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Roberts Construction Company
Roberts Construction Company
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Underground utilities · Griswold, CT

In Griswold, underground utilities change at the Jewett City borough line.

Cross one surveyed boundary and water, sewer, and electric all change hands — from a private water company and a borough-owned utility to wells, septic, and the Eversource grid. This page walks that line service by service: what’s under the street on each side, and what we dig on each side. It’s the same first question we ask on every Griswold excavation job: which side of the line is the parcel on?

Griswold utility estimate (401) 479-1472
Underground utilities in Griswold, CT — Roberts Construction Company excavator over an open water line and conduit trench
Underground utility trenching in Griswold, CT — every dig starts with 811 marks.
How to read this pageInside the borough lineOutside it, in the town

Water

Inside the borough line

Jewett City Water Company mains

Water in the borough comes from a private utility older than the borough’s streetlights: the Jewett City Water Company, founded 1894, still family-owned. Supply is the 90-million-gallon Stone Hill Reservoir (built 1899) and the Hopeville Wellfield, pushed through about 27 miles of main. Our side of it is the service line — new taps, and replacing the old services that run from those mains into mill-era basements, some of them galvanized or lead-gooseneck vintage that the company’s service-line inventory is now flagging.

Outside the borough line

Drilled wells and supply lines

Cross the line and the water main under the street disappears. Rural Griswold runs on private drilled wells. Our work becomes the trench between wellhead and basement: supply line below frost, pitless adapter connection, and the siting question of keeping the well clear of the septic system. One exception is growing — the town extended a public water main down Route 164 tied into the water company’s system, so a Preston Road frontage may now have a tap where five years ago it had none.

Either side of the line, the scope runs through our water line installation crew.

Sewer

Inside the borough line

JCDPU gravity sewer to the borough plant

Sewer in Jewett City belongs to the Jewett City Department of Public Utilities, the borough’s own municipal utility since 1897, flowing to the treatment plant on the Quinebaug side. The mains are old and so are the laterals — clay and Orangeburg runs under narrow streets, serving houses built for mill workers in the 1800s. Lateral replacement here is tight-access surgery: short trenches, trench boxes sized to the street, and a JCDPU inspection on the tie-in before backfill.

Outside the borough line

Septic under Uncas Health District

Outside the borough there is no pipe to tie into — wastewater is an onsite septic system permitted through the Uncas Health District, Griswold’s regional health authority. Test pits, perc data, leach fields sized to the soils, and tank sets are the rhythm of rural Griswold. And one asterisk sits in the southeast corner of town: the Village of Glasgo runs its own small public sewer under its own WPCA, with a permit required before anyone excavates a connection inside the village.

Either side of the line, the scope runs through our sewer line installation crew.

Electric

Inside the borough line

JCDPU municipal power

The borough generates its own electric identity too: JCDPU is one of Connecticut’s handful of municipal electric utilities, a member of the Connecticut Municipal Electric Energy Cooperative. Its territory covers Jewett City and slivers of Griswold and Lisbon beyond it. When a borough property wants overhead service buried, we trench and set the conduit and the pull rope to JCDPU’s specs, and their crews make the connections.

Outside the borough line

Eversource territory

The rest of Griswold is on the Eversource grid, and the trench standards change with the utility — conduit schedule, burial depth, sweep radius, and inspection sequence all come from whoever energizes the line. Long rural driveways off Route 138 and 165 are the classic job: several hundred feet of trench from the pole to a new house, often shared with the water line at proper separation, dug once instead of twice.

Either side of the line, the scope runs through our electrical conduit installation crew.

The fine print of the map

Three places the borough line lies to you.

01

JCDPU doesn’t stop at the borough monument.

Both its sewer and its electric serve limited portions of Griswold and Lisbon outside the borough proper. A house can stand a quarter mile past the line and still be a JCDPU customer.

02

Public water is creeping outward.

The Route 164 water main extension put Jewett City Water Company supply in front of parcels that were always well country. Service maps age fast; we pull current ones.

03

Glasgo is its own system entirely.

A village-scale public sewer with its own Water Pollution Control Authority, created by state order in 1969. Sewer excavation there answers to the Glasgo WPCA, not JCDPU and not the health district.

This is why we don’t quote Griswold underground work off an address alone. Service-area maps, a call to the utility, and — on anything near wetlands or the Pachaug system — a look at the drainage picture come first. Wet trenches in the Pachaug catchment often add a drainage scope alongside the utility trenching itself.

Before any Griswold trench

Four owners, one call, zero guessing.

CBYD — Call Before You Dig, 811 — is state law on every dig. In Griswold that one call can summon four different owners to mark: JCDPU for borough electric and sewer, the Jewett City Water Company for water, Eversource in the rest of town, and the Glasgo WPCA’s village system in the southeast corner.

On mill-village blocks we add our own step: hand-exposing near the marks, because a service run in 1900 doesn’t always sit where a 2026 mark says it should.

General guidance — confirm current requirements with JCDPU, the Jewett City Water Company, the Uncas Health District, the Town of Griswold, and CBYD (811) for your specific parcel and scope.

Frequently asked — Griswold utilities

Five questions about who owns what under Griswold.

Who supplies drinking water in Jewett City?
The Jewett City Water Company — a privately owned public water utility founded in 1894 and family-run since 1937. It draws from the Stone Hill Reservoir, built in 1899, and the Hopeville Wellfield, and runs roughly 27 miles of main. Outside its service area, Griswold homes are on private drilled wells. We confirm which side of that map a parcel sits on before quoting any water line work.
Who owns the sewer under Jewett City streets?
The Jewett City Department of Public Utilities — the borough's municipal utility, in operation since 1897. Its collection system runs to the Jewett City wastewater treatment plant and serves the borough plus limited portions of Griswold and Lisbon just outside it. The lateral from your house to the main is the part we excavate; JCDPU governs the connection and inspects the tie-in.
Can I connect to public water or sewer outside the borough?
Sometimes. JCDPU sewer and electric both reach past the borough line into parts of Griswold and Lisbon, and the town has extended a water main down Route 164 (Preston Road) tied into the Jewett City Water Company system. Whether your frontage has a main in it is a map question, not a guess — we check with the utility before pricing a connection versus a well-and-septic build.
What about the Village of Glasgo?
Glasgo is Griswold’s other utility pocket: the village has its own small public sewer system under the Water Pollution Control Authority of the Village of Glasgo, established by a 1969 state order. Any excavation that constructs, repairs, or abandons a sewer connection inside the village needs a permit from that WPCA before we open the street.
Who marks the lines before you trench?
Call Before You Dig — CBYD, dialed at 811 — goes in before every job, borough or town. Each utility marks its own plant: JCDPU marks its electric and sewer, the water company marks its mains and services, and Eversource marks the lines in the rest of town. Mill-village blocks carry the extra wrinkle of old, undocumented services, so we hand-expose near the marks instead of trusting them blind.

Whichever side of the line you’re on, the trench starts with the same phone call.

How we run these scopes everywhere we work is on the underground utilities service page. For the rest of what we do in town, see excavation in Griswold — and if the utility work is clearing the way for a teardown, our Griswold demolition page walks a mill-village demo from disconnect to clean pad.

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