Your House Was Plumbed Between 1978 and 1995. Here’s What That Actually Means for Your Pipes.

Short version: if your house was plumbed between January 1, 1978 and July 31, 1995, there is a real chance the supply lines behind your walls are polybutylene, a gray plastic pipe that fails without warning. The fast way to check: look where the pipe enters your basement and at the water heater. Interior polybutylene is gray. If your pipe is blue, do not panic. Blue was used for underground service lines, and blue plastic in a modern home is usually PEX, which is a good, current material. Gray plastic supply pipe with a stamp reading PB2110 is the one that matters, and it is on you to replace now that the settlement money is gone.

The median Anne Arundel County home was built in 1983, which puts most houses in this county squarely inside that window. Of the county’s roughly 236,262 housing units, about 44.9% were built before 1980, so this is not a niche problem. It is the typical local house. Below is the honest version: what that era put in the walls, which parts actually fail, what a fix runs, and how to tell in ten minutes whether you are sitting on a problem or a non-issue. When you want a set of eyes on it, Scardina services and replaces water supply lines for homeowners across the county.

What is polybutylene, and why does the 1978 to 1995 window matter?

Polybutylene, usually shortened to PB, is a flexible gray plastic supply pipe that builders across Maryland used heavily from the late 1970s into the mid-1990s because it was cheap, quick to run, and easy to snake through framing. It typically measures half an inch to an inch across and carries the stamp PB2110. You will most often see it coming off the top of the water heater, at the main shutoff, or where the service line enters the house near the meter.

The date range is not a rough guess. The Cox v. Shell class notice defines the affected installation window as January 1, 1978 through July 31, 1995. That is the period when polybutylene was in wide residential use before it was effectively pulled from the market.

One question homeowners ask: can it still be installed today? No. Polybutylene is not listed among the approved water-supply materials in the International Plumbing Code (Table 605.4), which Maryland follows. If a plumber is putting PB in your walls in 2026, something is very wrong. In practice, the material only shows up in homes of this vintage.

Why does polybutylene fail, and which fittings are the problem?

Here is the distinction that most competitor pages get wrong, and it changes what you should actually look at. The failures were driven far more by the fittings than by the pipe itself, and not all fittings are equal.

The systems that fail are the ones assembled with acetal (plastic) fittings, sold under names like Celcon (Hoechst Celanese) and Delrin (DuPont), used from the late 1970s into the late 1980s. Acetal reacts with the oxidants in ordinary chlorinated municipal water, becomes brittle, and cracks at the fitting. By contrast, polybutylene runs assembled with copper or brass crimp fittings hold up considerably better and rarely fail on their own.

That is why the smart move is not just “is it gray plastic,” but “what is it connected with.” A gray PB line joined with plastic fittings is the high-risk combination. A gray line joined with metal crimp rings is the more durable one. What makes any polybutylene failure nerve-wracking is the way it goes: not a slow, polite drip you catch early, but a line that holds and holds and then splits, often at 2 a.m., often through a ceiling.

The settlement money paid for this once. Is it still available?

No. Two large class actions once reimbursed polybutylene replacement, and both are long closed.

• Cox v. Shell Oil settled for roughly $950 million. Its claim deadline was May 1, 2009. (Do not confuse that deadline with the 1978 to 1995 installation window. They are two different dates.)

• Spencer v. Shell (with DuPont as the maker of the acetal fittings) added another $120 million for certain claims.

If you are buying, selling, or living in a 1978 to 1995 home today, replacement comes out of your pocket. That is exactly why it pays to know what you have before a failure forces the decision for you on a holiday weekend.

What does a polybutylene replacement actually cost?

Numbers are more useful than adjectives here. Nationally, a whole-house repipe on a typical single-family home generally runs $1,500 to $15,000, averaging around $7,500, with the spread depending on the number of fixtures, the layout, and access (Angi, 2026). Roughly 70% of that cost is labor, and a common rule of thumb is about $1,200 per fixture. Patching the small drywall access holes afterward typically adds $300 to $900. Maryland figures vary with local labor rates, so treat these national numbers as a planning range rather than a quote.

