Allegheny County · Pennsylvania
Plumbers in Pittsburgh, PA
A tenth of an inch of rain is enough to overload Pittsburgh's combined sewer. That is not a storm, it is a shower, and the system it overwhelms was built between 1889 and 1912 to carry stormwater and sewage in the same pipes.
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Local plumbing problems
What goes wrong with plumbing in Pittsburgh
Combined sewer backups on very little rain
Pittsburgh's combined sewer carries wastewater and stormwater together, and as little as a tenth of an inch of rain can overload it. Raw sewage then backs up into basements and overflows into the rivers.
Cracked and broken house laterals
The EPA estimates that up to 50 per cent of the inflow and infiltration problem may come from house laterals. Sewer pipe is generally designed for about 20 to 50 years, and in this region laterals have frequently gone far longer without inspection.
Lead service lines across the city
About a quarter of the water authority's customers had lead service lines. A major replacement programme has been running since 2017, with more than 8,500 public and more than 5,000 private lines replaced and the 11,000th line removed.
Hillside sewer runs at extreme grades
Sewer lines here run down hillsides at extreme grades, under railroad tracks, across ravines and through retaining walls. That makes repair and replacement dramatically more expensive than the same work in a flat city.
A system old enough to be historic
The combined sewer system was built between 1889 and 1912. Infrastructure of that age deteriorates on its own schedule, and much of the private pipe connected to it was installed in the same era.
Freeze-thaw working on aging pipe
Pittsburgh winters cycle across the freezing line repeatedly, stressing pipe and joints each year. On material already decades past its design life, that annual cycling is often what produces the visible failure.
A tenth of an inch
Most cities with combined sewers have a rainfall threshold above which the system overflows. Pittsburgh’s is startling: as little as a tenth of an inch of rain can overload it.
That is not a storm. It is the kind of rain you would not change your plans for. When the system overloads, raw sewage backs up into basements and overflows into the three rivers, which is why this is both a household problem and a regional environmental one.
The reason is the age and design of the network. Pittsburgh’s combined sewer system was built between 1889 and 1912, carrying wastewater and stormwater in the same pipes. It was a reasonable approach at the time and it has been carrying a city that grew around it ever since.
The regional response is proportionate to the problem. ALCOSAN is under a federal consent decree to address sewage reaching the rivers, and its Clean Water Plan is expected to cost more than 4.5 billion dollars, with the Ohio River Tunnel the first of three tunnels planned over the coming decade. That is a long timeline, which is why household-side protection matters in the meantime. A backwater valve on the house drain closes when the sewer pushes back toward the building.
Your lateral is half the problem
Here is the detail that makes Pittsburgh different from most combined sewer cities, and it changes how a homeowner should think about their own pipe.
The EPA estimates that up to 50 per cent of the inflow and infiltration problem may be due to problems with house laterals. Not mains, not treatment capacity: the private pipes running from individual buildings.
The reason is arithmetic. Sewer pipe is generally designed to last about 20 to 50 years. In this region, collection system pipes and household laterals have frequently gone much longer than that without inspection or repair, which makes cracks and breaks likely rather than exceptional. Every crack in every lateral admits groundwater and stormwater into a system that overflows on a tenth of an inch.
So a cracked lateral here is not only your own backup risk. Repairing or lining it takes measurable load off the wider network. That is an unusual situation, and it is worth knowing, because it means a camera inspection and a repair are doing more than protecting one basement.
Lead, and the free half of the job
About a quarter of the water authority’s customers had lead service lines, and the replacement programme running since 2017 has removed a great many of them. More than 8,500 public lines and more than 5,000 private lines have been replaced, and the authority marked its 11,000th lead service line removal.
The practically important detail is this: if crews encounter a private lead line while replacing the public one, they replace both at the same time at no direct charge to the customer.
That turns knowing your own pipe into something with direct financial value. If your street is scheduled and your private line is lead, having that on record means the private side gets done while the crew is already there. Checking takes two minutes with a coin at the point where water enters the basement. Lead is dull grey and soft, scratches to a bright silver, and is not magnetic. Copper scratches copper-coloured and galvanized is threaded and magnetic.
Why the hills cost money
Pittsburgh’s terrain is the last piece, and it explains quotes that look high compared with what a friend in a flat city paid.
Steep hillsides, ravines and narrow streets make sewer repair and replacement dramatically more expensive here. Lines run at extreme grades down hillsides, under railroad tracks, across ravines and through retaining walls. Mount Washington, where streets reach 40 per cent grade, along with Troy Hill, Spring Hill and Polish Hill, are consistently among the most expensive neighbourhoods for this work.
