# What Old Water Pipes Are in Philadelphia Homes, and When Do They Need Replacing?

> Old water pipes in Philadelphia homes: lead, galvanized, copper and PEX, how each fails, what the city code and PWD require, and when a repipe makes sense.

URL: https://philadelphiafreedomrepipe.com/guide/old-water-pipes-philadelphia-homes/

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A plain guide to the water pipes inside an older Philadelphia rowhouse or twin: how to tell lead, galvanized steel, copper and plastic apart, how each one fails, who owns which part, what the city's code and permits require, and how to decide between a repair, a partial repipe and a whole-house repipe.

Last Updated: October 26, 2026

**Most older Philadelphia homes have, or once had, some mix of four materials: a lead or galvanized service line from the street, galvanized steel piping inside, copper from later repairs, and plastic such as PEX from recent rehabs. Galvanized interior pipe corrodes from the inside and is the usual reason for a whole-house repipe; lead belongs to the service line question.** Neither the age of the house nor one symptom proves what is in the walls, so the decision starts at the basement meter.

This guide works through the whole picture for a Philadelphia rowhouse, twin or small apartment building: how the water gets in, which pipes went in when, how to tell them apart, how each one fails, what the city’s code and permit rules say, who owns which section, and what a repipe involves and costs. [Philadelphia Freedom Repipe](https://philadelphiafreedomrepipe.com/) offers and manages [whole-house repiping](https://philadelphiafreedomrepipe.com/whole-house-repiping/), [galvanized pipe replacement](https://philadelphiafreedomrepipe.com/galvanized-pipe-replacement/) and [lead service line replacement](https://philadelphiafreedomrepipe.com/lead-service-line-replacement/) across Philadelphia and nearby Delaware, Montgomery and Bucks County suburbs, with the work done by licensed and insured contractors.

Key takeaways

- The service line (street to meter) and the interior supply piping (meter to fixtures) are two separate jobs with separate permits.
- In Philadelphia the property owner owns the entire service line, curb stop included. In Aqua and Pennsylvania American Water suburbs, the utility owns the part from the main to the curb stop.
- Galvanized steel narrows from the inside, so flow fades upstairs long before it leaks. Low pressure can also come from the service line, a valve or a pressure-reducing valve.
- Philadelphia's code allows plastic water piping such as PEX in one- and two-family dwellings and apartments; other occupancies need metallic pipe.
- A licensed master plumber must oversee plumbing work in the city, under an L&I permit.

## How a Philadelphia house gets its water

Water reaches a Philadelphia house through a chain of parts, and each one can be a different age and material. The Philadelphia Water Department’s main runs under the street. A connection at the main, called the ferrule, feeds the service line, which runs under the sidewalk to a valve near the curb, the curb stop, and on through the front or foundation wall of the house. Inside, it meets the water meter and the main shutoff valve, usually in the basement just behind the front wall. Permit records reflect that layout: L&I service-line permits regularly describe work “from curbstop to water meter inside home” or “sidewalk to front wall”.

Everything after the meter is the water distribution system inside the house: a main along the basement, a branch to the water heater, risers up through the walls and short runs to each fixture. In a rowhouse the meter is at the front and the kitchen and bathroom are often at the back, sometimes with the bath on the second floor, so the supply runs the full depth of the house before it climbs.

That split matters for everything else in this guide. The service line is outside work: a sidewalk opening, a curb stop, a separate permit and, in Philadelphia, sometimes a Water Department program. The interior piping is the repipe. When people talk about old pipes, they are often mixing the two, and the fix for one does not touch the other. The [who owns the water line guide](https://philadelphiafreedomrepipe.com/guide/who-owns-the-water-line-philadelphia/) sets out the boundaries in detail.

## Pipe eras in Philadelphia housing

Philadelphia’s housing is old. Of the city’s roughly 748,000 housing units, 39.9% were built in 1939 or earlier and 64.9% before 1960, and the median year built is 1949, according to the Census Bureau’s American Community Survey. In some ZIPs the share is far higher: 71.6% of homes in 19134 and 65.3% in 19137 predate 1940, while in the far Northeast most homes were built after 1950. More than half of all units, 55.6%, are single-family attached houses, the rowhouses and twins that define most neighborhoods.

