Common questions about basement waterproofing
Concord basement waterproofing — local context
If your Concord basement keeps getting wet, the cause usually starts with the rivers under your feet. Concord sits where the Sudbury and Assabet Rivers meet at Egg Rock to form the Concord River, which drains a basin of about 377 square miles (Wikipedia, citing the USGS National Hydrography Dataset). These are slow, low-gradient rivers with large floodplains, classic signs of a wide, high-water-table valley (OARS, "Past and Present Geology of the Sudbury, the Assabet, and the Concord Rivers"). The ground here is thick glacial stratified drift — sorted gravel, sand, silt, and clay deposited by meltwater and former glacial lakes (USGS surficial-geology mapping of the Concord quadrangle, OFR 2006-1260-A). That permeable outwash channels groundwater straight at your foundation, and disturbed backfill holds water against the wall. Concord also takes part in the NFIP, with FEMA flood maps marking hazard areas along the river corridors (Town of Concord). Our Forever Dry System pairs a full perimeter drain and sump with a vapor barrier to move that water out. Waterproofing runs $3,000 to $30,000, priced to your foundation.
What a recent customer said
"This past winter, I purchased a small cottage in the Lakes Region of New Hampshire and, when the spring thaw hit, the basement flooded. I knew the water table was high in the neighborhood in which the cottage was located but I thought the sump pump in place would keep water intrusion to a minimum. When that did not prove to be the case, I got several estimates for basement waterproofing and settled on 603 Basement Solutions. The company did amazing work, installing their signature sump pump (a quiet workhorse), a dehumidifier with battery backup, and a trenching system around the basement perimeter, for a reasonable price that beat the other estimates, along with a waterproof guarantee. That basement is dry as a bone and has been ever since they completed their work! 603 Basement Solutions was efficient and professional every step of the way. Well worth the money!"
— Susan Richey, 5 stars (Google)
Frequently asked questions
Why do Concord, MA basements flood in spring?
Concord sits in the Sudbury-Assabet-Concord river valley, where the Sudbury and Assabet Rivers join at Egg Rock to form the Concord River (Wikipedia, citing USGS data). These are slow, low-gradient rivers with large floodplains and a high seasonal water table (OARS). When spring rain and snowmelt raise that water table, groundwater pushes up through the permeable glacial soils and into the basement. A full perimeter drainage system with a sump pump intercepts that water before it reaches the slab.
What kind of soil sits under Concord homes, and why does it matter for waterproofing?
Much of Concord rests on thick glacial stratified drift deposited by glacial Lakes Concord and Sudbury. The USGS (Open-File Report 2006-1260-A) describes these deposits as sorted gravel, sand, silt, and clay laid down by flowing meltwater. That permeable sand-and-gravel outwash channels groundwater toward foundations, and disturbed backfill around the wall drains slowly and holds water against it. Interior perimeter drainage tied to a sump is built to handle this kind of high-groundwater soil.
Is my Concord home in a flood zone, and does that change waterproofing?
Concord takes part in the National Flood Insurance Program, and FEMA flood maps designate Special Flood Hazard Areas along the Sudbury, Assabet, and Concord river corridors (Town of Concord). You can check your own address on the town's FEMA flood map page. Even outside a mapped flood zone, a high water table in this river valley can soak a basement, so a guaranteed perimeter drainage and sump system is the reliable fix.
Basement Waterproofing in nearby New England towns
More 603 services in Concord
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