Allentown runs on old plumbing, and old plumbing needs a careful hand. Plumbing Pros repairs leaks, clears drains, replaces water heaters, and rebuilds sewer lines across the city. One job at a time, done right the first time.

Plumbing in Allentown, built for Allentown's old houses

Allentown sits at the center of the Lehigh Valley, one of Pennsylvania's largest cities, and its housing stock skews old. A Construction Coverage analysis of Census data found the typical Lehigh Valley home was built in 1970 — more than a decade older than the national median. That age shows up in plumbing first: galvanized and lead service lines, hard water wearing fixtures down, and sewer laterals that predate the neighborhoods above them. When a pipe fails here, it usually fails because it has been working for fifty, seventy, or a hundred years.

The city protects three historic districts — Old Allentown, the Old Fairgrounds, and West Park — where attached rowhouses from the 1850s through the 1930s still line the streets. West End blocks are full of homes built between the 1920s and 1940s. Out in the East and South Sides, single and twin homes from the 1940s through the 1960s dominate. Every era brought its own pipe materials, and most of them are past their prime.

The water itself carries the geology of the region. The Lehigh Valley sits on limestone and dolomite, so the Lehigh County Authority's supply arrives with dissolved calcium and magnesium — moderately hard water that leaves scale on fixtures and shortens the life of water heaters. LCA adds fluoride to Allentown's water as a requirement of its lease of the city system. Hard minerals are not a health hazard, but they are a plumbing hazard: they clog aerators, coat heating elements, and narrow old pipes from the inside.

Below ground the system is older still. Allentown's wastewater flows to the Kline's Island plant on Union Street, part of a regional network the Lehigh County Authority says serves about 270,000 people and treats roughly 32 million gallons a day. Some of the interceptor pipes feeding it are more than a century old, cracked and leaking while tree roots hunt every opening. In 2024 the state committed funding to replace 1,000 private lead service lines in the city — a measure of how much of the buried infrastructure dates to the early 1900s. A plumber who works here every day knows how to read that old system.

That is the work Plumbing Pros does. We repair and replace what Allentown homes are actually built with — copper, PEX, cast iron, clay, and the galvanized and lead lines that still turn up in the oldest blocks. We clear drains, fix water heaters, stop leaks, and rebuild sewer lines with trenchless methods when the line qualifies. And when a job needs a city permit or an inspection, you hear about it before work starts instead of after. Call (877) 401-2673 and talk to someone who knows these streets.

A local crew that reads houses by their pipes

Why Plumbing Pros fits Allentown's housing stock

The first thing you learn working on Allentown plumbing is that the house tells you its age through the pipes. Galvanized stacks in a 1920s West End twin, cast-iron drains under an Old Allentown rowhouse, copper joined with lead solder from the 1970s — each era has a fingerprint. Plumbing Pros reads those fingerprints before quoting a single part. We would rather diagnose than guess, and we say no to work a home does not need. Every visit ends the same way: the problem explained in plain words, your options laid out, and the price written down before any tool comes out.

• Diagnosis before demolition — we test and look inside pipes instead of opening walls on a hunch.
• Options in writing, not pressure on the spot — you pick the scope that fits your budget and your timeline.
• Old-house fluency — we carry parts for cast iron, galvanized, and clay systems instead of improvising.
• Clean as we go — drop cloths from the door to the work area, shoe covers, and a swept workspace when we leave.
• Straight talk about permits — when Allentown requires one, we say so and handle the paperwork.
• One point of contact from the first call to the final walkthrough.

Why Allentown homeowners call Plumbing Pros

The things that actually matter on the job

• Built for old Lehigh Valley houses: We see more pre-1960 plumbing in a month than most shops see in a year, so we know which materials are still sound and which are living on borrowed time.
• Honest about lead and galvanized lines: With the city replacing 1,000 private lead service lines, plenty of homeowners are asking what their own line is made of — we check and tell you straight.
• Water-quality problem solvers: Hard water from the Valley's limestone sits behind half the fixture and heater complaints we hear, so we size softeners and filtration for the water actually coming into your house.
• Sewer cameras on every line call: We look before we quote, which means you see the roots, bellies, and breaks yourself instead of taking our word for it.
• Freeze-season know-how: Pennsylvania winters split pipes in unheated crawl spaces and rowhouse exterior walls — we protect the vulnerable runs and know where to look after a cold snap.
• Respect for your home: Drop cloths, shoe covers, and a full cleanup at the end — the house looks untouched except that the plumbing works.
• Written prices before work starts: The number on the estimate is the number you pay, and if something unexpected shows up mid-job, we stop and talk before touching it.

The plumbing problems Allentown keeps producing

Lead and galvanized service lines in the oldest blocks

In Old Allentown and the Old Fairgrounds, homes built between the 1850s and the 1910s were plumbed with materials no one would install today. Lehigh Valley Public Media reported in 2024 that much of the city's drinking-water infrastructure is more than a century old, and the state committed funding to replace 1,000 private lead service lines in 2024. Lead does not change the taste or color of water, so a line can sit there for decades without anyone knowing. We inspect the service line where it enters the house, document what it is made of, and replace the sections that need to go.