Building age gives a rough guide to what went in originally:

- **Lead** was used for service lines in older housing. The Philadelphia Water Department says lead service line installation decreased after the 1950s. PWD’s published inventory counted 14,272 lead lines, 1,189 galvanized, 73,373 non-lead and 436,341 with incomplete records, which PWD says should be treated as possibly lead. PWD estimates that about one in 20 properties may have a lead service line.
- **Galvanized steel** was a common supply pipe inside houses built through the first half of the twentieth century, threaded together in rigid lengths. Interior galvanized is not tracked anywhere: L&I permit text rarely names the material taken out, so no local count exists.
- **Copper** took over for supply piping in later decades and appears in older houses wherever a repair, a new bathroom or a rehab replaced a section. L&I water-service permits often name copper, such as 3/4-inch type K.
- **PEX**, and less often CPVC, is the plastic of recent work. Of the 52 whole-house water-piping replacements L&I permitted over the three years to October 2026, 32 named PEX.
- **Polybutylene**, the gray plastic known for failures in other parts of the country, barely registers here. None of the city’s 97,821 plumbing permits since 2009 names it. That is not proof that none exists, but it is not the Philadelphia story.

The result is that a hundred-year-old rowhouse rarely has one material throughout. A common pattern is a newer copper service line, galvanized mains and risers, and copper or PEX at a remodeled kitchen or bath. That is why the age of the house is context, not a diagnosis.

## How to identify each pipe material

Start at the meter, where the service line comes through the wall, then follow the pipe that leaves the meter toward the water heater and up. The U.S. Environmental Protection Agency’s [Protect Your Tap quick check](https://www.epa.gov/ground-water-and-drinking-water/protect-your-tap-quick-check-lead) describes a simple test: scrape the pipe gently with a coin or key and hold a magnet to it. Do it on the exposed pipe near the meter, not on anything under strain.

### Galvanized steel

Galvanized pipe is dull gray, and a scratch shows the same gray rather than bright metal. A magnet sticks firmly. The joints are threaded: fittings screw onto the pipe, and you can see the threads at the edge of each elbow or tee. Rust staining at those threads is common because the threaded joint is the thinnest point.

### Lead

Lead is also dull gray, but it is soft. A light scratch shows shiny silver metal, and a magnet does not stick. On a service line it often has a rounded bulge where it was joined, sometimes called a wiped joint. Lead turns up mainly on the service line where it enters the house, and PWD notes it can also hide in older solder, fittings, faucets and brass.

### Copper

Copper is the color of a penny where it is scratched, brown to green where it has aged, and not magnetic. Joints are soldered, pressed or compression-fitted, never threaded into the pipe itself. Where copper meets galvanized steel, you should see a brass fitting or a dielectric union at the transition.

### PEX, CPVC and polybutylene

PEX is flexible plastic tubing, usually white, red or blue, printed along its side with “PEX” and its ratings, joined with crimp or clamp rings or expansion fittings. CPVC is rigid cream or tan plastic with solvent-cemented joints. Polybutylene is gray and flexible and may be printed “PB2110”; read the printing before deciding, because PEX also uses crimp rings.

The [guide to identifying your water pipes](https://philadelphiafreedomrepipe.com/guide/how-to-identify-your-water-pipes/) has a step-by-step version of these checks, and PWD’s online service line map shows what its records say for your address. The [lead service line check guide](https://philadelphiafreedomrepipe.com/guide/check-if-you-have-a-lead-service-line/) explains how to read that map and what “incomplete records” means.

## How each material fails

Pipes fail in different ways, and the symptom you notice first depends on the material. Several causes can produce the same symptom, which is why a symptom narrows the search but does not settle it.

### Galvanized: corrosion and scale from the inside

Galvanized steel is iron pipe coated with zinc. Once the coating wears through, the iron rusts on the inside wall, and the rust and mineral scale build up in rough layers that narrow the bore. The outside can look fine for decades while the inside closes down. The first sign is usually flow: a shower upstairs that weakens when someone runs a tap downstairs, or a faucet that never seems to run strong. Next comes discolored water, especially at the first draw or after the water has been off, as scale breaks loose. Leaks usually come last, most often at the threaded joints.