None of that is a pricing decision. It is the physical difficulty of getting equipment to the line, working safely on a slope, and reinstating what had to be disturbed. It is also a strong argument for trenchless methods where the pipe’s condition allows them, since lining or bursting avoids opening a trench down a hillside. Every plumber we dispatch in Pittsburgh is licensed for work in the city and pulls the permits the job requires.
Pittsburgh housing and infrastructure
The local factors that most often determine what a plumber finds and how a repair is done here.
Private lead lines replaced free when crews are already there
If crews encounter a private lead line while replacing the public one, they replace both at the same time at no direct charge to the customer. That makes knowing your own line's material worth far more than it might seem.
The steepest streets in the country
Mount Washington has streets at 40 per cent grade, and Troy Hill, Spring Hill and Polish Hill are comparable. Those neighbourhoods are consistently the most expensive for sewer work for reasons of physics rather than pricing.
A consent decree and a multi-billion dollar plan
ALCOSAN is under a federal consent decree to address sewage reaching the rivers, and its Clean Water Plan is expected to cost more than 4.5 billion dollars. The Ohio River Tunnel is the first of three planned over the coming decade.
Your lateral is part of the public problem
Because household laterals may account for up to half of the water getting into the system, a cracked private line is not only your backup risk. Repairing it reduces the load on a system that is already overwhelmed by a tenth of an inch of rain.
Areas of Pittsburgh we serve
Neighborhoods and districts
- Mount Washington
- Troy Hill
- Spring Hill
- Polish Hill
- Lawrenceville
- Bloomfield
- Squirrel Hill
- Shadyside
- South Side
- Hazelwood
- Garfield
- East Liberty
- Highland Park
- Allegheny West
- Manchester
- Brighton Heights
- Beechview
- Brookline
- Carrick
- Sheraden
ZIP codes we serve in Pittsburgh
15201–15244, 15250–15255, 15257–15262, 15264–15265, 15267–15268, 15270, 15272, 15274–15279, 15281–15283, 15286, 15289–15290, 15295
From our approved service-area list. If your ZIP is not shown, call and we will check.
Nearby communities on our service list: Carnegie, Bethel Park, Monroeville, Homestead, Coraopolis, Sewickley, Verona, Braddock.
Plumbers near Pittsburgh
Other cities in the area with their own local plumbing pages.
Questions
Pittsburgh plumbing questions
Why does my basement back up when it barely rained?
Because the threshold here is very low. Pittsburgh's combined sewer system carries wastewater and stormwater in the same pipes, and as little as a tenth of an inch of rain can overload it. When it overloads, raw sewage backs up into basements and overflows into the three rivers. That is a system capacity problem rather than a blockage in your own line, so clearing your lateral will not prevent it. A backwater valve on the house drain closes when the sewer pushes back toward the house.
Can I get my lead service line replaced?
A large replacement programme has been running since 2017, with more than 8,500 public and more than 5,000 private lead lines replaced and the 11,000th line removed. About a quarter of the water authority's customers had lead lines to begin with. The detail worth knowing is that if crews encounter a private lead line while replacing the public one, they replace both at the same time at no direct charge to the customer. So knowing what your own line is made of, and telling the utility, can be worth real money.
How do I check whether my line is lead?
Find the pipe where water enters the basement, ahead of the meter, and scratch it gently with a coin. Lead is dull grey and soft, scratches to a bright silver, and a magnet will not stick to it. Copper scratches to a penny colour, and galvanized steel is threaded and magnetic. If it looks like lead, contact the water authority, because their records and their crews' schedule in your street both matter to what happens next and to what it costs you.
Why is a sewer repair so expensive in my hillside neighbourhood?
Terrain, not pricing. Pittsburgh's steep hillsides, ravines and narrow streets make sewer repair and replacement dramatically more expensive than the same job in a flat city. Lines run at extreme grades down hillsides, under railroad tracks, across ravines and through retaining walls. Mount Washington, with streets at 40 per cent grade, along with Troy Hill, Spring Hill and Polish Hill, are consistently among the highest cost areas for this work for straightforward physical reasons.
Is my sewer lateral likely to be in bad condition?
Statistically, quite possibly. Sewer pipe is generally designed to last about 20 to 50 years, and in this region collection pipes and household laterals have frequently gone much longer than that without inspection or repair, which makes cracks and breaks likely rather than exceptional. The EPA estimates that up to half of the inflow and infiltration problem in systems like this one may be due to house laterals. A camera inspection is the way to find out where yours sits in that range.
Does repairing my lateral actually help anything beyond my own house?
Yes, more than in most cities. Because household laterals may account for up to 50 per cent of the water getting into the sewer system, a cracked private line is not just a personal backup risk, it is part of what overwhelms the system. Repairing or lining a lateral that is admitting groundwater takes load off a network that already overflows on a tenth of an inch of rain. That is unusual: here your own repair genuinely contributes to the wider fix.
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