Foundation Repair and Basement Waterproofing in Lawrence, MA

Water

Where the water comes from in Lawrence

Combined sewers. Lawrence maintains 137 miles of sanitary and combined sewers, 41 miles of storm drain and four pump stations, and only about 30% of the system has separate sanitary and storm pipes; combined sewers are most common in the older parts of the city. Flows go to the Greater Lawrence Sanitary District plant in North Andover, and six combined sewer overflow outfalls are in that district's discharge permit. The city warns that blocked pipes can back raw sewage up into homes and that overflows show up as water coming out of manholes and catch basins and into basements (Wastewater Collection). In a house with that history, a sewer backup and groundwater seepage need different fixes, so tell the contractor which one you're seeing.

Sump pumps. We found no Lawrence rule on where a sump pump or roof drain may discharge. Statewide, MassDEP defines inflow to include flows from sump pumps connected to the sewer and requires local sewer regulations to prohibit inflow connections (MassDEP), and a public comment in MassDEP's response-to-comments document on its I/I guidelines notes that redirecting a sump can create an illicit discharge to local waters (MassDEP response to comments). Ask the Department of Public Works before choosing an outlet. The city also runs dye tests to trace illicit storm-drain connections, which can mean letting a crew use a sink or toilet in your home for about 10 minutes on a weekday (Water and Sewer notices).

Bigger site work. A Stormwater Management Permit is required to disturb more than one acre, and for any activity disturbing more than 5,000 square feet that will discharge to a combined sewer; the fee runs from $500 to $1,500 (permit application).

The Spicket River. The Spicket was channelized in 1910 to turn wetlands into buildable land, and later development in its floodplain made flooding more likely for nearby residents, according to the city DPW's Flood Vulnerability Assessment and Adaptation Plan, presented at a public meeting on February 16, 2021 (project flyer). The state's case study on that work says the river has had several large historic floods, that the Mother's Day flood of 2006 inundated most of the Auburn Street DPW yard between Hampshire and Bennington Streets, and that the city mapped flooding for current conditions and for 2070 (MVP case study). The Merrimack runs through the center of the city, with the Spicket to the north and the Shawsheen to the south, and the eastern part of the Common was once an alder swamp that was drained and filled (state historical survey). Look up your address on FEMA's Flood Map Service Center; flood insurance doesn't cover finished basement walls, floors or most belongings (FEMA).

Wetland and floodplain buffers. Lawrence's wetland protection regulations, posted as a March 2017 revision, set a 100-foot buffer around wetland resource areas with a 25-foot no-disturbance zone and a further 25-foot no-build zone, and treat excavating soil or changing drainage or the water table as altering a resource area (Wetlands Protection Ordinance). Exterior waterproofing on a lot near the river can fall under it.

Radon

Radon testing in an Essex County basement

We found no Lawrence radon figures. Essex, Middlesex and Worcester are the Massachusetts counties where new one- and two-family homes must have a passive radon mitigation system, and the state publishes residential test results by city and town (radon tracking). State health guidance we checked in November 2026 says to test at the lowest livable level of the home between November 1 and March 31, strongly recommends mitigation at 4.0 pCi/L, and says it should be considered between 2.0 and 4.0 (testing your home for radon).