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Once the water has somewhere to go, everything changes. That damp smell in the basement disappears. The walls stop showing moisture stains. The sump pump that used to run every time it rained finally gets a break. You get usable square footage back — and in a Bala Cynwyd home worth close to or over a million dollars, that matters more than it would almost anywhere else in Pennsylvania.
A lot of homes in this area were built in the 1920s and 1930s, when drain tile systems were either basic or nonexistent. Decades of Schuylkill River proximity, clay-heavy soil, and Philadelphia-area rainfall — about 46 inches a year — have done their work on those original foundations. The problem isn’t that your house is old. It’s that it was never set up to handle what the ground around it is actually doing.
Getting this fixed also protects your investment long-term. Water intrusion that goes unaddressed leads to mold, structural deterioration, and real damage to a home you’ve put serious money into. A properly installed french drain system lasts 30 to 40 years. The cost of not installing one tends to be much higher.
We’ve been working on homes across Montgomery County for nearly 20 years, and that includes a lot of pre-war twins, stone colonials, and mid-century homes — exactly the kind of housing stock that defines the streets throughout Bala Cynwyd and Lower Merion Township. We know what original drain tile failure looks like in a 1930s basement. We know what the soil conditions near the Schuylkill do to foundations over time. This isn’t a new market for us.
What sets EJS Environmental Services apart from every other drainage contractor currently serving Bala Cynwyd is straightforward: we’re a certified environmental services firm, not just a waterproofing company. That means before anyone starts excavating near your foundation, we can test for lead paint, asbestos, and mold — the hazards that are genuinely common in homes of this age. No other French drain contractor in this area holds EPA-certified lead inspector credentials. Most don’t even ask the question.
We’re fully licensed, bonded, and insured at the environmental services level. Free estimates, cash discounts, and 24/7 availability are part of how we operate — not perks we advertise and quietly walk back.
It starts with a free on-site estimate. We come out, look at where the water is entering, assess the soil and grade around the foundation, and figure out whether an interior french drain, an exterior french drain, or a combination of both makes the most sense for your specific situation. For homes in Bala Cynwyd, we also factor in Lower Merion Township’s stormwater management code — which has specific requirements about where drainage outlets can discharge and what documentation the township may require. Getting that right upfront keeps you out of permit trouble later.
Before any excavation begins, we assess for environmental hazards. If your home predates 1978 — which describes the majority of the housing stock in Bala Cynwyd — we check for lead paint on foundation walls and asbestos on any pipes or insulation in the excavation zone. If something’s there, we handle it. That’s not a separate contractor you have to find and schedule. It’s part of what we do.
The installation itself uses rigid perforated PVC pipe, clean crushed stone, and geotextile filter fabric — the materials that actually last. We set the pipe at the correct slope so gravity moves the water where it needs to go, and we design the outlet point to meet township requirements. When the job is done, we clean up completely. HEPA filtration is used throughout any work involving potentially hazardous materials, so what we leave behind is a functioning drainage system — not a mess.
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A french drain is only as good as what goes into it. The difference between a system that lasts 35 years and one that clogs and fails in five usually comes down to three things: the pipe material, the surrounding aggregate, and whether filter fabric was used correctly. We use rigid perforated PVC — not the flexible corrugated tubing that’s cheaper to buy and faster to install but collapses under soil pressure over time. We use clean #57 crushed stone around the pipe, not native fill that carries fine particles straight into the drain. And we wrap everything in geotextile filter fabric that keeps soil out while letting water through.
For exterior french drain work in Bala Cynwyd, the dense residential lots and mature landscaping on most streets mean the job requires more care than a wide-open suburban yard. We work within tight spaces, protect existing landscaping where possible, and coordinate the outlet point so it complies with Lower Merion Township’s rules about discharge onto adjacent properties. Yard drainage on these lots isn’t just a dig-and-fill job — it requires real planning.
We also handle french drain cleaning and maintenance for existing systems that are underperforming. If you have an older drain that’s backing up or a sump pump that’s working harder than it should, that’s often a sign the system needs to be cleared or partially replaced — not necessarily fully redone. We’ll tell you honestly which one applies to your situation.
It depends on the scope of the work, but Lower Merion Township takes stormwater management seriously — more so than many surrounding municipalities. The township operates under Chapter 121 of its code, which governs stormwater and erosion control. If your project involves altering an existing drainage outlet or directing water in a way that affects neighboring properties, there are specific approval requirements involved. You can’t simply redirect concentrated stormwater discharge onto an adjacent property without written approval from the affected owner.