Set that against what a failure costs. The average residential water-damage insurance claim is about $13,954 (Insurance Information Institute, 2018 to 2022 data), while catching a problem early and making an accessible repair often runs $150 to $500 (HomeGuide, 2025). And here is the part the Maryland Task Force to Study Pinhole Leaks in Copper Plumbing flagged directly: homeowners policies generally cover the water damage from a burst line, but not the cost of replacing the pipe itself. You pay for the pipe either way. The only question is whether you also pay to dry out and rebuild a room.

There is a quieter cost too. Insurers share claims history through the CLUE database, and two water-damage claims can be enough to push a home into a higher-risk pricing tier, which follows the property even after you sell. That is the real argument for the cheap early repair: it is not just the smaller bill on the day, it is staying out of the tier that raises every premium after.

Does copper from this era need to be replaced?

Not because of its age. Plenty of homes from this window were plumbed in copper, and here is the part a lot of scare-piece content gets wrong: copper of this era is generally the good outcome. Age alone does not doom a copper system.

The Maryland data backs this up. Pinhole-leak reports concentrate in far older housing. The Maryland Task Force to Study Pinhole Leaks in Copper Plumbing found rates above 300 per 1,000 homes for houses built between 1930 and 1939, and roughly 80% of reported cases were in homes built before 1970. Your 1983 copper is not the at-risk cohort.

What does happen to copper is pitting corrosion, the pinhole leak, and it is driven by water chemistry, not the calendar. Research by Dr. Marc Edwards of Virginia Tech links pinhole pitting to a combination of high pH, chlorine, trace aluminum, and the absence of natural organic matter in the water. Signs to watch for:

• Small green or blue-green stains on pipe exteriors, especially near joints

• Tiny crusty deposits (verdigris) on an otherwise dry-looking line

• A pinhole weep leaving a rust or mineral halo on the pipe or the surface below it

• Recurrent leaks in the same run, which points to a whole-system issue rather than bad luck

If you have copper and none of these signs, you are most likely in good shape. Repeat pinholes are worth a whole-system look rather than a patch-and-pray on the one spot that failed.

What about CPVC and early PEX?

Toward the back half of this window you also start seeing CPVC, a cream or off-white rigid plastic, and near the very end, the first generation of PEX tubing. CPVC does its job but grows brittle with age and can crack if it gets bumped or over-torqued, which matters when a plumber is working nearby on an unrelated repair. Early PEX is generally holding up well. None of these define the era the way polybutylene does, but they are part of what an inspection turns up in a house of this vintage.

How do I tell what I actually have?

You do not need to open walls for a strong first read. Spend ten minutes in the places pipe is exposed, and take photos as you go.

1. Where the service line enters the basement, and at the main shutoff. This is where polybutylene most commonly runs. Check the pipe color and look for the PB2110 stamp. Photograph the pipe and any fitting.

2. The water heater. Look at the lines off the top. Gray plastic with a plastic fitting is your polybutylene flag. Copper or PEX is a better sign. Photograph it.

3. Under sinks and at the washing-machine box. Exposed runs here confirm the pattern you saw elsewhere.

Not sure what you are looking at? Send us a photo of the pipe where it enters your basement and we will tell you what you have. Mixed systems are common: a house may have been built in polybutylene and partially repiped, or built in copper with plastic added during a remodel. What you find at one fixture is a clue, not a verdict for the whole house, which is why a full plumbing inspection is the reliable way to settle it. If you want to know what that visit covers before you book, we walk through it in what a plumbing inspection actually checks.

What material is in your house, and what should you do about it?

Use this as a quick reference for the supply materials common in 1978 to 1995 homes. What you find at one fixture is a clue, not a verdict, so treat it as a starting point rather than a whole-house diagnosis.