Low pressure has other possible causes. A narrow or failing service line, a partly closed meter valve, an old main shutoff, a pressure-reducing valve, or clogged aerators and fixture cartridges can all reduce flow. That is why a sound diagnosis reads static pressure at the meter and flow at the lowest and highest taps before anyone blames the interior pipe. The [low water pressure guide](https://philadelphiafreedomrepipe.com/guide/low-water-pressure-philadelphia/) and the [rusty water guide](https://philadelphiafreedomrepipe.com/guide/rusty-water-philadelphia/) take those symptoms one at a time.

### Lead on corroded galvanized

Galvanized pipe is not lead pipe, but it can carry lead. The Philadelphia Water Department explains that, over decades, lead from a property’s plumbing can accumulate on the corroded walls of galvanized pipes. That is why galvanized service lines are grouped with lead ones in PWD’s replacement programs and in the federal rules behind them. For interior galvanized, the practical point is the same: rough, corroded steel downstream of lead can hold onto lead and release it later. PWD’s [lead information pages](https://water.phila.gov/lead/) explain how to request a water test, and the [lead in Philadelphia tap water guide](https://philadelphiafreedomrepipe.com/guide/lead-in-philadelphia-tap-water/) covers what the results mean.

### Copper: pinholes with no single cause

Copper does not scale shut the way galvanized does, but it can thin from the inside until a pinhole opens. No single cause explains every case. Water chemistry, flow velocity, workmanship such as leftover flux or burrs at cut ends, and the installed conditions can each play a part. One pinhole may be a local defect; several in different runs point to something system-wide. The [copper pinhole leaks guide](https://philadelphiafreedomrepipe.com/guide/copper-pinhole-leaks/) explains how to tell the difference.

### Corrosion control in Philadelphia water

The Philadelphia Water Department adds zinc orthophosphate to its treated water, which forms a protective coating inside pipes, and has done so for more than 25 years. In its 2025 testing of 106 homes with lead service lines, the 90th-percentile lead result was 2.0 parts per billion. Corrosion control helps slow new corrosion, but it does not remove scale already built up in old galvanized steel, and it does not turn a lead line into a different material. Water hardness also varies across the city: PWD describes its water as moderately hard or hard depending on which treatment plant serves the area.

### Plastic pipe

PEX and CPVC do not corrode, but plastic has its own failure points: fittings, poor support, kinks, exposure to sunlight before installation, and heat near a water heater. CPVC can become brittle with age. Their condition depends heavily on how they were installed, which is why a past repair in plastic is checked at its joints and transitions.

## What the Philadelphia code says about pipe materials

Philadelphia writes its own plumbing code instead of simply following the statewide one. The 2018 Philadelphia Plumbing Code is built on the 2018 International Plumbing Code with local changes; it became mandatory for applications from April 1, 2020, and amendments took effect April 1, 2024. A bill to move to the 2021 International Plumbing Code was introduced in June 2025 and keeps the material rules below; its adoption has not been confirmed.

The material rules that shape a repipe:

- **Plastic allowed in homes and apartments.** Under section P-605.4, water supply piping must be metallic in occupancies other than one- and two-family dwellings and apartments. Plastic such as PEX is therefore allowed in a rowhouse, a twin or an apartment, and L&I permits for single-family PEX repipes are routine. The [is PEX allowed in Philadelphia guide](https://philadelphiafreedomrepipe.com/guide/is-pex-allowed-in-philadelphia/) explains the rule in full.
- **Metallic elsewhere.** A corner store, an office or another non-residential space in a mixed-use rowhouse needs metallic piping, which in practice usually means copper. L&I-approved scopes for commercial spaces state that all supply piping there shall be metallic. Buildings with an occupied floor more than 75 feet above fire-access level also need metallic pipe, with a narrow exception for new construction.
- **Metal at the water heater.** L&I’s EZ permit standards require at least four feet of developed length of copper or similar metallic pipe at the water heater’s inlet and outlet. A PEX repipe still has copper at the heater.
- **Thermal expansion and insulation.** Where a pressure-reducing valve, check valve or backflow device sits on the incoming supply, thermal expansion control is required. Hot water pipes of 3/4 inch and larger, or those serving more than one dwelling, outside conditioned space or buried, need R-3 insulation.
- **No shared lines across property lines.** Water distribution pipe may not cross an adjoining property line, and each building on a street with a main needs its own connection to it. In rowhouse blocks, where neighbors sometimes shared a line in the past, a replacement follows the current rule.
- **Flexible connectors.** Flexible water connectors are allowed only in one- and two-family dwellings and apartments, must be accessible and must meet ASME A112.18.6.

