A perimeter drain under the slab that collects groundwater and sends it to a sump pump, a common fix for Parsippany lower levels that seep at the floor joint.
In a lot of Parsippany split-levels and raised ranches, the leak shows up as a dark line where the block wall meets the slab, usually on the lower level after a long rain. An interior drain deals with that at the source. The contractor breaks out a strip of floor along the walls, sets perforated pipe in clean stone, and runs it to a sump pit. Water that would have come through the joint drops into the pipe and gets pumped out. A plastic wall membrane often goes up behind it so seepage running down the block ends up in the drain too.
Homes in the eastern lowlands, near the Rockaway River and the edges of Troy Meadows, tend to work their pumps hard because the water table can sit high for days after a storm. That makes the pump choice and a battery backup more than an afterthought. Ida dropped about five and a half inches on Parsippany in 2021, the kind of storm that brings both a high water table and a power outage. Ask your contractor about pump capacity, a sealed pit lid, and a high water alarm so you know if the pump falls behind.
Where the discharge ends up matters on Parsippany's smaller lots. A line that empties next to the foundation, or toward a neighbor's yard on a slope, just moves the problem. The contractor should run it far enough from the house to stay out of the backfill, keep the outlet from freezing in January, and follow township rules. Rules on sump discharge vary, so check with the Parsippany-Troy Hills building department. If you already have a pump that runs constantly, a contractor can check the float, check valve, and pit before suggesting a full new system.
Usually the bottom section of the wall finish and the flooring along the walls must be removed so the trench can be cut. Ask the contractor exactly how much will be opened up and whether putting it back is part of the quote.
It depends on how much water the pit collects. In low areas with a high water table, many owners add a battery backup or a second pump. Your contractor can watch how fast the pit fills during the inspection and size things to match.
Check with the Parsippany-Troy Hills building department before deciding. In general the line should carry water well away from the foundation and off your neighbor's property, and it should not be tied into the sanitary sewer without confirming the rules.
Lake Hiawatha sits on the Rockaway River behind a retaining wall built in 1986; in January 2024 residents petitioned to extend it further down River Drive.
patch.comHurricane Irene overtopped the Lake Hiawatha floodwall in 2011, and by 2017 the Morris County Flood Mitigation Program had bought out 20 flood-prone Parsippany homes.
morriscountynj.govAfter Hurricane Ida in 2021, flooding closed New Road and Edwards Road and blocked access to the rear of the Rutgers Village complex.
patch.comDigging along the foundation to seal the outside of the wall and add a footing drain, often used on the uphill side of sloped Parsippany lots.
Injection sealing for leaking cracks in poured walls, plus a closer look at cracks in the block foundations common in Parsippany's postwar homes.
Sealing damp crawl spaces under Parsippany additions, older cottages, and partial-basement homes with a heavy liner and humidity control.
Pumping out water, drying the space, and removing damaged materials after a storm, pump failure, or Rockaway River flooding in Parsippany.