Hard water chewing through fixtures and water heaters

The Lehigh Valley's limestone and dolomite geology loads the local water with calcium and magnesium, making it moderately hard. The symptoms show up everywhere: white crust on aerators and showerheads, soap that will not lather, spotting on dishes, and water heaters that rumble from sediment. Inside the pipes, scale narrows the opening year after year, which is one reason pressure fades in older homes. We flush and service water heaters, size softeners for the actual hardness coming into the house, and recommend fixtures that hold up to mineral-heavy water.

Frozen pipes in unheated spaces after cold snaps

Allentown winters find every weak point a house has. Supply lines running through unheated crawl spaces, cold rowhouse basements, and exterior walls can freeze solid on the coldest nights, and the thaw is when splits show up as ceiling stains or water on the floor. Pipes that froze once will usually freeze again in the same spot. We thaw lines safely, repair the damage, then fix the cause — insulation, rerouting, or freeze-resistant materials like PEX — so the same January night does not cost you twice.

Tree roots hunting old clay and cast-iron sewers

Sewer laterals in the older neighborhoods were laid in clay tile or cast iron, and their joints open a little more every year with age and freeze-thaw. Tree roots find those joints fast — a sewer line is a year-round supply of water and nutrients. The signs are unmistakable: drains that slow down all over the house, gurgling toilets, or sewage odors in the yard. We run a camera to see exactly where the roots are, clear them with hydro jetting, and repair or replace the failed sections — trenchless when the line qualifies.

Cast-iron drains corroding from the inside out

Rowhouses and twins from the late 1800s through the mid-1900s usually drain through cast iron, and cast iron fails from the inside. Rust and scale build up until the pipe is a fraction of its original opening, and the rough interior catches everything that flows past. The result is clogs that keep coming back no matter how many times the line is snaked. A camera inspection shows the real condition of the pipe. We replace failed sections — or whole stacks — with modern pipe sized for the house.

Sump pumps and basement water after heavy rain

Many Allentown homes sit on basements that take water during heavy rain and spring thaws, especially in the lower ground near Little Lehigh and Jordan Creeks. The sump pump is the only thing standing between a storm and a flooded basement — and pumps fail exactly when they are needed most, often from age, a stuck float switch, or a discharge line that froze shut in winter. We service pumps, replace dead ones, and install discharge protection so winter does not lock the line closed.

How a service call actually goes

1. Tell us what you're seeing: Call (877) 401-2673 and describe the problem in your own words — the drip, the smell, the drain that stopped draining. We will ask a few pointed questions: when it started, what changed recently, and where the water shows up. Those answers tell us what to bring and what to look at first, so the visit starts with a plan instead of a treasure hunt.
2. We diagnose with instruments, not guesses: On site, we test before we touch. Pressure gauges, moisture meters, and sewer cameras show us what is actually wrong instead of what looks likely. You see what we see — the camera screen, the meter reading, the corroded section. A diagnosis you can watch is a diagnosis you can trust, and it keeps the repair scoped to what the house really needs.
3. You get written options with firm numbers: Before any work starts, you get your options in writing: what each one fixes, what it costs, and what it does not include. No ranges that balloon, no surprises at the invoice. Take the estimate, think it over, and decide when you are ready. If the job needs a city permit, that is in the paperwork too, handled on our side.
4. The work, done clean: We lay drop cloths from the door to the work area, wear shoe covers, and keep the workspace contained. Cuts are measured twice, joints are pressure-tested before we close anything up, and old materials are hauled out with us. When we leave, the only evidence we were there is plumbing that works — and a swept floor.
5. We test everything together before we leave: Every fixture gets run, every joint gets checked, and every drain gets watched while it flows. We walk you through what was done and what to keep an eye on, in plain words. You get a clear explanation of what is covered and how to reach us at (877) 401-2673 if anything looks off afterward.

Where we work in Allentown

Plumbing Pros covers Allentown from end to end — the rowhouses of Old Allentown and the Old Fairgrounds, the Craftsman and Colonial streets around West Park, the West End's blocks of 1920s to 1940s homes, the East Side and Rittersville, and the South Side up toward South Mountain. Our mapped coverage includes 18101 at the city center and 18102, 18103, and 18104 across the surrounding neighborhoods, along with 18105, 18106, 18109, and 18195. Homes near Little Lehigh Creek and Jordan Creek, the colleges, and the fairgrounds all fall inside that footprint. Whether you are in a 19th-century rowhouse near Center City or a mid-century twin on the East Side, the visit works the same way. Every visit follows the same pattern: a genuine diagnosis, options in writing, and work done with drop cloths down and the area cleaned up after. When a job involves city permits, you hear about it before we start — not after. Don't see your ZIP code? Call (877) 401-2673 and we'll confirm coverage.

