Basement Waterproofing in Lower Merion, PA
After the July 2026 storms, a Lower Merion, PA commissioner put the summer in one line: "We get a 100-year storm every year." If your basement felt it, describe the water here, and this free referral service will hand your request to one independent local contractor for a visit and a written estimate.
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Fixing Basement Water in Lower Merion, PA
Lower Merion Township is home to 64,691 people (2025 Census estimate) and lies about 8 miles northwest of Center City in Montgomery County, meeting Philadelphia along City Avenue. Its permits, sewers and contractor rules are its own.
Commissioner Ray Courtney made that remark to the Inquirer after a July 2026 microburst flooded the Wyndon Apartments in Wynnewood. The township's 2018 stormwater plan had already flagged aging pipes and undersized infrastructure.
This site is a referral desk. It holds no township license or state registration, takes on no basement work and sets no prices. Contractors may buy advertising here; you are never billed or given anything for writing in.
Old Villages, Valuable Homes in Lower Merion, PA
Lower Merion grew from land in the 1682 Welsh Tract and became a township in 1713, and the Merion Friends Meeting House has held meetings since 1695. The Pennsylvania Railroad later lent the area its Main Line name, as villages such as Ardmore, Bala Cynwyd, Bryn Mawr, Gladwyne, Merion Station, Penn Valley and Wynnewood filled in along the tracks.
About 75% of homes are owner-occupied, and the median value is $810,400, the highest of the five townships on this site. When a basement is finished, a small leak can soak drywall, carpet and built-in shelving long before anyone notices.
- Baseboards that swell or stain. In a finished room, warped or darkened trim is often the first visible clue.
- A musty smell behind paneling. Trapped moisture can linger without any visible puddle.
- A sump that keeps cycling after the rain ends. It may be moving more groundwater than it was sized for.
What Local Contractors Do in Lower Merion, PA
In a large house it pays to pin down where water enters before anyone prices the whole perimeter.
- Crack repair. Injection for poured concrete walls; repointing for fieldstone that has lost its mortar.
- Leak repair. Window wells, pipe openings and the seam where an addition meets the original house can all let water through.
- Sump pumps. A first pit or a worn-out pump replaced, discharging outdoors and never into the sanitary sewer.
- Full waterproofing. An interior drain and sump, or exterior membrane work where the lot leaves room to dig.
- Drainage. Downspout extensions, regrading and yard drains on lots that slope toward the house.
For more, see the pages on sump pump installation and basement drainage.
Mill Creek, Microbursts and the Sanitary Sewer
Mill Creek rises in Villanova and Ardmore and runs about 6.6 miles to the Schuylkill near the Gladwyne interchange of I-76. Where it crosses Old Gulph Road, a gate shuts the ford in high water. Short, intense storms like July 2026's can drop rain faster than older pipes carry it off, and that water hunts for low ground, sometimes a basement wall.
The township's sewer-backup handout makes a point worth repeating: illegal sump pump connections into the sanitary sewer are a frequent cause of backups. If water or sewage rises from a floor drain, that is a sewer matter, not seepage. Report it to the Lower Merion Police non-emergency number, 610-649-1000; the Sewer Division keeps staff on call.
Two Contractor Credentials in Lower Merion, PA
Lower Merion issues its own contractor license, and the township stresses that it should not be confused with Pennsylvania's home improvement contractor registration. Anyone working here needs both. Plumbing counts as a mechanical trade, so whoever reroutes a sump line or sets a backwater valve needs a township license too.
Permits go through the Building and Planning Department, 610-645-6200, whose pages do not list sump or waterproofing permits by name, so the contractor confirms what your job needs. Philadelphia L&I has no role here.
Lower Merion, PA Costs: Size Drives the Number
These ranges are national; nobody publishes Lower Merion prices. Home value does not set the bill, but footprint and finished space do: a longer perimeter means more feet of drain, and finished walls may come down and go back up.
| Cost row | Figure | Source (year) |
|---|---|---|
| Typical basement waterproofing project | about $3,000 to $10,000 (average about $5,000) | Fixr national (2026) |
| Interior perimeter drain, per linear foot | $40 to $120 | Fixr national (2026) |
| Sump pump installation | $600 to $2,500 | Fixr national (2026) |
| Epoxy crack injection, per crack | $250 to $1,000 | Fixr national (2026) |
| Waterproof paint or sealant, per sq ft | $1 to $8 | Fixr national (2026) |
Ask for drain length, pump model and drywall work as separate estimate lines. The cost calculator gives a rough range.
A Simpler Start in Lower Merion, PA
- No chasing estimates. One request reaches one independent contractor who works in the township.
- A clear record. Ask for the township license, the state registration number and a current certificate of insurance, as the township advises.
- Room to reconsider. Pennsylvania generally allows 3 business days to cancel a home improvement contract.
- Free to use. The referral costs you nothing, and no prize, credit or perk comes with it.
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Enter your address below to see whether a contractor covers it. Unsure what kind of water problem you have? The wet basement checker asks five questions and suggests a starting point.
Questions About Lower Merion, PA Basements
My sump pump empties into a laundry sink drain. Is that a problem?
It can be. The township's handout names illegal sump connections to the sanitary sewer as a frequent cause of backups. A contractor can reroute the discharge outdoors; since that is plumbing, it belongs with someone holding a township plumbing license.
Who do I contact at night if a floor drain backs up?
Report it to the Lower Merion Police non-emergency number, 610-649-1000, which reaches the Sewer Division's on-call staff. Philadelphia's water department hotline does not serve Lower Merion.
Will my homeowners policy pay for a sewer backup?
Possibly not. The township's handout notes that basic policies usually exclude sewer backup, and seepage is often left out too. Read your policy and ask your insurer or agent about a sewer-backup endorsement.
Is a state registration enough to work in Lower Merion?
No. The township licenses contractors on its own terms, separate from the state registration, and publishes a list of firms holding its license, so you can check a name before signing.
More Towns Nearby
Other township pages include Upper Darby, PA, to the south in Delaware County, and Cheltenham, PA and Abington, PA, to the northeast in Montgomery County.
Request a Lower Merion, PA Estimate
Note the room, the wall and when the water appears, then fill in the form below. An independent contractor serving Lower Merion gets in touch to arrange a visit; reading its estimate leaves you under no obligation.