Who Owns the Water and Sewer Line to Your House in New Castle County?

The short answer

In New Castle County, the water utility owns the pipe from the main to the curb stop, and you own the pipe from the curb stop into the house. For sewer, the split depends on who runs your system: in Middletown the Town repairs the lateral out to your property line; elsewhere, ask the provider named on your bill.

The exact section of pipe that fails decides who pays for the dig, so this guide lays out the boundaries as each utility publishes them and how to tell which side your problem is on. If you are checking which parts of New Castle County Spangler covers, the rules below apply across the service area, but the utility changes from town to town.

Where the utility’s pipe ends and yours begins

You have two buried pipes, often with two different owners. The water service line runs under pressure from the street main to your house; the sewer lateral runs the other way, by gravity, out to the sewer main. In Bear, the water line can belong to an investor-owned utility while the sewer main belongs to New Castle County.

The water service line

Every water provider we checked draws the line at the curb stop, the small shutoff valve near the sidewalk or property line, usually under a round metal lid.

Artesian Water states that the service line from the main to the curb stop is its responsibility, and that the line from the curb stop into the home, plus all interior plumbing, is the customer’s (Artesian Water). The same page says the meter is Artesian’s property, customers may not operate the curb stop, and the customer must promptly repair any service-line leak at their own expense.

Veolia Water Delaware, which serves more than 100,000 people in the county (Delaware PSC), sets the point of delivery at the curb stop in its tariff and makes the customer responsible for the line from the curb stop to the premises, including repairs (Veolia Water Delaware tariff).

In the City of New Castle, the Municipal Services Commission describes a utility-owned public side from the main to the curb stop, and a private side from the curb stop into the home, with the MSC responsible only for the public side (City of New Castle MSC).

TODO (verify): Middletown runs its own water system (Town of Middletown), but its published code does not state where Town responsibility for a water service ends. Confirm with the Town before publishing a Middletown water boundary.

The sewer lateral

Sewer is where the rules diverge, so the name on your sewer bill matters.

Middletown’s code is unusually generous to homeowners. Where the sewer main sits in the bed of a road, the Town repairs and pays for the lateral from the main to the landowner’s property line, excluding cleaning (Town of Middletown Code § 136-4). Where the main crosses private land instead, the Town covers the first six feet of lateral from the main, and the landowner must first prove through a licensed plumber that the problem sits within that section (§ 136-5). Damage caused by the landowner’s negligence, or that of their guests, is solely the landowner’s to repair (§ 136-6).

Outside the towns that run their own systems, sanitary sewer is a New Castle County service. The County’s Wastewater Division maintains about 1,800 miles of gravity sewer for more than 122,000 customers and lists a 24-hour sewer emergency line on its Wastewater page (New Castle County). After a backup, the County says the owner or occupant is responsible for cleaning the affected area, while the County offers courtesy cleaning of an unfinished basement floor and photographs the damage (New Castle County).

TODO (verify): New Castle County Code Chapter 38 could not be opened during drafting. Confirm the County’s written rule on who owns the lateral between the house and the County main before publishing a County-wide statement.

How to tell which side of the line your problem is on

Symptoms point in a direction; a camera or a leak locate settles it.

Signs it is the lateral

Drains back up at your house only, starting with the lowest fixture, while the neighbors are fine. A soggy or sunken strip runs between your foundation and the street, often with greener grass over it. A water leak on your side shows up as a meter that keeps turning with everything off, one reason Artesian tells owners to keep clear access to the meter (Artesian Water).

Signs it is the main

Several houses on the block back up or lose pressure at the same time. Water bubbles up in the roadway or at a manhole rather than in your yard. The trouble started right after crews worked on the street, or your fixtures drain fine until a neighbor runs a load of laundry.

Who to call first, and in what order

1. Deal with safety. If sewage has entered the basement, the County’s guidance is to turn off main power switches, avoid skin contact, and have a furnace or water heater that took on water checked by a licensed plumber or HVAC technician before use (New Castle County). For a water leak, see what counts as a plumbing emergency.
2. Call the utility before you pay anyone. A County sewer customer calls the 24-hour line on the County’s Wastewater page; a Middletown resident calls the Town. If the fault is on the utility’s side, that is the end of your bill. For a water shutoff, Artesian asks customers to call it rather than touch the curb stop (Artesian Water).
3. Then bring in a licensed plumber. Once the utility clears its main, a sewer camera or leak-locating gear puts the failure on a map; in Middletown, that finding is what the code requires before the Town covers a six-foot section on private land (§ 136-5). Spangler’s sewer and drain service covers this step.
4. Document, then talk to insurers. The County directs property-damage claims to its Office of Risk Management and tells owners to contact their homeowner’s insurer promptly (New Castle County). Whether a policy pays is between you and it.

