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Mold RemovalNassau County (315) 640-3590 Tap to call

Nassau County, New York

Wet spot in a Nassau house? Learn where the water started

Dark patches on a block wall, a musty slab floor or a cellar that stays damp? Tell us the town and the room. You will hear which job leads, what the water table has to do with it, and what to ask before anyone quotes.

Claim $100 off your first jobNothing to sign. Get the scope, then decide.(315) 640-3590 Tap to call

Your first booked job comes $100 off, paid by us.

White shingled Cape Cod house with two dormers and a dark front door, set back on a lawn between tall trees on a quiet street
Nassau CountyThree depth bands

We book your mold assessment first. A separate company does the removal. We are not the contractor.

Describe the wet spot

Start with a name, a mobile number and your ZIP. Add the room and the surface if you can.

Prefer to talk? Call (315) 640-3590

What Mold Removal Nassau County stands behind

  1. Reaching out is free, and you owe us nothing.
  2. We charge nothing for sorting out the job.
  3. Your assessor and your remediator work for different firms.

Read the full terms

Your first booked job comes $100 off, paid by us.

  • The $100 comes from us, so the contractor's quote is unchanged.
  • One per customer at each Nassau County address.
Claim it(315) 640-3590 Tap to call

Offer terms

  • Two firms, never oneAssessing and removing stay in separate hands.
  • Scope before priceRemoval quotes follow a written plan.
  • Nassau County onlyJobs from Port Washington to Massapequa.
  • Nothing to signAsk now. Decide after you read the scope.
The water table

Why a wet floor in Port Washington is not a wet floor in Syosset

Two wells about 1.3 miles apart on Manhasset Neck read 0.37 feet and 165.27 feet down. The gauge shows where your band sits.

People hear that Long Island has a high water table and reach for a sump pump. Across much of Nassau County that is the wrong guess. USGS says substructure flooding is more likely only where the water table is shallow.

Near the harbors and bays the ground can be a real suspect. Up on the North Shore hills and across the middle of the county the water sits tens of feet below your floor. A damp slab there usually has a nearer cause: a supply line, a heating line, a gutter, the grading or cold surfaces that sweat.

Tell us your town and where the damp shows. An assessor then reads your house, not a regional map with an error margin of 5 feet either way.

grounddeeper
  • North Shore hills and harbors

    USGS spring 2016 wells on Manhasset Neck differ sharply. Port Washington read 0.37 feet. Flower Hill read 165.27 feet, about 1.3 miles away.

    Roslyn read 10.26 feet and Glen Cove 104.57 feet. Higher land means deeper water. Up the slopes, check roofs, gutters, grading and pipes first.

  • The middle of the county

    Levittown and Garden City wells read about 24 to 26 feet. Hicksville read 47 feet. A Syosset well read 165 feet.

    The water sits far below a slab. Damp more often comes from the house. Think pipe, heating line, gutter or condensation.

  • The South Shore

    A USGS well in Elmont read about 36 feet down. Along the marshes and barrier island USGS had no data. Its map assumed sea level there.

    Readings are thin along the marshes. The ground stays a real suspect. An assessor checks the house first and names the cause.

Basis: USGS Scientific Investigations Map 3398, USGS National Water Information System

What you see

Start with what you can see

Find the log row that sounds most like your house, then open that page.

Most calls begin with a stain, a smell or a puddle. None of those tells you where the water came from, and that decides the job. The same black patch can be fed by a leaking pipe, by rain at the roofline or by the ground itself. Each one needs a different repair.

Describe yours in the form and say which room it is in. You will hear which service to start with before you commit to anything.

Note the room, the date and anything that changed this week, then call or send the form.

FAQ

Quick answers

Is a wet cellar on Long Island always groundwater?

No. In spring 2016, USGS wells read roughly 25 feet down at Garden City and Levittown. A Port Washington well read as shallow as 0.37 feet. When the water is far below your floor, look at pipes, gutters, grading and condensation first.

Why can I not get one company to assess and remove the mold?

Section 936 of New York's Labor Law says no licensee may do both jobs on one property. The firm that writes your scope should gain nothing from making the job bigger.

Do I need a mold test?

Often not. Sampling is rarely advised, the Department of Labor says, since some mold is always in the air and no standard exists to measure a result against. Ask an assessor whether a sample would change the plan for your house.

What if my mold patch is small?

EPA says a homeowner can often clean an area under about 10 square feet. Fix the water first, or the patch returns. If it keeps coming back, book an assessment.

How fast should I act after water gets in?

EPA advises drying wet material within 24 to 48 hours. Past that window, growth may start, and the job can turn into an assessment and a removal. Call as soon as you find the water.

Will you give me a price on this page?

No. Contractors set their own prices after they see the scope, and a price quoted blind would mislead you. The assessor's written plan is what lets you compare quotes.

How do I check that a contractor holds a New York license?

Request the license details, then check them on the register. The Department of Labor publishes its mold licenses as open data, so you can confirm the type and the name before you sign.

