HOMEOWNERS GUIDE

Service line coverage: who pays when the pipe under your yard breaks

A standard homeowners policy rarely pays to dig up and replace a buried water, sewer, gas or electric line, because the causes that break those lines, age, corrosion, roots and shifting soil, are excluded or limited in the standard form. A service line endorsement fills that gap. The Maryland Insurance Administration describes typical limits of $10,000 per failure for lines under 50 years old and $2,500 for older lines, with your deductible applied. This page shows which clauses leave the pipe uncovered, what the endorsement adds, and how it differs from the utility warranty offers that arrive in the mail.

Disclaimer: Published averages and benchmark ranges, not a quote. This page is not insurance advice. Your premium will differ based on your home, location, claims history, and insurer. Flood insurance is separate from a standard homeowners policy.

What a service line is, and which part is yours

A service line is the short private pipe or cable that connects your home to a utility network. Federal drinking water rules give one clean definition for the water side: for the lead service line program, 40 CFR 141.2 defines a service line as a portion of pipe that connects the water main to the building inlet. The same idea runs through the other utilities. A sewer lateral carries wastewater from the house to the public sewer. A buried gas line runs from the meter to the house or to a detached building. Underground electric and communication lines run from a transformer, pedestal or pole to your panel.

Ownership of those lines is split, and the split is set by your utility, not by your insurer. The Ohio Consumers' Counsel, a state agency that advocates for residential utility customers, puts the usual pattern plainly: generally, utilities are responsible for the lines outside the home, and property owners are typically responsible for lines from the meter that lead inside their house. It also tells readers to check with the utility about where its responsibility ends, because that point is not the same everywhere. A water meter can sit at the curb or in the basement. A sewer lateral can belong to the owner all the way to the main under the street, or only to the property line. Until you know where your share starts, you cannot know what an endorsement or a warranty would be paying for.

Ask each utility one question, in writing: at what point does your responsibility for this line end, and mine begin? Keep the answers with your policy. They decide whether a break is the utility's repair, your repair, or a dispute.

Why the standard policy rarely pays for the pipe

The clearest way to see the gap is to read the standard form itself. The Insurance Information Institute publishes a specimen of ISO's Homeowners 3 Special Form, and the clauses below are quoted from it: the October 2000 edition (HO 00 03 10 00). Many insurers write on ISO forms or close variants, and state amendments and insurer forms can change any clause below, so treat this as the map of where to look in your own policy, not as your policy.

The sample does not name service lines anywhere. It insures the dwelling and attached structures under Coverage A, and under Coverage B it insures other structures, including structures connected to the dwelling by only a fence, utility line, or similar connection. Whether a buried pipe counts as part of the dwelling, part of another structure, or neither is a wording question your insurer answers. In practice the question rarely decides the claim, because the exclusions below catch most of the ways a buried line fails.

The exception row is the one homeowners most often misread. The sample does respond when water escapes from a pipe and damages the house, and it even pays to tear out and replace part of the building when that is necessary to repair the system. What it refuses, in so many words, is the system itself. A cracked supply line that soaks a finished basement can produce a covered claim for the basement and an uncovered bill for the line. Our burst pipe guide works through the evidence that separates a sudden discharge from a slow leak inside the house; the same split, damage covered and pipe excluded, carries outside.

One more clause shows how the form treats buried pipes. In the loss settlement condition, when the sample works out whether a home is insured to 80 percent of its replacement cost, paragraph 2.c.(3) says not to include the value of "underground flues, pipes, wiring and drains." Underground lines are carved out of the insurance-to-value arithmetic altogether. That carve-out is not a coverage grant or a denial on its own, but it tells you the base form was not built with the buried utilities in its sights.

What a service line endorsement adds

The endorsement exists because of that gap. When ISO, the forms publisher, launched its underground utility line endorsement on July 16, 2020, it described the risk as one "that isn't always handled by municipalities or covered in standard homeowners insurance policies," and said the endorsement can cover underground pipes, wires and some buried equipment from a range of causes, including explosions, tree root growth and wear and tear. It added that policyholders can also be covered for some additional living expenses while the property is uninhabitable, and for loss of rental income. ISO began filing the endorsement state by state in June 2020, so availability still depends on your state and your insurer, and many insurers write their own versions under names such as buried utility lines or underground service line coverage.

