Common questions about basement waterproofing
- Is it worth it to do exterior waterproofing of a home, and will it stop cracks and leaking in a basement?
- Is moisture seeping through a basement’s walls a sign that
- My dehumidifier is collecting 6 gallons of water per day from my basement. Is that normal, and what does it mean?
- Should I install a French drain to deal with water in my basement?
- Should I waterproof my basement after finishing?
- What are effective ways to dry the basement after flooding?
- What are some alternatives to having a sump pump in the basement of a home?
- What are the best water-powered sump pumps?
- What are the issues that are caused by a wet basement?
- What are the uses of a French drain?
- What are the ways to stop water seepage in a basement?
- What can I do when my neighbor discharges sump pump water onto my property?
Hampton basement waterproofing — local context
Hampton's water problem comes from the ocean, not just the sky. The town wraps around the Hampton-Seabrook Estuary — which NH Audubon calls, at "roughly 5000 acres, the largest contiguous area of salt marsh and tidal flats in New Hampshire." That tidal marsh pushes the seasonal water table up with the tides and storm surge, so basements near Hampton Beach and Hampton Harbor stay under hydrostatic pressure even in a dry stretch. The exposure is mapped: per Hampton's Conservation Coordinator citing the FEMA Flood Insurance Rate Maps, "31% of Hampton is located in High Risk Flood Zones & 61% is located in the 100-year Floodplain," including 254.2 acres of coastal high-hazard Zone VE (wave action plus surge). Those FIRMs took effect January 29, 2021 per NH DES. We answer a sea-fed water table with our full-perimeter Forever Dry waterproofing system — interior drain, half-horsepower sump pump with battery backup, wall barrier and dehumidifier. Basement waterproofing runs $3,000–$30,000, priced to your home.
What a recent customer said
"With the crazy wet weather and super high water table this year. Had water just seeping in through the Wall/Floor Joint in basement, that would just NOT stop. Have not had this type of issues in the 30+ years at our house... But was leaking in at several points along a 30ft wall. 603 Basement was just a bit more. BUT they put in their patented Channel solution along the entire base of the wall, along with Sump Pump And let me tell you.. IT really worked. Also the Sump Pump they quoted was 1/2HP and much larger, vrs he 1/3rdHP others quoted. Also came with External 12volt back up battery for when power goes out, etc... First Class outfit. And I will never have to spend Days and Hours with Pumps and wet vacs in my basement anymore."
— John Weber, 5 stars (Google)
Frequently asked questions
Why do Hampton, NH basements flood even when it hasn't rained much?
Because Hampton sits on the Hampton-Seabrook Estuary — at roughly 5,000 acres, the largest contiguous salt marsh and tidal flats in New Hampshire per NH Audubon. The tidal marsh and Atlantic raise the seasonal water table with the tides and storm surge, so groundwater pressure against your foundation isn't only driven by rainfall. That hydrostatic pressure pushes water through wall and floor joints regardless of the forecast.
Is my Hampton home in a FEMA flood zone?
Quite possibly. Citing the FEMA Flood Insurance Rate Maps, Hampton's Conservation Coordinator reports that 31% of Hampton is in High-Risk Flood Zones — including 254.2 acres of coastal high-hazard Zone VE — and 61% is in the broader 100-year floodplain. The current Rockingham County coastal FIRMs became effective January 29, 2021 per NH DES. Check your parcel against those maps; a high-risk designation makes a waterproofing and drainage plan more important, not less.
What does 603 install for a coastal Hampton water table?
Our full-perimeter Forever Dry System: an interior drain along the base of the wall, a half-horsepower sump pump (one per ~120 feet) with an external battery backup for power outages during coastal storms, a wall barrier and a dehumidifier. Basement waterproofing runs $3,000–$30,000 depending on the size of the home and the scope of the system.
Basement Waterproofing in nearby New England towns
More 603 services in Hampton
- Basement Finishing in Hampton, NH
- Crawl Space Encapsulation in Hampton, NH
- Foundation Crack Repair in Hampton, NH
- Radon Mitigation in Hampton, NH