Material choice inside those rules is a trade-off, not a ranking. PEX is flexible, needs fewer joints and is easier to fish through finished walls; copper is rigid, tolerates heat and is required in some spaces. Neither material is the right answer for every house, and the [PEX vs copper repipe guide](https://philadelphiafreedomrepipe.com/guide/pex-vs-copper-repipe/) sets out the differences.

## Permits and who may do the work

In Philadelphia, plumbing work needs a permit from the Department of Licenses and Inspections, including replacement and repair; only minor same-material repairs and stopping a leak are exempt. Any property owner or their authorized agent can apply, but a licensed master plumber must oversee the work. To hold that license, a plumber needs a year as a registered Philadelphia journeyman plumber or approved equivalent, a passing grade on the Philadelphia Master Plumber Examination, current City taxes, and insurance on file. Owners cannot do their own water piping inside the city.

Most rowhouse repipes fall under L&I’s EZ permits, which cover alterations in buildings with four or fewer dwellings up to four stories without plans. L&I’s fee schedule lists alterations to existing one- and two-family buildings at $50 for the first seven fixtures plus $22.50 for each additional fixture, and repair or replacement of water lines at $37 for one- and two-family homes; which line applies to a particular repipe is L&I’s call. A $100 filing fee is paid up front and applied toward the final fee, and small city and state surcharges are added. Replacing the water line from the curb stop into the building is a separate $126 permit, and sidewalk work needs a Streets Department footway permit, issued automatically with the plumbing permit. PWD handles its own permits for main connections and meters.

The [Philadelphia repipe permit guide](https://philadelphiafreedomrepipe.com/guide/philadelphia-repipe-permit/) walks through the steps, and the [guide to who can do plumbing work in Philadelphia](https://philadelphiafreedomrepipe.com/guide/who-can-do-plumbing-work-philadelphia/) explains how to check a license.

## Who owns what, and where to find help

In Philadelphia, the property owner owns the entire water service line. PWD says residential service lines “are owned entirely by the property owner”, and that includes the curb stop. PWD’s rates and charges put it plainly: the owner installs and maintains all piping after the ferrule at the main. That is different from many suburbs, covered below.

When PWD finds a leaking or defective service line, it can issue a Notice of Defect, which requires the owner to have it repaired by a licensed plumber. The [Notice of Defect guide](https://philadelphiafreedomrepipe.com/guide/philadelphia-water-notice-of-defect/) explains the process. Several programs can help with the service line, though none of them pays for interior piping:

- **HELP loan.** PWD’s Homeowner’s Emergency Loan Program offers a 0% loan for service line work, repaid over 60 months, or longer for customers enrolled in TAP or the senior discount. It is open to owners of residential properties with four or fewer units, with an operable meter and a water bill not more than two cycles behind, and a lien is placed on the property. A lead service line qualifies without a Notice of Defect. PWD inspects and prepares the estimate. See the [PWD HELP loan guide](https://philadelphiafreedomrepipe.com/guide/pwd-help-loan/).
- **Service Line Replacement Pilot.** PWD’s federally funded pilot replaces lead or galvanized service lines free for eligible properties, starting with ZIPs 19133, 19134 and 19140 in [North Philadelphia](https://philadelphiafreedomrepipe.com/service-areas/north-philadelphia/) and moving to seven West and Southwest Philadelphia ZIPs in Phase 2. Eligibility is PWD’s to decide.
- **Water main projects.** When PWD replaces a water main, it replaces lead and galvanized service lines on that block from the main to the meter at no charge. PWD says this reaches only about 1% of the city’s mains each year.
- **PHDC Basic Systems Repair Program.** The Philadelphia Housing Development Corporation’s program makes free emergency repairs, including leaking or broken water service lines, for owner-occupied single-family homes that meet income limits and other conditions.

Federal rules point the same way over time. The EPA’s Lead and Copper Rule Improvements require water systems to replace lead service lines within 10 years, and PWD summarizes its obligation as replacing all lead and galvanized service lines within 10 years, starting 2027. The [free lead line replacement guide](https://philadelphiafreedomrepipe.com/guide/free-lead-line-replacement-philadelphia/) compares every route.

## Repair, partial repipe or whole house

There are three scopes, and the right one depends on how much old pipe is left and how it is behaving.