The Maryland Insurance Administration gives the most complete regulator description this desk found. Its consumer page describes coverage some insurers offer for service lines buried outside the home: underground pipes and wires that carry water, sewage, drainage, electricity, gas, steam or communication services. The covered event is a disruption, generally a leak, break, tear, rupture, collapse or electrical arcing that causes physical loss or damage. Up to the limit, the regulator lists three things that may be paid:

• repair or replacement of the line, including excavation costs;
• additional living expenses if the home is uninhabitable because of a covered loss; and
• damage to outdoor property, such as trees, shrubs, plants, lawns, walkways and driveways, caused by the line failure or by the excavation.

The same page sets the edges. Usually the coverage does not include pipes or wires within or under the insured house. Blockages and low pressure are usually not covered unless physical damage from a covered cause exists. Insurers may limit coverage, usually by the age of the line, and the loss is subject to the deductibles in the homeowners policy. Availability, terms and cost vary by insurer. Read that list next to the HO-3 table above and the purpose is plain: the endorsement switches on, for buried lines only, the causes the base form switched off.

The age cap, in dollars

The age limit is the term that most changes what an endorsement is worth. The Maryland Insurance Administration says that, generally, the most that will be paid on a one-time failure to a covered line that is less than 50 years old is $10,000, and for lines 50 years or older it is $2,500 (Maryland Insurance Administration, Buried Utility Lines Coverage, read October 30, 2026). Those figures describe typical terms, not a ceiling every insurer uses, and your endorsement prints its own limit. But they show the shape of the trade: the older the line, the more likely it fails, and the less the endorsement may pay when it does.

The worked example below is a labeled hypothetical illustration with verified arithmetic. The repair costs are invented round numbers, not averages or quotes, and the order in which a real endorsement applies the deductible and the limit is set by its own wording. Here the deductible comes off first and the limit caps what remains.

Run the numbers: $9,000 plus $1,800 is $10,800. After a $1,000 deductible, $9,800 remains. Under a $10,000 limit, all $9,800 is paid and the household's share is the $1,000 deductible. Under a $2,500 limit, the endorsement pays $2,500 and the household pays $10,800 minus $2,500, which is $8,300, deductible included. The same failed pipe produces a $7,300 difference in the household's bill, decided by one line in the endorsement: the age of the pipe. If you do not know how old your lines are, find out before you buy, from the home's records, a sewer camera inspection report, or the utility's records of the original connection.

Endorsement or utility warranty: compare the terms, not the envelope

Many homeowners first meet this topic through a letter offering a water line or sewer line warranty, sometimes carrying the name of the local utility or city. Read the sender's name in the fine print: the offer comes from the company named there, and buying it is a choice, not a utility requirement unless your utility says otherwise in writing. A warranty can be a reasonable product. It is not the same product as an insurance endorsement, and the Maryland Insurance Administration says so directly: the insurance coverage is different from service line coverage offered as a warranty by companies other than insurance companies, and may provide different protections.

The Ohio Consumers' Counsel fact sheet on utility line warranties adds the practical cautions. Many plans cover leaks in gas and water lines and water lines from the curb to the home. Many will not cover repairs to pre-existing conditions in the line. Some cap payments and limit how many times they can be used. Plans can cost a few dollars a month, more if several are stacked, and some needed repairs cost less than $500. Its first suggestion is the one this page repeats: check with your homeowners insurer, because utility lines may already be covered, or the coverage may be available as a rider for less than the warranty cost.

The last row matters if you hold both. Condition F in the HO-3 sample says that if a covered loss is also covered by a service agreement, the homeowners insurance is excess over any amounts payable under that agreement, and it defines a service agreement to include a service plan, property restoration plan, home warranty or other similar service warranty agreement, "even if it is characterized as insurance." Under wording like that, two products do not pay twice. They stack in an order, with the warranty first. Our home warranty vs homeowners insurance guide covers the same ordering for appliances and systems inside the house.

One failure, several products: sorting the bills

A buried line rarely fails alone. A collapsed sewer lateral can back sewage into the basement; a broken supply line can undermine a walkway and flood a crawlspace. Each part of that mess can belong to a different product, and the claim goes faster when you sort the bills before you call. This table pairs common failures with the product most likely to answer each part, under the HO-3 sample and the Maryland description. Your own forms decide the real answer.

