this on-site before we quote, so the estimate reflects your actual property — not a guess. It's free, and there's no obligation to book.
Get A Free EstimateAreas We Serve
We provide septic system installation throughout Castleton, Middlebury, Lake George, and the surrounding region. See the full list on our service areas page.
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CastletonFrequently Asked Questions
It depends on the system type, your soil and site conditions, tank size, and local permitting, so we price it after an on-site look rather than quoting a number that won't hold up. The estimate is free and has no obligation.
Slow drains, backups, odor, or wet spots over the field are all signs. We'll inspect it and tell you honestly whether a repair will hold or it's time to replace.
A well-built system that's maintained and pumped on schedule can last decades. Skipping pump-outs or overloading the field is what cuts that short — the drain field is usually the first thing to go.
In Vermont, yes — new and replacement systems require state wastewater permitting, and the design has to be approved before work starts. We handle that process as part of the job so it's not on you to navigate.
Tank size is set mostly by the number of bedrooms in the home, with site and soil factored in. We'll size it correctly for your property as part of the design — an undersized tank is a false economy.
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