Clogged Main Sewer Line in Harrisburg: 5 Steps to Take Now

In Harrisburg the sewer line running out from under the house belongs to the property owner for its entire length, and Capital Region Water's homeowner guidance adds the one detail that changes how a clog gets handled here: most of those service lines have never been replaced, and a good number are between 100 and 150 years old. That is the most useful thing to know while the main drain is backing up, because the age of the pipe narrows down where the blockage sits, what is holding it there, and how anyone is going to reach it.

Key Takeaways: Most of These Sewer Lines Have Never Been Replaced

• Several fixtures at once: one slow sink is a fixture problem, but toilets, the tub and a basement floor drain going together puts the blockage in the shared line.
• The whole run is yours: the pipe from the building out to the connection at the sewer main is the property owner's to maintain, which is why the first call is to a plumbing company rather than to the utility.
• Age narrows the search: with service lines of 100 to 150 years under much of the city, vitrified clay and cast iron are what a cable is working in, and both give way at the joints first.
• Access is the real constraint: a row house with a wall shared on each side and no side yard commonly has nothing capped outdoors, and the way in is a plug set flush into the basement floor.
• Stop adding water: the washing machine and the dishwasher put a large volume into the line quickly, and they are what turns a slow main drain into water on the floor.
• Ask what the line looks like, not only whether it is open: a cable proves the pipe passes water today, and footage tells you whether it closes again in the same spot.
• Roto-Rooter is fully licensed and insured, clears main lines 24/7, 365 days a year, and has been doing this work since 1935.

While the Basement Floor Is Still Dry: Five Things to Do First

1. Shut down every source of water in the building, appliances included. A dishwasher on a timer or a washing machine mid cycle will empty into a line that has nowhere to put it, and neither one needs anybody in the room to do it.
2. Note which fixtures are affected and which are not. The lowest opening takes it first, so a floor drain or a basement toilet gurgling while the second floor behaves normally tells you the blockage sits below everything.
3. Go and find the access point before anyone arrives. Look at the basement floor near the front wall, and along the wall the plumbing stack runs down, for one or two round caps set flush into the concrete.
4. Keep people and pets off the floor if anything has surfaced. What comes back out of a main line is not a leak from a supply pipe, and it does not become safe because it looks thin.
5. Write down when it started and what came up first. If this has happened before, the gap between the two events is worth more to a technician than any description of how it looked.

A Sewer Line That Has Never Been Replaced Blocks in Predictable Places

Vitrified clay was laid in short lengths with mortared joints, and cast iron ran the first stretch out of the building. Neither material fails in the middle of a length. They fail at the seams, where a joint has opened a fraction under a century of settlement and freeze and thaw, and each of those openings is somewhere for grease to catch and fine roots to get a hold. That is why a household with no tree on the property can still have roots in the line, and why a blockage returns to the same place.

The ground does the pushing. Dauphin County sits in the Great Valley, with shale under much of the ground east of the river and carbonate rock through the valley floor, and seasonal movement in that soil works on a rigid pipe with mortared joints in a way it never works on a continuous plastic one. So a main sewer line clog in an older Harrisburg property is usually a joint problem rather than something put down a toilet.

Where a Cable Gets In When There Is No Side Yard and No Cleanout Outside

This surprises people who moved here from a detached house. Rows built before the Second World War share a wall on both sides and go straight out to the sidewalk, so there is no strip of lawn for a cleanout to stand in. Some of these houses have a capped riser in the small rear yard or out toward the alley. Many have nothing outdoors at all, and the access is indoors: one plug, or a pair set a short distance apart, in the basement floor. A pair usually means a running trap, an older arrangement that gives a cable two directions to go.

If nothing has ever been capped, a ground floor toilet can be lifted off its flange to give a straight run into the line, and that is a routine part of the work rather than a last resort. Knowing which of the three you have changes which room the work starts in. It matters again later: any excavation crossing the sidewalk or the roadway needs a street opening permit from the city's public works department, which makes a repair a scheduled job rather than a same-evening one.

The Question to Settle Once the Main Line Is Open Again

A cleared line and a sound line are two different findings, and this visit is the cheapest chance to tell them apart. A camera run down the same access point answers three things a cable cannot: how far out the trouble sits, whether the pipe changes material partway, and whether what was cleared was a blockage in sound pipe or a symptom of an open joint. On a line of this age the last of the three decides whether you are booking this again next year.

Ask for the distance and the depth to be written down and for the footage to be kept. If the finding is an opened joint, the choices are a clearing on a set interval, a lining of the affected length, or replacing the run in PVC. Those are daylight decisions and none has to be made while the basement floor is wet.

If the main line turns out to be one part of a wider problem, Harrisburg drain cleaning covers the branch lines that feed it.

Row Houses, House Traps and Main Line Clogs: Frequently Asked Questions

Our house shares a wall on both sides. Does that mean we share the sewer line too?

Usually not. Attached houses on a row were normally given their own lateral out to the sewer main, even though the buildings touch. There are exceptions, mainly where two properties were once one or where a rear building was added later, and a camera locate settles it in minutes. If the run is shared, that changes who has to agree to any repair, which is better known beforehand than afterwards.

The basement floor has two brass caps set into it a foot or so apart. What are those?

That is almost certainly a running trap, and the two caps are the access points on either side of it. The trap was standard on houses of this era, it sits where the building drain leaves for the street, and it is a natural catching point, so plenty of main line blockages in older properties turn up within a few feet of those caps. Leave them closed and tell the technician they are there.

Capital Region Water says a service line here can be 150 years old. Does ours have to be replaced?

Not on age alone. Plenty of clay laterals that old still run properly because the bedding under them never moved much and the joints stayed tight. Age raises the odds that a joint has opened somewhere along the run, which is an argument for looking inside the pipe rather than an argument for digging it up. Replacement becomes the sensible answer when the footage shows a section that has dropped, separated or collapsed, not when the calendar says so.

Our line leaves the back of the house toward the alley instead of the street. Does the alley route change what the visit looks like?

It changes where the work happens more than what the work is. A rear lateral is reached from the back of the property or from an indoor access point, and the useful thing to establish beforehand is whether a vehicle can get down the alley and whether anything is parked over the run. Rear laterals tend to be shorter, which can make a locate quicker, and they can also cross ground that has been paved or built over since the pipe went in.

The washing machine is in the basement and it is the only thing that overflows. Why that one?

Because it discharges more water faster than anything else in the building, and it does it at the lowest point. A partly blocked main line can pass a sink or a shower and still be nowhere near able to take a drain cycle. If the washer is the only fixture giving trouble, the line is narrowed rather than clear, and that is the stage where the work is straightforward and nothing has reached the floor.

Does the age of the pipe change what the work involves, or only what it costs?

Both, and the two are connected. An older clay or cast iron line takes a different approach at the cable than a modern plastic one. Cost varies by the severity of the blockage, how far out it sits and the method the pipe will tolerate, so Roto-Rooter provides on-site estimates before any work begins rather than quoting a job nobody has seen inside yet.

Call Roto-Rooter, and Say How Old the House Is

Two details told at booking make the visit quicker: roughly when the building went up, and whether anything is capped outdoors. They decide which equipment comes off the truck and which room the technician starts in. Roto-Rooter has cleared main drains since 1935, is fully licensed and insured, and works 24/7, 365 days a year, so a line that stops moving on a Sunday evening does not have to wait for Monday. Start from Roto-Rooter of Harrisburg, and the Harrisburg emergency plumber team is the faster route once the line has reached the floor. Schedule online to put it on the calendar before the next heavy weekend.