Westchester County
Mold Removal in Ardsley, Where the Flood Map Is Out of Date
Ardsley is the rare place where the flood map may be wrong in your favor, and that is worth knowing before you write off a basement or accept what an insurer quotes. The village told the county its maps do not reflect reality because the Army Corps of Engineers built a flood control wall here in the 1980s that substantially lowered the real base flood elevation along the Saw Mill River and at Addyman Square, and the maps were never revised.
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Two flood corridors, a 1950s basement, and who fixes what in Ardsley
The map being generous does not mean the village is dry, and the two flood corridors behave differently. Along the Saw Mill River flooding has been substantially reduced since the 1980s wall, and along the Sprain Brook a completed project re-channeled the brook and built a vegetative wetland retention pond. Underneath both, the village reports unresolved drainage: a low spot in the Summit Avenue neighborhood where stormwater accumulates and spills onto neighboring properties, the Cross Road subdivision needing mitigation, and the stormwater components of the Addyman Square flood control degrading over time. Three properties have been mitigated in recent years and all three were paid for privately, so nobody here should be waiting for a public fix at their own address. The deep claim history is mostly historic, 283 paid claims and 28 repetitive loss properties against just 24 policies in force, with 253 claim records in the 10502 ZIP code, and that pattern fits a village that got a flood wall. What is not historic is Ida: the village reported damage in areas not known for flooding at all, on Almena Avenue running north to Carrier Avenue, at Agnes Circle near Abington, on Park Avenue and on Summit Avenue, which is why an address with no flood story is no longer a reason to skip a look. The buildings change the answer too. Ardsley has the youngest stock on this site, only 193 of 1,728 homes built in 1939 or earlier against 715 built in the 1950s, and 1,234 are single family detached, so the typical problem here is a mid century poured foundation under a finished basement rather than a pre-war stone cellar, and the remedy is different. One last scheduling point: the state register shows an assessment contractor licensed at an Ardsley address and no remediation contractor, so the removal half comes from outside the village.
Areas within Ardsley: Addyman Square, Almena Avenue, Agnes Circle, Park Avenue, Summit Avenue, Cross Road
Flooded in a part of Ardsley that never floods?
Four streets did in one 2021 storm and the village said so. Tell us where you are and what came in.
What we arrange in the Village of Ardsley
Mold Inspection and Assessment
Get a written finding on what the mold is, how far it runs and what water is feeding it, from a licensed assessor who is barred by New York law from selling you the removal.
Mold Assessment in Ardsley →Mold Remediation and Removal
Have the mold removed properly, by a licensed remediation contractor working to an independent assessor's written plan and stopping at an independent clearance.
Mold Remediation in Ardsley →Water Damage Drying and Dry Out
Get the building dry before mold becomes the problem, after a leak, a backed up drain or water in the basement.
Water Damage Drying in Ardsley →What Ardsley's 283 paid claims and one flood wall add up to
Asked whether its flood hazard maps adequately address the flood risk, the Village of Ardsley answered no, explaining that the Army Corps of Engineers built a flood control wall in the village in the 1980s which substantially lowered the actual base flood elevation on properties along the Saw Mill River and in Addyman Square, but that the flood maps were never revised, so they show a base flood elevation substantially higher than what has actually been experienced since the wall was built.
Source: Westchester County Department of Planning, accessed 2026-09-21
The Village of Ardsley reported that the remnants of Ida caused damage in areas not known for flooding, naming Almena Avenue from around 551 Almena north to Carrier Avenue, Agnes Circle near the intersection with Abington, Park Avenue from 5 to 17 Park Avenue, and Summit Avenue.
Source: Westchester County Department of Planning, accessed 2026-09-21
The Village of Ardsley annex to the Westchester County Hazard Mitigation Plan records 24 flood insurance policies in force, 283 paid claims, $2,196,018.39 in total loss payments and 28 repetitive loss properties, on FEMA data dated July 2021.
Source: Westchester County Department of Planning, accessed 2026-09-21
The Village of Ardsley described two main flood corridors, the land adjacent to the Saw Mill River, where flooding has been substantially reduced since the 1980s flood wall, and the area adjacent to the Sprain Brook, where a completed project re-channeled the brook and built a vegetative wetland retention pond, and reported that three properties have been mitigated in recent years, all with private funds.
Source: Westchester County Department of Planning, accessed 2026-09-21
The Village of Ardsley reported that a low spot in the Summit Avenue neighborhood combined with inadequate drainage causes stormwater to accumulate on Summit Avenue and minor flooding on neighboring properties, that the Cross Road subdivision requires flood mitigation, and that the stormwater components of the Addyman Square flood control have degraded over time.
Source: Westchester County Department of Planning, accessed 2026-09-21
FEMA's National Flood Insurance Program claims database holds 253 claim records reported in ZIP code 10502, which covers Ardsley, of which 5 carry a date of loss in the first days of September 2021.
Source: US Federal Emergency Management Agency, accessed 2026-09-21
The American Community Survey five-year estimates for 2020 to 2024 count 1,728 housing units in Ardsley, of which only 193, about 11 percent, were built in 1939 or earlier while 715, about 41 percent, were built in the 1950s, and 1,234, about 71 percent, are single family detached houses.
Source: US Census Bureau, American Community Survey, accessed 2026-09-21
The New York State register of mold licenses shows 1 active mold assessment contractor license and no active mold remediation contractor license at an Ardsley address, and the same pattern inside ZIP code 10502.
Source: New York State Department of Labor, via data.ny.gov, accessed 2026-09-21
The Town of Greenburgh contains six incorporated villages, Ardsley, Dobbs Ferry, Elmsford, Hastings-on-Hudson, Irvington and Tarrytown, plus the unincorporated area, and the county hazard mitigation plan gives the town and each village its own separate annex and floodplain administrator.
Source: Westchester County Department of Planning, accessed 2026-09-21
Tell us what the finished basement looks like now
We will say whether the finish has to come out or whether drying it properly is enough. No obligation.