Utility Trenching: Water, Sewer, Power & Septic Connections

Every water line, sewer lateral and power run in Jefferson County goes through the same ground: a foot or so of topsoil, then glacial till or hardpan that a shovel will not touch. Eaglemount Excavation, LLC digs utility trenches through that ground for homeowners from Chimacum and Port Hadlock to Port Townsend, Port Ludlow and down US 101 to Quilcene and Brinnon. We open the trench to the depth your permit and utility call for, bed the pipe or conduit in clean material, and close it up so the surface does not settle into a rut next winter. Your plumber, electrician or septic installer makes the connection at each end. We make sure they have a clean, dry, inspectable trench to work in.

What we do

Water line trenching (well to house)

The most common trench we dig is a water service line from a well or a Jefferson County PUD meter to the house. Well runs on rural lots around Chimacum, Discovery Bay and Quilcene can be a few hundred feet, and they usually cross a driveway or a stretch of hardpan. We trench to the required depth, lay sand bedding, and leave the line ready for the plumber’s pressure test before backfill [VERIFY: whether Eaglemount lays the pipe or the plumber does]. If the trench crosses a wet spot we add drain rock so the line is not sitting in water all winter. We can put the water line and a power or telecom conduit in the same trench when the separation rules allow it, which saves a second cut across your yard.

Sewer & septic tank connections

We dig and connect the sewer line from the house to a new or replaced septic tank, and from the tank to the drainfield when the septic designer’s plan calls for it [VERIFY: septic scope, connection and tank-setting work only]. We do not design or install complete septic systems. In Jefferson County a new or replacement system is designed by a licensed designer, permitted through Jefferson County Environmental Health and installed by a certified installer; we do the trenching and connection portion of that work. For homes in Port Hadlock and Irondale connecting to the Tri-Area sewer, we dig the side sewer from the house to the connection point [VERIFY: Tri-Area sewer connection work]. Sewer lines run on grade, so we shoot the fall with a laser and bed the pipe so it stays there.

Power & conduit

Jefferson County PUD supplies power to most of the county, and it sets the trench depth, conduit size and pull-string requirements for a new service. We dig the run from the PUD pedestal or pole to your meter base and lay the conduit to their spec, then leave it open for the PUD inspector before backfill [VERIFY: PUD inspection and who supplies conduit]. The same trench can carry a second conduit for internet or a run to a shop, well house or gate. Your electrician makes the connections. We make the trench.

How deep we bury lines in Washington

Depth is set by code and by the utility, not by frost alone. The Peninsula’s frost line is shallow, so the plumbing code, PUD standards and your septic permit are what matter. Water services go in at [VERIFY: water line depth used, e.g. 24 in. of cover] and sewer lines follow the grade the designer sets, usually deeper at the house than at the tank. PUD power conduit goes to [VERIFY: PUD conduit depth, typically 24 to 36 in.]. Every line gets clean bedding above and below the pipe before native soil goes back in, and warning tape over power.

Trenching cost per foot

Trenching is priced by the foot, and the ground sets the rate. Topsoil and sandy fill dig fast. Hardpan, buried rock and stumps dig slow. Long rural runs cost less per foot than short, tight ones because setup is spread over more footage. Our starting rates are in the cost section below.

How a trenching job goes

1. Walk the route. We stake the run from point A to point B and look for the things that change the price: driveways, septic drainfields, trees and hardpan.
2. 811 locate. Washington law requires it before we dig. We call it in and wait the required time for the marks.
3. Permits and utility paperwork. Water and sewer work is tied to your plumbing or septic permit; PUD service needs a service application. We confirm what is filed before the machine shows up.
4. Dig. We trench with the excavator to the required depth and width, stockpiling topsoil separately so it goes back on top.
5. Bed and lay. Sand or pea gravel under the pipe or conduit, the line itself, then more bedding over it.
6. Inspection. The trench stays open until the PUD, Environmental Health or the building inspector has seen it [VERIFY: which inspections Eaglemount schedules].
7. Backfill and compact. Native soil goes back in lifts and gets compacted so the driveway or lawn does not sink.

Equipment we bring

[VERIFY: excavator sizes, trench bucket widths, compactor, laser level]. On tight lots we can trench with a mini excavator through a gate as narrow as [VERIFY: minimum access width].

What it costs in Jefferson County

• Water line trenching from [YOUR PRICE] per foot in normal soil, from [YOUR PRICE] per foot in hardpan or rock.
• Sewer and septic connections from [YOUR PRICE] per foot, with tank setting from [YOUR PRICE].
• Power and conduit runs from [YOUR PRICE] per foot, bedding included [VERIFY: whether conduit is included].
• Driveway crossings and asphalt cuts add [YOUR PRICE].

Many trenching jobs pair with drainage work or site preparation, and we quote them together.

Utility trenching in Olympic Peninsula soil and rain

Glacial till and hardpan are the reason trenching here is a machine job. The till is dense, full of cobbles and does not drain, so an open trench fills with water in a winter storm and the walls slough. We dig, inspect and backfill as fast as the inspection schedule allows, and we do not leave an open trench through a weekend of rain. Clay under a trench means the backfill will settle if it is not compacted in lifts, which is why so many old water line trenches show up as a dip in the driveway. In the dry months the ground is hard but the work is clean. From October to March we plan trenches around the forecast. We work across the county, from Chimacum and Port Hadlock to Brinnon; see the full service area. If a line has already failed and water is running, our emergency excavation page explains how we handle it.

Recent jobs

• [VERIFY: recent water line job — town, length, well or PUD]
• [VERIFY: recent sewer or septic connection job — town, scope]
• [VERIFY: recent PUD power or conduit run — town, length]

More photos are on our projects page.