Zip Codes We Serve in Allentown

18101, 18102, 18103, 18104, 18105, 18106, 18109, 18195

Testimonials

Our 1930s twin had water pressure that kept dropping. They found the old galvanized lines were nearly closed with rust and replaced the worst sections. The crew laid down coverings everywhere and cleaned up like it never happened. I understood every step because they explained it in plain words.

We had roots in the sewer line and two drains backing up. They ran a camera and showed me exactly where the problem was on the screen. The trenchless repair kept our sidewalk intact and the yard untouched. It has been flowing perfectly since.

Our water heater was coated with so much scale it barely kept up. They walked me through the hard-water problem and installed a new unit with a softener sized for our house. Showers are hot again and the spotting on the dishes is gone.

Frequently Asked Questions

How much does a typical plumbing job cost in Allentown?

It depends on the job, and anyone who gives you a number without seeing the work is guessing. What actually moves the price is the scope of the repair, the materials the house needs, how easy the pipes are to reach, the condition of what is already there, and whether the city requires a permit. A simple fixture swap and a sewer line replacement live in completely different worlds. Call (877) 401-2673 and we will look at your specific situation and give you a written price before any work starts.

Is Allentown's tap water hard?

Yes — moderately hard. The Lehigh Valley sits on limestone and dolomite, and the Lehigh County Authority's supply carries dissolved calcium and magnesium from that geology into Allentown homes. Hard water is not a health hazard, but it is rough on plumbing: it leaves scale on fixtures, spots on dishes, and sediment in water heaters. A softener sized for your home's actual water, plus regular water heater maintenance, keeps the minerals from doing expensive damage.

My house was built before 1940. Should I worry about lead pipes?

It is worth finding out what is in the walls and under the yard. Homes from that era can have lead service lines, lead solder on copper joints, or galvanized steel that is rusting from the inside — lead was not banned from solder until 1986, and Allentown's oldest blocks still turn up lead service lines. The state funded replacement of 1,000 private lead service lines in the city in 2024, which tells you how common they are. We can inspect your line, test the water, and lay out your options, from point-of-use treatment to full replacement.

Can you fix a sewer line without digging up my yard?

Often, yes. Trenchless repair lets us fix or replace a failing sewer line through small access points instead of an open trench, which keeps driveways, sidewalks, and landscaping intact. Whether your line qualifies depends on what the camera shows — severe collapses or extreme bellies can still need excavation. Every sewer call starts with a camera inspection so you see the line's real condition, and then we give you the trenchless and traditional options in writing.

What should I do before a winter cold snap?

Protect the pipes that freeze first: lines in unheated crawl spaces, cold basements, garages, and exterior walls. Make sure those spaces are insulated and that the heat reaches them. Know exactly where your main water shutoff is and that it turns — a shutoff you cannot find or cannot move is useless in an emergency. If a pipe does freeze, call (877) 401-2673 before it thaws; the split usually shows up as the ice melts.

Why does my water pressure keep dropping?

In Allentown the usual suspects are mineral scale and old pipe. Hard water narrows pipes from the inside year after year, and galvanized steel supply lines rust until barely any water gets through. A failing pressure regulator or a partially closed valve can do it too. We measure pressure at several points and check the supply lines to find whether the problem is in the house, at the meter, or in the municipal line feeding your street.

Which ZIP codes do you serve in Allentown?

Our mapped coverage includes 18101, 18102, 18103, 18104, 18105, 18106, 18109, and 18195 — the city center, the surrounding neighborhoods, and the outlying areas. If your home sits just outside one of those, call (877) 401-2673 anyway and we will confirm whether we can reach you.

Do you work on the rowhouses in the historic districts?

Yes — Old Allentown, the Old Fairgrounds, and West Park are regular territory for us. Rowhouses from the 1850s through the 1930s have their own plumbing personality: shared walls, tight basements, cast-iron stacks, and service lines that may be a century old. We work around original finishes and tight access instead of tearing through them, and we are used to the quirks that only show up in houses this old.

Local Weather Risk

Lehigh County has recorded the following severe weather events since 2015, per NOAA's National Centers for Environmental Information:

• Thunderstorm Wind: 211 recorded events (2015–2025)
• Flash Flood: 45 recorded events (2015–2025)
• Hail: 41 recorded events (2015–2024)
• Flood: 7 recorded events (2016–2023)
• Tornado: 5 recorded events (2018–2023)

Source: NOAA NCEI Storm Events Database.

Our Services

• Backflow Prevention Testing & Installation Near Me — Call for pricing
• Bathroom Plumbing Remodel Near Me — Call for pricing
• Bathtub Repair & Installation Near Me — Call for pricing
• Burst Pipe Repair Near Me — Call for pricing
• Commercial Plumbing Services Near Me — Call for pricing

Other Service Areas in Pennsylvania

• Bethlehem
• Easton
• Pottstown
• Reading
• Phoenixville
• All Pennsylvania Service Areas