Waterproofing South River basements along the river

Water gets into a South River basement one of two ways, and Middlesex Waterproofing starts every visit by working out which.

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On the east side, the river does the pushing. Up the hill, it is usually rain looking for a crack in an old wall.

Local record

Older than 1980: 75.1% of 5,754 homes; 19.8% date to 1939 or earlier (ACS 2024)¹
Sandy, Oct 29, 2012: Water up to 40 inches on Washington Street (borough recovery report)²
Tidal flooding: Begins along the South River in the minor range (NWS)³
Higher ground: Downer and Sassafras soils, not limited for basements (NRCS)⁴

Old houses on single-family blocks

Three quarters of the borough's housing predates 1980, by the Census Bureau's 2024 five-year estimates, and nearly one home in five was standing by 1939. Most are detached single-family houses, 74.7% of the total.

Walls that age have moved. Poured concrete shrinks and splits in thin vertical lines; block opens at the mortar joints. A vertical crack that weeps after rain is something we fix from inside, and crack injection fills it through ports set along its length. A crack that runs sideways, bows the wall or keeps getting wider is structural, and for that we tell you to call an engineer.

Vertical crack in a poured concrete wall with injection ports along it — Crack injection ports on a poured wall. AI-generated illustration

The river on the east side of town

The South River forms the borough's eastern and northeastern line, and the weather service lists it among the places tidal flooding starts. The borough's 2014 recovery planning report tells what Sandy did with that. Around 9 p.m. on October 29, 2012, surge and tide came over the banks. Water stood 28 inches deep on Reed Street and as high as 40 inches on Washington Street, and most homes east of Water Street took on several feet. About 200 homes and businesses ended up on the borough's substantially damaged list.

Some of those houses were bought and cleared. In the ones still lived in, what we tend to find is slower: a floor that never dries out, or a joint that seeps every time the ground fills up. We work out where it gets in, then seal that spot or carry the water to a pump.

Higher streets, sandy soil and surface water

Away from the river, the picture flips. Around the borough center, the NRCS soil survey maps mostly Downer and Sassafras soils mixed with urban land, and rates both not limited for basements. They drain. So a wet basement on those blocks points us first at gutters, short downspouts, a yard sloping toward the house, or a crack. If the water is coming up through a floor drain, that is a sewer backup and a plumber's call.

The levee that was designed but not built

Congress authorized an Army Corps project for this river in 2007: a surge barrier across it and two combined levees with floodwalls along the east and west banks in South River and Sayreville. The 2014 report says the design was finished and approved, yet nothing was built because Congress never funded construction, and that after the buyouts it might never happen. We have not checked where it stands today. A wall under your house will not wait for it either way.

Sources