Notice how often the backup endorsement appears in the right-hand column and the service line endorsement in the middle one. They are different products for the two halves of the same failure. Our water backup coverage guide sizes the backup limit for a finished basement, and the basement flooding guide sorts water by its source across the homeowners policy, the backup endorsement and flood insurance. Flood is a separate policy again: a service line endorsement does not make rising water a homeowners loss.

Buried-line situations the endorsement may not settle

Lines under the house. Maryland's description says the coverage usually does not include pipes or wires within or under the insured house. A slab leak in a supply line under the foundation is therefore often outside the endorsement, and it meets the base form's exclusions for the pipe and its accidental discharge rules for the damage. Ask the insurer where its endorsement stops: at the foundation wall, at the first fitting inside, or somewhere else.

Septic systems, wells and pumps. Drainage appears in Maryland's list of line types, but a septic tank, drain field, well pump or lift station is equipment, not just a pipe. The 2020 ISO announcement mentions some buried equipment. Whether your endorsement includes any of it is a question to put in writing before you rely on it. The base policy's side of a septic failure, from the tank's place under other structures to the EPA's replacement benchmark, is in our guide to septic system failure and homeowners insurance.

Shared laterals. Some older homes share a sewer lateral with a neighbor before it reaches the main. A break on the shared section raises two questions at once: who owns that section under the local rules, and whose endorsement covers it. Settle the first with the sewer authority before you file the second.

Lines the utility owns. Maryland notes that lines the utility company or authority is responsible for are not what the endorsement pays for. If the break is on the utility's side, the repair is the utility's, and the endorsement is not the place to start.

Rental property. The 2020 ISO announcement mentions loss of rental income. If you rent out all or part of the property, ask whether the endorsement on your form includes it and how it interacts with any landlord coverage; our landlord insurance guide covers when a homeowners policy stops fitting a rented house.

Code upgrades on the new line. A replacement line may have to meet current plumbing or utility standards. Whether the endorsement pays for that upgrade, or whether the policy's ordinance or law coverage does, is a wording question. Most endorsement limits are small enough that the answer matters.

What to ask before you add the endorsement

1. Which lines are covered? Water, sewer, gas, electric, communication, drainage, steam. Get the list as the endorsement words it.
2. Where does coverage start and stop? At the utility's connection point, at the property line, at the foundation wall? Match the answer to what each utility told you about ownership.
3. What is the limit, and does it change with the line's age? Get the dollar figure for lines under and over any age threshold.
4. Which deductible applies? Your policy deductible, a separate one, or none.
5. What is excluded? Blockages without damage, pre-existing damage, lines under the house, septic components, wells.
6. Does it pay for excavation and restoring the yard, driveway or walkway? Maryland's description says it may; your form decides.
7. Does it pay additional living expenses or lost rent? And within what separate limit, if any.
8. Can I choose my own contractor? And how is the price for the work agreed?
9. What does it cost per year, in dollars? Compare that against any warranty you hold or are considering, with the excess clause in mind.

Put the questions to two insurers on otherwise identical terms, the method our renewal shopping guide sets out, so the price difference you see belongs to the endorsement and not to some other change. Then check the endorsement line on your next declarations page; an endorsement you discussed but never saw printed is not on the policy.

If a line fails: the first steps

Shut off what you can. For water, close the main shutoff. For gas, leave the area and call the gas utility's emergency number from a safe distance; do not try to find a gas leak yourself. For a downed or arcing electric line, stay away and call the electric utility.

Then call the utility before the insurer, and ask whether the failure is on its side of the line. If it is, the repair is the utility's. If it is on yours, report it to the insurer and, if you hold one, to the warranty provider, the same day. The HO-3 sample's duties after loss apply to any covered claim: give prompt notice, protect the property from further damage, make reasonable and necessary repairs to protect it, and keep an accurate record of repair expenses. A camera inspection report that shows the break, photographs of the excavation and the failed pipe, and the contractor's written estimate split between the line and the yard restoration are the evidence an adjuster will ask for. Keep the failed section of pipe if the contractor can set it aside. Our claim filing guide covers the claim file these documents belong in.

If sewage reached the house, photograph it before cleanup starts and keep the cleanup invoices separate from the line repair. Those are likely to be two claims under two different endorsements, and mixing the paperwork slows both.

This guide is part of our coverage decisions guides; every guide on the site is listed on the main guides page.

Common questions