What a repair on your side actually involves

Access and excavation

Nobody in Delaware digs without notice. The Underground Utility Damage Prevention and Safety Act requires an excavator to notify the approved notification center, defined as the 811 system, not less than three business days and no more than 12 before starting work, and a first violation carries a civil penalty (Delaware Code Title 26 §§ 802, 806, and 810). Miss Utility of Delmarva handles Delaware tickets and takes requests from homeowners as well as contractors (Miss Utility of Delmarva). Ask who is placing the ticket, and do not let anyone dig before the marks are down.

The excavation itself depends on depth, distance to the curb stop or property line, and what sits above the pipe; a lateral under a lawn is a different job from one under a driveway apron. Get the repair method, the trench route, and who is pulling any required permit in writing before work starts.

Restoration, and what is and is not included

An open trench through a front yard does not close itself. Backfill, topsoil, seed, concrete, and pavers are separate line items, and contractors treat them differently. The County’s courtesy cleanup list is a model of how to read a scope, naming what is included and what is not (New Castle County). Ask any plumber or excavator for the same clarity.

What this looks like in Middletown, New Castle, and Bear

Middletown. The Town runs both the water distribution and the sewer collection system inside its limits (Town of Middletown). On sewer, the lateral from a road-bed main to your property line is the Town’s (§ 136-4); cleaning a clog stays with you. The water boundary is the open TODO above.

City of New Castle. Water comes from the Municipal Services Commission, and its public-side/private-side split at the curb stop applies (City of New Castle MSC). TODO (verify): confirm which entity operates the sanitary sewer inside the City of New Castle before naming it.

Bear and Glasgow. Both are unincorporated, so there is no town utility. Sewer is billed by New Castle County, which calculates the annual bill from water usage your water company reports to it (New Castle County sewer FAQ). Water is investor-owned; Artesian’s main system draws on 68 wells across the county (Artesian Water). TODO (verify): confirm from a service-area map which utility serves Bear and Glasgow; until then, the name on the water bill is the answer.

Protection plans. Artesian sells optional water-line and sewer-line plans covering the customer-owned run, with limits and exclusions in the plan terms (Artesian protection plans). If you have one, read it before you call anyone, because the plan may dictate who does the work.

Questions homeowners ask

Does the water company fix a leak between the curb stop and my house?

Not under the rules published by Artesian, Veolia, or the City of New Castle MSC. All three place the curb stop-to-house run on the property owner, and Artesian’s FAQ says the customer repairs it at their own expense. A protection plan is the only exception.

Who pays for a sewer lateral repair in Middletown?

According to Town code, the Town repairs and pays for the lateral from a main in the road out to your property line. From the property line to the house is yours, and so is cleaning a blockage. Owner negligence shifts the whole cost back to the owner.

Do I really need to call 811 for a small dig in my own yard?

Yes. Delaware’s statute applies to any excavation and sets a minimum of three business days’ notice, and Miss Utility of Delmarva takes tickets from homeowners. Gas and electric lines share the same strip of ground.

Will the County clean up after a sewer backup?

Partly. The County offers courtesy cleaning of an unfinished basement floor and takes photographs, but excludes carpets, upholstery, and damaged items. Its guidance puts overall cleanup on the owner or occupant and sends damage claims to its Office of Risk Management.

How do I find out who my water and sewer providers are?

Look at your bills. In unincorporated New Castle County, an annual sewer bill from the County means the County owns the main, and the water bill names the water utility. Inside Middletown or the City of New Castle, the Town or the MSC bills you directly.

Before you dig or sign anything

Find out which side of the line the problem is on before you agree to a price; the utility side costs you nothing and the private side costs whatever the scope says. Call the utility, then have the line inspected so the finding is on paper and the 811 ticket is placed before anyone digs. Spangler is a Delaware Master Plumber and runs around the clock; for coverage by town, see which parts of New Castle County Spangler covers.