Congers sits between Rockland Lake and the Lake DeForest reservoir with wetlands between them, and it has the highest water table in Clarkstown. The 1950s–60s ranches and splits along Lake Road and Route 9W take groundwater through the slab and the cove joint every spring, and sump pumps in the lowest streets run most of the year. The lake cottages that were winterized after the war sit on shallow foundations and crawl spaces that were never meant to be dry. Congers is where a basement without a working system simply does not stay dry, and where a finished basement without a drain under it grows mold on a schedule.
The fix is a serious interior system: full-perimeter drain, a large sump pit with a half-horsepower or larger cast-iron pump, a battery or water-powered backup (often both), a high-water alarm, and a discharge line long enough to get the water away from a house that is often sitting in it. A dedicated dehumidifier is part of the package. For the cottages, crawl space encapsulation with drainage underneath. Outside work helps but rarely solves Congers on its own.
Congers is in the Town of Clarkstown; slab-cutting systems are commonly permitted and the contractor applies. Every contractor needs the Rockland County home improvement license and insurance.
What waterproofing costs in Congers (2026)
| Job | Typical price |
|---|---|
| Foundation crack injection (epoxy or polyurethane) | $250 – $800 per crack |
| Sump pump installation (pit, pump, discharge) | $1,000 – $3,000 |
| Battery backup sump pump | $400 – $1,500 installed |
| Interior perimeter drain + sump (full basement) | $5,000 – $15,000 |
| Exterior excavation waterproofing | $10,000 – $30,000+ |
| Crawl space encapsulation | $3,000 – $15,000 |
| Grading, downspout extensions, window well covers | $300 – $3,000 |
| Basement waterproofing, typical project | $2,300 – $7,600 (avg. about $5,000) |
Ranges are published 2026 national figures (Angi's and HomeGuide's basement waterproofing cost guides for typical projects, interior French drain and exterior excavation ranges; HomeGuide and Angi sump pump and foundation crack repair pages; crawl space encapsulation figures from HomeGuide), not quotes from this site. Rockland quotes for interior drainage systems typically run in the upper half of national ranges. Details: Rockland waterproofing cost guide.
Services in Congers
Basement waterproofing
Interior drainage systems, sump pumps, wall vapor barriers and the outside fixes that stop water before it reaches the wall.
Interior vs. exterior systems →Sump pumps & backups
New pits and pumps, replacements, battery and water-powered backups, check valves and discharge lines that do not freeze.
Pump sizing & backups →Foundation crack repair
Epoxy and polyurethane injection for poured walls, block wall sealing and bowing-wall reinforcement with carbon fiber or anchors.
Which cracks matter →Crawl space encapsulation
Vapor barriers, drainage, sealed vents and dehumidification for the dirt crawl spaces under Rockland's older houses and additions.
What encapsulation involves →How it works
- Tell us about the job. Where and when the water shows up, whether the basement is finished, and whether there is a sump already. Photos help.
- We match you with a local pro. One independent waterproofing contractor, licensed in Rockland County and insured, that serves your town. We do not send your request to five companies.
- Get a free quote. They inspect inside and outside and quote in writing, with linear feet, pump, backup and warranty named. You decide; no fee and no obligation.
Congers questions
How much does basement waterproofing cost in Congers?
Full interior perimeter systems with a heavy-duty pump and dual backups typically land in the middle to upper part of the $5,000 to $15,000 range published for 2026 (HomeGuide, Angi); the high water table justifies the larger pit and pump. Crawl space encapsulation for a cottage, $3,000 to $15,000.
My pump runs constantly. Is that normal here?
In the wettest parts of Congers, nearly: the pit is draining the water table. A larger pit, a pump sized for continuous duty, a backup, and an alarm are the answer; a constantly running small pump is a pump about to fail.
Can I finish my Congers basement?
After a proper drainage system and with inorganic finishes (no paper-faced drywall against block, no carpet pad on slab), yes. Before that, finishing is money that will be torn out.
Request a free quote in Congers
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