Polybutylene with acetal (plastic) fittings

• Typical era: late 1970s to late 1980s

• How to spot it: gray pipe, PB2110 stamp, plastic fittings at the joints

• Failure mode: sudden splits at the brittle plastic fitting

• What to do: plan a whole-house repipe

Polybutylene with copper or brass crimp fittings

• Typical era: late 1980s to 1995

• How to spot it: gray pipe, metal crimp rings at the joints

• Failure mode: fittings rarely fail; the pipe still ages

• What to do: have it assessed, plan replacement over time

Copper

• Typical era: throughout the window

• How to spot it: reddish metal pipe, soldered joints

• Failure mode: pinhole pitting, driven by water chemistry

• What to do: monitor; whole-system look if pinholes repeat

CPVC

• Typical era: back half of the window

• How to spot it: cream or off-white rigid plastic

• Failure mode: grows brittle, cracks if bumped or over-torqued

• What to do: handle with care, replace if damaged

PEX (early generation)

• Typical era: near the end of the window onward

• How to spot it: flexible tubing, often red, blue, or white

• Failure mode: generally holding up well

• What to do: no action needed

  

Repair, or repipe?

For polybutylene, the sensible approach is not to chase individual failures. Once the material starts giving out, replacing one fitting simply moves the next failure a few feet down the line. A whole-house repipe, swapping the supply system to modern PEX or copper, is the durable answer, and it is less disruptive than most homeowners fear. Drywall access points are kept small and patched.

For copper, the calculus is different. An isolated pinhole in an otherwise healthy system can be a targeted repair. A pattern of pinholes points toward a water-chemistry fix, a partial repipe of the affected runs, or a full repipe, depending on what the whole-system picture shows.

One thing worth knowing before you consider doing it yourself: Maryland requires a licensed plumber for this work. The homeowner exemption that lets you do some of your own plumbing does not permit you to make the final connection to the water supply. A repipe is not a legal DIY project to finish here, regardless of how the middle of it gets done.

Why does one Anne Arundel house so often need more than one fix?

Being able to answer the whole question is the point. A 1983 house rarely has just one aging system. The same home carrying original supply pipe often has original ductwork and heating and cooling equipment on its second or third replacement, all reaching the end of their service lives around the same time. When we assess a home of this vintage, we identify the pipe material room by room, flag polybutylene and any active copper pitting, check the condition at the fittings that actually fail, and give you a straight read on whether you are looking at monitoring, a targeted repair, or a repipe. No pressure, no scare tactics, just what the pipe is telling us.

Get a Straight Assessment from Scardina Home Services

If your house was plumbed between 1978 and 1995, the smart move is to know what is in the walls before the walls decide to show you. On the visit we identify your supply material room by room, check the fittings that actually fail, and tell you plainly whether you are looking at monitoring, a targeted repair, or a repipe, with real numbers, not vague ranges. Not ready to book? Send us a photo of the pipe where it enters your basement and we will tell you what you have.

Call us at 410.782.0937 or request a free estimate online.

Scardina Home Services | 8082 Veterans Highway, Millersville, MD 21108 | 410.782.0937 | water supply line services

Scardina Home Services repairs and replaces water supply lines for homeowners throughout central Maryland, including Annapolis, Arnold, Crofton, Crownsville, Gambrills, Glen Burnie, Lake Shore, Millersville, Odenton, Pasadena, Severn, Severna Park and Columbia, and the surrounding communities in Anne Arundel County.

Sources & References

• Cox v. Shell Oil class settlement notice, U.S. District Court (installation window January 1, 1978 to July 31, 1995; claim deadline May 1, 2009; approximately $950 million).

• Spencer v. Shell class settlement, with DuPont as maker of the acetal fittings (approximately $120 million).

• Maryland Task Force to Study Pinhole Leaks in Copper Plumbing, Final Report, 2004 (pinhole-leak rates by decade of construction; insurance coverage findings).

• Marc Edwards, Virginia Tech, published research on copper pinhole (pitting) corrosion and water chemistry.

• International Plumbing Code, Table 605.4, approved water-supply piping materials (as adopted in Maryland).

• Angi, “How Much Does a Whole-House Repipe Cost?” 2026 (national repipe range, per-fixture and labor figures).

• HomeGuide, “Plumbing Repair Cost,” 2025 (accessible repair range).

• Insurance Information Institute, “Facts + Statistics: Homeowners and Renters Insurance,” 2018 to 2022 claims data (average water-damage claim).

Frequently Asked Questions