North Shore, the middle and the South ShoreGround or house, settled first(315) 640-3590
$100 off your first job, credited by us. Terms apply.

Nassau County

Mold Removal in Manhasset, NY, for Homes Built Before the War

An assessment of a Manhasset house tells you whether the damp is the building's own age showing, and which licensed trade fixes it, before any money goes on waterproofing. Nearly half of Manhasset's homes, 47.3 percent, were built in 1939 or earlier, and the one USGS well inside the hamlet read the water table 66.21 feet below the surface.

Start Your QuoteCall (315) 640-3590
1955is the median year built across Nassau County's 479,044 homes in Census estimates for 2020 to 2024
0.37 ftbelow the surface was the water table at a USGS well on Manhasset Neck in spring 2016
165.27 ftbelow the surface was the water table at a second Manhasset Neck well about 1.3 miles away
Get In Touch

Request a quote in Manhasset

Tell us the town, the lowest level of the house and where the damp is showing. In Nassau that is usually enough to say whether the water is coming up from the ground or out of the house, and which licensed trade the job needs.

Would you rather talk it through? Call (315) 640-3590.

$100credit

$100 off your first job

Credited by us on your first booked job.

  • One credit per customer per property, on your first booked job.
  • Valid through December 31, 2026.
Start Your Quote

Mention this offer when you book. Full terms.

Six quick questions about the house and where the damp is showing, then your details. It takes about a minute.

Question 1What are you dealing with?
Question 2Which part of the county is the house in?

How far down the water sits under a Nassau house changes a great deal from the South Shore to the North Shore hills. Near the bays and harbors it can be close to the surface. Under much of the middle of the island and the hills it is far below the floor, so damp there usually comes from the house itself. The town is enough, and not sure is a fine answer.

Question 3What is the lowest level of the house?

A house built on a concrete slab, a house with a basement and a house over a crawl space get wet in different ways, and the fix is different for each. Many homes in this county were built on slabs with no basement at all.

Question 4Where is it showing up?

Where the damp appears is the first clue to which way the water came. Damp that starts low and spreads up points one way, and damp around a fixture, a window or a ceiling points another.

Question 5How long has this been going on?

Something that got wet in the last day or two can often still be dried. Something that has stayed damp for weeks usually cannot, and the job changes.

Question 6What would you like to happen next?

In New York the company that assesses mold and the company that removes it cannot be the same company on one job, so it helps to know where you want to start.

The house, the damp, and how to reach you

Who should we ask for?

How can we reach you?

We call to confirm the details before anyone is sent out.

Where is the property?

The contractor match is by property, not by person, so the street line matters.

Anything else we should know?

Your $100 credit is attached to this request. Mention this offer when you book. See terms.

Your details are used only to respond to this request and arrange the service.

Planning

Opening up a prewar Manhasset house

Manhasset is a hamlet in the Town of North Hempstead, so permits for opening walls or replacing a floor go through the town, unless the house sits in one of the small incorporated villages around it, such as Munsey Park or Plandome, which keep their own. The median Manhasset home dates from 1942, older than almost any other place in the county, and a house that age has had eight decades for a roof valley, a flashing, a foundation crack or a buried pipe to start letting water in. With the water table more than sixty feet below the in-town well, a wet basement here is usually one of those and not the ground rising. Tell the assessor what has been renovated and when. In an older house, a finished wall put up over an old damp one hides where the water started, and the source has to be found before anything is rebuilt.

North Shore shingle colonial on a wooded hillside with a climbing driveway
Next Step

When was your Manhasset house last opened up?

Tell us the rough age of the house and any renovations you know about. In a Manhasset home that history usually points to where the water is getting in.

Start Your Quote Call (315) 640-3590
Availability

What we arrange for older Manhasset homes

Mold Inspection and Assessment

Find out whether the water behind the mold is coming up from the ground or out of the house itself, and get the scope in writing before anyone quotes for removal.

Mold Inspection in Manhasset →

Mold Remediation and Removal

Have the growth taken out by a licensed remediation firm working to the independent assessor's written plan, with the water that fed it repaired first.

Mold Remediation in Manhasset →

Water Damage Drying and Restoration

Get the water out and the structure dried before mold starts, including the slab, the flooring and the finished basement walls where water hides.

Water Damage Drying in Manhasset →
A booking service, not the contractorWe arrange the job and a separately licensed New York firm carries it out, sets its own price and signs its own agreement with you.
The firm that assesses never removesState law keeps the company that writes the mold plan apart from the company that carries it out, and bars one owner from holding a stake in both on your property.
Every trade licensed and insuredEvery firm we book holds the New York license its part of the work calls for, and you can look any mold license up on the state's own open register.
Local Detail

How old Manhasset's houses are, and how deep its water sits

Basement boiler with copper lines and a small drip stain from a slow leak

Census estimates for 2020 to 2024 count 2,871 housing units in Manhasset with a median year built of 1942, older than every Nassau place in this ledger except Sea Cliff and Floral Park, and 47.3 percent built in 1939 or earlier.

Source: US Census Bureau, American Community Survey 2020-2024 5-year estimates, Manhasset CDP, tables B25034, B25035, B25003, B25024 and B25040, accessed 2026-09-23

USGS well N 9897, inside Manhasset at a land elevation of about 96 feet, measured the water table 66.21 feet below the surface on April 18, 2016.

Source: U.S. Geological Survey, Water Data for the Nation, groundwater field measurements, accessed 2026-09-23

Next Step

Tell us what the Manhasset basement is doing

Every request is read by a person. Plenty of musty basements need a gutter or a dehumidifier rather than a crew, and if that is yours we will say so.

Start Your Quote Call (315) 640-3590
Start Your QuoteCall (315) 640-3590
Start Your Quote