I rent my place. Who handles the mold?

Start with your landlord. Under Real Property Law section 235-b a New York landlord must keep a rented home habitable, so put the problem to your landlord in writing first. Send us the details and we can still explain the order of the work.

Not sure which job this is? Describe what you see.

Claim itOpen the request sheet
Concrete block basement wall framed with bare wood studs, white mineral staining on the lower blocks and drywall above
The jobs

Three jobs, and which one leads

New York licenses mold assessors and mold remediators separately, and one firm may not do both on the same project. Ask any contractor for its state license and look it up on the Department of Labor register.

Two firms

Why your assessor and your remediator are two firms

The assessor

  • Measures the growth and finds the wet material.
  • Names the water source where it can be traced.
  • Writes the plan that removal firms price.
  • Checks the finished work against that plan.

The remediator

  • Prices the assessor's plan, not a guess.
  • Seals off the area and takes out what cannot stay.
  • Cleans what can stay and leaves it for the check.
  • Never writes the plan or signs off the result.
  1. Written findings
  2. Written scope
  3. Written price
  4. Written clearance

Basis: New York Labor Law section 936 (Article 32), NYS Department of Labor

Where we work

Fourteen towns, North Shore to South Shore

Each town page covers the housing and water behind jobs in that place.

Start on the North Shore with Port Washington, Manhasset, Great Neck, Glen Cove, Sea Cliff and Roslyn. Across the middle, look at Syosset, Hicksville, Levittown, Garden City and Mineola. Down the South Shore, choose Hempstead, Elmont or Massapequa.

Live somewhere else in the county? Send the request anyway. The areas page shows how the three bands compare.

North Shore hills and harbors

The middle of the county

The South Shore

Not sure which job this is? Describe what you see.

Claim itOpen the request sheet
Laminate planks lifted off an underlay to show dark damp staining on a bare concrete slab
The houses

The 1950s houses behind many calls

Check what your floor is made of before you buy a fix.

The median Nassau home was built in 1955, and two in three went up before 1960. Some sit on concrete slabs or over small basements.

Levittown shows how this plays out. Levitt and Sons built 17,447 houses there between 1947 and 1951, on slabs with copper heating coils set in the concrete. A trade author writes that no vapor barrier went under them, so small leaks soaked into the ground unseen.

If your house is one of these, a damp corner or a lifting floor tile may trace to a line in the slab. Sealing the surface will not fix a leaking line. Ask the assessor to check the floor, the lines and the roof before any waterproofing quote. You can also read the slab house guide first.

Heating adds one more question. Census estimates show 26.5 percent of Nassau homes heat with fuel oil or kerosene, and 73.0 percent in Levittown. Tell your assessor where the tank, the boiler and any lines sit, because that shapes where the floor gets read.

Basis: USGS National Water Information System, USGS Scientific Investigations Map 3398

What moves a quote

What moves the price of your job

We do not set prices. Contractors quote the work, and these are the things that change what they quote.

The size of the affected area comes first. Next is what the growth sits on: painted block can often be cleaned, while carpet, pad and drywall are usually thrown out. A finished basement costs more to open up than a bare cellar wall.

The water source matters too. If a pipe or roof leak is still running, the repair comes before the cleanup, and that repair is a separate trade. Occupants in the house affect how the area is closed off and for how long.

You hold the lever on all of this. Ask for the assessor's written plan, send the same plan to two or three firms, and compare what each one prices. Then book the one you trust.

Timing matters as well. EPA wants wet material dry within a day or two, so call as soon as you find water.

What Mold Removal Nassau County stands behind

  1. Reaching out is free, and you owe us nothing.
  2. We charge nothing for sorting out the job.
  3. Your assessor and your remediator work for different firms.
  4. The $100 credit applies just as the Terms set out.

The work itself falls under your own contract with the contractor.

Mold Removal Nassau County, (315) 640-3590 Read the full terms

Your first booked job comes $100 off, paid by us.

  • The $100 comes from us, so the contractor's quote is unchanged.
  • One per customer at each Nassau County address.
  • Book the job by December 31, 2026 to use it.
  • The contractor quotes and bills the work.
Claim it(315) 640-3590 Tap to call

Offer terms

Low attic under a sloped roof with dark green-gray spotting on the sheathing and loose insulation along the floor beside a small window
Ask any contractor

Three questions to ask any mold contractor

  1. Which New York State mold license do you hold, and where can I look it up?Assessors and remediators hold separate licenses. Check yours on the Department of Labor register before you sign.
  2. Is this priced against a written plan from a different firm?A remediator cannot write the plan for the same job. A price with no plan behind it is a guess.
  3. Where did the water come from, and who is fixing it?The plan should name the source. Cleanup before the repair tends to grow back.

Basis: NYS Department of Labor, NY Open Data

Guides

Read before you decide

Trace the water early and the job stays smaller.

Claim itNothing to sign. Get the scope, then decide.(315) 640-3590 Tap to call