For most standard residential french drain installations in Bala Cynwyd, the permit requirements hinge on whether you’re adding impervious surface or modifying existing drainage infrastructure in a way the township considers a material change. The safest approach is to work with a contractor who already knows this code and pulls the appropriate documentation before the job starts. That’s standard practice for us in Lower Merion Township — it protects you at inspection and at resale.
The honest answer is that it varies based on the length of the drain run, whether the work is interior or exterior, what the soil and access conditions look like, and whether any environmental hazards need to be addressed before excavation. For a typical residential french drain installation in Bala Cynwyd, you’re generally looking at a range somewhere between $3,000 and $12,000 depending on those factors. More complex exterior systems on tight lots — which is common in Bala Cynwyd’s dense residential neighborhoods — tend to run toward the higher end of that range.
What’s worth keeping in mind in this specific market is the ROI framing. With median home values in Bala Cynwyd approaching $1.1 million, the cost of a properly installed drainage system is a modest figure relative to what you’re protecting. FEMA data puts the average water damage claim at around $15,000 — and that’s before you factor in mold remediation, structural repair, or the impact on resale value. The free estimate we offer gives you an exact number before you commit to anything.
An exterior french drain is installed around the perimeter of the foundation on the outside of the home. It intercepts groundwater before it reaches the foundation wall, which makes it the more comprehensive solution when the goal is to keep water from ever making contact with the structure. The tradeoff is that exterior installation requires excavation down to the footing, which is more disruptive and more expensive — and in a pre-war Bala Cynwyd home, it also means a higher likelihood of encountering lead paint, asbestos pipe insulation, or other hazardous materials that need to be assessed before the dig begins.
An interior french drain is installed inside the basement, typically along the perimeter at the base of the wall. It doesn’t stop water from entering the wall, but it captures and redirects it before it can pool or cause damage. Interior systems are less disruptive to install and work well when exterior excavation isn’t practical — which is often the case on the tight, mature lots common throughout Bala Cynwyd. In many situations, the right answer is a combination of both, and we’ll tell you which approach actually fits your home after we see it in person.
This is exactly the right question to ask, and the fact that most drainage contractors don’t bring it up is a real problem. Homes built before 1978 — which includes virtually every home in Bala Cynwyd’s oldest neighborhoods — may have lead-based paint on foundation walls, lead-contaminated soil in the excavation zone, or asbestos insulation on original pipes that could be disturbed during trenching. None of those materials are dangerous if left undisturbed. They become a hazard when someone starts digging without testing first.
We hold EPA-certified lead inspector and risk assessor credentials — a federal designation that no standard waterproofing contractor in this market holds. Before excavation begins on any pre-war or pre-1978 home in Bala Cynwyd, we assess for these hazards. If something is present, we handle it in-house using proper containment protocols and HEPA filtration. You don’t need to find a separate environmental contractor and coordinate two separate projects. We do both, and we do them in the right order.
Not every wet yard or damp basement needs a full french drain installation — and we’ll tell you that upfront if it’s true. Some situations are better addressed with regrading, downspout extensions, or a sump pump upgrade. But there are specific signs that point clearly toward a french drain being the right fix. If water is pooling in the same spots in your yard after every rain, if your basement walls show consistent moisture intrusion along the base, if your sump pump runs constantly during wet weather, or if you’re seeing efflorescence — those white mineral deposits — on your foundation walls, those are reliable indicators that hydrostatic pressure is the core issue.
In Bala Cynwyd specifically, the combination of river-adjacent groundwater, clay-dominant soil that holds water instead of draining it, and an older housing stock with original or failed drain tile systems means a lot of homes here are dealing with exactly this pattern. The Schuylkill doesn’t have to be flooding for the water table near it to be pushing against your foundation. A site visit gives us a clear picture of what’s actually happening — and the estimate is free either way.
We offer cash discounts on qualifying jobs. In a market like Bala Cynwyd, where project costs on older homes can run higher due to environmental assessments, tight lot access, and the material standards we hold ourselves to, a cash discount is a straightforward way to reduce the total cost without cutting corners on the work itself. It keeps the transaction simple on both ends, and we pass that savings directly to you.
Beyond that, the free estimate itself is something worth mentioning — not as a formality, but because it means you get a fully detailed breakdown of what the job involves and what it costs before you make any decision. No vague quotes that expand after the work starts, no pressure to sign the same day. For a home and a neighborhood with the kind of investment value that Bala Cynwyd carries, you deserve to know exactly what you’re getting into before the first shovel hits the ground.
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