A **repair** replaces a short section at a leak. It makes sense when the rest of the system is sound, for example a single pinhole in otherwise healthy copper or a damaged section from a renovation. On galvanized, a repair at one threaded joint often moves the next failure to the joint beside it, because the pipe on either side is the same age and condition.

A **partial repipe** replaces a defined part of the system: one bathroom group, the risers, or the basement main. It suits a house where an earlier rehab already replaced some runs. The scope should say exactly what stays, where the new pipe meets the old, and what transition fittings are used, because a partial repipe leaves old pipe in service. The [partial repiping page](https://philadelphiafreedomrepipe.com/partial-repiping/) covers how that boundary is drawn.

A **whole-house repipe** replaces the supply piping from the meter and main shutoff to every fixture and the water heater. It is the usual answer when galvanized runs throughout, because restriction and corrosion are spread through the system rather than in one spot. Replacing the main shutoff at the same time is common, and replacing it requires closing the curb stop; the [curb stop guide](https://philadelphiafreedomrepipe.com/guide/philadelphia-curb-stop/) explains what happens if it will not close.

None of these touches the drains. A repipe replaces the pressurized water supply; drain, waste and vent lines are a separate system, as the [does repiping include drains guide](https://philadelphiafreedomrepipe.com/guide/does-repiping-include-drains/) explains. And pipe lining, which coats the inside of existing pipe, is a different method with its own limits, compared in the [repipe vs pipe lining guide](https://philadelphiafreedomrepipe.com/guide/repipe-vs-pipe-lining/).

## What a repipe involves, and living through it

A whole-house repipe follows a predictable sequence. The system is mapped first: where the meter and main shutoff are, which fixtures exist on each floor, where the water heater sits, and how the pipe can travel through the house. In a rowhouse, the usual paths are along the basement ceiling, up through a closet or a stair wall, and across to the bath. New pipe is run and supported, valves are installed so each fixture group can be shut off on its own, and the water heater is connected with its required metallic section.

Most of the new pipe can often be installed while the old system still feeds the house, so the longest water-off period comes at the cutover, when the new system is connected at the main shutoff and the old one is disconnected. Before walls close, the new system is pressure-tested to find leaks while every joint is still visible, then flushed to clear debris. The old galvanized is removed where it is exposed and abandoned in place where it is buried in walls. L&I inspects the work under the permit.

Walls do get opened. The number and size of openings depend on the layout, how the framing runs and where fixtures sit, and in older houses plaster takes more care to open and patch than drywall. A good quote lists every opening and says who patches it and to what finish. The [repiping with plaster walls guide](https://philadelphiafreedomrepipe.com/guide/repiping-plaster-walls/) and the [living through a repipe guide](https://philadelphiafreedomrepipe.com/guide/living-through-a-repipe/) explain what to expect day to day, and the [rowhouse repiping page](https://philadelphiafreedomrepipe.com/rowhouse-repiping/) covers the layout most Philadelphia homes share.

## What it costs

Costs below are typical ranges, not prices for a particular house:

| Scope | Typical range |
| --- | --- |
| Whole-house repipe, rowhouse or single-family home | $4,000 to $15,000+; larger homes and copper jobs can pass $20,000 |
| Whole-house repipe in PEX, typical home | about $4,000 to $10,000; large homes higher |
| Owner-side water service line, private plumber (PWD estimate) | $3,000 to $12,000; more when a street opening is needed |
| Partial repipe | depends on scope; priced from the drivers below |

The service line range is the Philadelphia Water Department’s own estimate for a private plumber. Within each range, the price moves with the size of the house, the number of fixtures and floors, the pipe material, plaster, tile and cabinets in the way, the number of wall openings, how much patching and painting is included, and whether a main shutoff, pressure-reducing valve or water heater connection is part of the job. Labor is part of every one of those. The Bureau of Labor Statistics put the median plumber wage in the Philadelphia-Camden-Wilmington area at $35.99 an hour in May 2025, against $30.67 nationally, about 17% higher. A wage is what a plumber is paid, not what a job is billed at, but it helps explain why area costs sit where they do.

The [Philadelphia repiping cost guide](https://philadelphiafreedomrepipe.com/guide/repiping-cost-philadelphia/) breaks the range down, and the [lead service line cost guide](https://philadelphiafreedomrepipe.com/guide/lead-service-line-replacement-cost-philadelphia/) covers the service line side. The [repipe cost estimator](https://philadelphiafreedomrepipe.com/tools/repipe-cost-estimator/) gives a rough starting point for your house.

