914 Sump Pumps & Backup in Larchmont & Mamaroneck, NY
Larchmont and Mamaroneck are old and flood-conscious: the typical Larchmont home was built around 1940 (90% before 1980) and the typical Mamaroneck village home around 1953. Mamaroneck publishes its own flood-preparedness handbook. Storms that bring heavy rain often bring power outages, which is when pumps are needed most and most likely to fail. A battery backup or water-powered backup, plus a discharge line that sends water well away from the house, are worth discussing for any home that relies on a pump. Plumbing work in Westchester can require a county trades license in addition to a home improvement license; see our licensing guide.
Sump pumps companies for Larchmont & Mamaroneck
How we pick: we list up to six companies per page. Independent firms come first, then firms based outside Westchester, then franchise or network affiliates. Companies that name the town as served come before those that serve the whole county. Listings are free, not paid, and not an endorsement. Home improvement license status was looked up in the Westchester County consumer license search on Oct 26 to 27, 2026, plumber license status in the county trade license search on Oct 27, 2026, and NYS mold license status in the state Labor Department data set; each profile shows what we found.
AMHAC (All Makes Heating & Air Conditioning)
No rating collected yetSump pump installation and repair; plumbing, heating and air conditioning
Avellino Construction
No rating collected yetBasement, foundation, chimney and exterior-wall waterproofing; masonry and roofing; 24-hour emergency service
Bombace Construction Co., Inc.
No rating collected yetYard drainage, curtain and French drains, dry wells, catch basins, sump pump installation, grading, retaining walls
De La Paz Masonry
No rating collected yetWaterproofing, French drains, sump pumps, masonry
Kellets Anchored Home Improvement
No rating collected yetExterior and interior waterproofing, drainage, crack repair, sump systems, foundation repair coordination
MJ Plumbing Contractors & Son
No rating collected yetPlumbing and sump pumps
Plumbing licenses
Westchester County issues plumbing licenses separately from home improvement licenses, through its trade licenses search. We searched that database on Oct 27, 2026. Where a company or its plumber appears there, the license number is shown on its profile. A name that is not found means only that we found no record under that name, so ask any company that installs or connects a sump pump who does the plumbing and confirm that license number with the county. Work outside the building, such as a yard drain, is often not plumbing work, and rules vary by town.
Housing in Larchmont & Mamaroneck
| Place | Typical year built | Built before 1950 | Built before 1980 | Median home value |
|---|---|---|---|---|
| Larchmont | 1940 | 63.5% | 89.7% | $1,635,500 |
| Mamaroneck | 1953 | 44.2% | 78.4% | $717,200 |
Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25035, B25034, B25077), retrieved Oct 2026. Estimates carry a margin of error.
Flooding and water in Larchmont & Mamaroneck
- Westchester County’s Long Island Sound watershed program lists this municipality in the watershed study areas for “Blind, Beaver Swamp and Brentwood Brooks; Milton and Port Chester Harbors”, “Mamaroneck and Sheldrake Rivers; Mamaroneck Harbor”, “Pine and Stephenson Brooks; Larchmont Harbor”. [source]
- The Village of Mamaroneck describes itself as especially prone to flooding, sitting at the junction of the Mamaroneck River, the Sheldrake River, Beaver Swamp Brook, three watersheds, a 250-acre underground aquifer and Long Island Sound. [source]
- The state’s Mamaroneck River study found repeat flooding driven by undersized bridges and channels and tight development along the banks. [source]
- In Ida (September 2021), news reports described up to 14 feet of water in some Mamaroneck neighborhoods and basements filling to the first floor. [source]
Permit notes for Larchmont & Mamaroneck
From the municipality’s own pages, retrieved Oct 2026. Rules change, so call the building department before work starts.
- Larchmont: new sump pumps and drainage facilities need village permits; discharge should go to an owner-maintained dry well or detention basin. Discharging onto sidewalks or streets is not permitted and sump pumps may not connect to the sanitary sewer. [source]
- Mamaroneck: Local Law 2-2024 requires a plumber’s certification, by a plumber licensed to do business in Westchester County, covering sump pump discharge and sanitary sewer laterals. [source]
What it costs
A modeled White Plains estimate puts sump pump work at $840 to $3,673, with a midpoint near $1,574 (RenoVetted). Nationally, HomeGuide cites $600 to $2,500 for installation including the unit, and $400 to $700 to replace an existing pump. Jobs that need a new pit cut into a concrete slab, a battery backup or a longer discharge run cost more. Full cost guide with sources.
Frequently asked questions
How many sump pumps companies serve Larchmont & Mamaroneck?
We show 6 of 15 companies we found for Larchmont & Mamaroneck: 12 name Larchmont & Mamaroneck as an area they serve, and the rest serve all of Westchester County. Always confirm a company covers your address.
Does Larchmont & Mamaroneck require a permit for this work?
Often yes. See the permit notes on this page, then call the Larchmont & Mamaroneck building department before you sign a contract.
How long does a sump pump last?
It depends on the pump and how often it runs. Pumps in wet basements that cycle frequently wear out sooner. Test yours every few months by pouring water into the pit.
Do I need a backup pump?
If your basement takes water whenever the pump stops, a backup is cheap insurance against an outage or a stuck float switch.
Nearby
Sources
- Westchester County Planning: Long Island Sound Watershed Program (watershed study areas by municipality)
- Village of Mamaroneck Building Department: Flood Preparedness Handbook
- NYS DEC / Village of Mamaroneck: Mamaroneck River Flood & Resiliency Study Report (2023)
- ABC7 New York: Ida damage, 14 feet of water in Mamaroneck (Sept. 2, 2021)
- Village of Larchmont Building Department: Sump Pumps
- Village of Mamaroneck: Local Law 2-2024 (plumber’s certification for sanitary sewer laterals)
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, tables B25034, B25035, B25077 (via Census Reporter)
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