## How the suburbs differ

Across the city line, the same old pipes come with different rules.

- **Who owns the line.** In Aqua Pennsylvania territory, which includes towns such as [Upper Darby](https://philadelphiafreedomrepipe.com/service-areas/upper-darby/), Haverford, Abington and Bensalem, the utility typically owns the service line from the main to the curb stop, and the customer owns the rest. Pennsylvania American Water, which serves the [Norristown](https://philadelphiafreedomrepipe.com/service-areas/norristown/) area, owns the line from the main to the curb stop the same way. Both replace customer-side lead and galvanized lines at no direct cost under programs approved by the state Public Utility Commission.
- **Which code applies.** Townships and boroughs in Montgomery, Delaware and Bucks counties enforce the Pennsylvania Uniform Construction Code, which adopts the 2021 International Plumbing Code, effective January 1, 2026. Philadelphia keeps its own amended code.
- **Who issues the permit.** Each township runs its own plumbing permits, fees and contractor rules. Upper Darby requires plumbing permits before water piping is installed or changed, and limits who may apply; Abington requires a township-registered master or journeyman plumber to apply; [Cheltenham](https://philadelphiafreedomrepipe.com/service-areas/cheltenham/) licenses plumbers under its own code.

A suburban repipe is planned the same way as one in the city, from the meter outward, but the permit desk, the utility’s role and the material rules are confirmed for the specific address before work starts. The [service areas page](https://philadelphiafreedomrepipe.com/service-areas/) lists where each set of rules applies.

## Questions about this guide

### How long do galvanized water pipes last in a Philadelphia house?

There is no reliable age at which galvanized supply pipe gives out. Water chemistry, how much hot water runs through it, the quality of the original threads and earlier repairs all change the pace. Judge it by flow at the top floor, the color of the first draw and the condition of the joints, not by the year the house was built.

### Does having galvanized pipe mean there is lead in my water?

Not by itself. Galvanized steel is not lead pipe, but the Philadelphia Water Department notes that lead from a property's plumbing can build up on the corroded inside walls of galvanized pipe over decades and come loose later. Only a water test shows what actually reaches the tap, and PWD's lead pages explain how to get one.

### Is it worth replacing the service line and the house piping at the same time?

Often it is worth planning them together, even when they are done separately. The interior repipe starts where the service line ends, at the meter and main shutoff, so knowing the service line's material and timing avoids connecting new pipe to a line that is about to be dug up. In some ZIPs PWD may replace the line itself.

## Related service

### Whole-house repiping

Every hot and cold supply line from the main shutoff to the fixtures, replaced in the material the Philadelphia code allows for the building and pressure tested before the walls close.

## More guides

- Cost Guide [How Much Does Repiping Cost in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/repiping-cost-philadelphia/)Typical ranges for a whole-house and a PEX repipe, what sits inside the price, the City's permit fees, and why two quotes for the same rowhouse can differ.
- Learn [How Do You Identify the Water Pipes in Your House?](https://philadelphiafreedomrepipe.com/guide/how-to-identify-your-water-pipes/)A step-by-step way to tell galvanized steel, copper, lead, PEX, CPVC and polybutylene apart, using a coin, a magnet and the printing on the pipe, and where to find each run in a Philadelphia rowhouse.
- Learn [Who Owns the Water Service Line in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/who-owns-the-water-line-philadelphia/)Where the Water Department's pipe ends and yours begins, from the ferrule at the main to the last fixture upstairs, and why the line is drawn differently across the city limit.
- Learn [Is PEX Allowed in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/is-pex-allowed-in-philadelphia/)What the Philadelphia Plumbing Code says about PEX water pipe: where it is allowed, where metal is required, the rules at the water heater and the fittings, the pending code bill, and how the suburbs differ.
- Decision Guide [What Causes Pinhole Leaks in Copper Pipe, and Should You Repair or Repipe?](https://philadelphiafreedomrepipe.com/guide/copper-pinhole-leaks/)Why copper water pipe develops pinholes, what Philadelphia's water does and does not explain, how to read the pattern of leaks, and how to decide between a spot repair, a partial repipe and a whole-house repipe.