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Long Island Chooses Us
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Linda Weiss profile picture
Linda Weiss
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We feel very fortunate to have found this company. I met with Mike regarding leaks in the basement. He assessed the entire house, gave me options and clearly explained the process. Everyone from Mike, to the secretary in the office to the workers were absolutely amazing. They did the work as promised, gave us a reasonable price, and left the place immaculate. We could not be happier with the results! This is a great family owned business. You can’t go wrong!
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rose smith profile picture
rose smith
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The work was done with the utmost professionalism and competence. The service representative was very thorough in examining the dehumidifier, air purifier and sump pump and provided any service needed including draining the pump.
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Craig Todaro profile picture
Craig Todaro
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Mark took it upon himself to come to my home and examine my issue himself. He is knowledgeable not only in basement waterproofing, but also in land grading, excavating and several other adjacent topics. While it was concluded my issue was not foundation oriented, he did not hesitate to propose several other creative ideas to help address my issue. He has a great disposition, and I would not hesitate to recommend his services to others.
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Linda Russo profile picture
Linda Russo
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I bought my house 24 years ago, and for 24 years I lived with water coming in to my finished basement. A few years back I hired another company to put in a French Drain System which never worked. As the storms got worse the water in my basement increased. Because of my previous experience I was hesitant to hire another company until I read about ACM and met Mark who was highly recommended by my Home Service Company. Mark spent about 2 hours explaining the process, and what was needed. In February 2025 ACM put a extensive French Drain System which included taking down the sheet rock walls, demoing tile and placing a membrane along the whole perimeter of the drain system. All of this work was completed in 3 days exactly what Mark said. The guys were professional, polite, and best of all they were careful to save my Radiant Heating System which was under the tile. Since the French Drain System was placed I have not had 1 drop of water coming into my basement. I am very grateful to Mark's ACM Company, and was able to refinish my basement without fear of water damage. I highly recommend ACM Basement Water Proofing to all who are having water problems with their basement.
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Maria Lacoste profile picture
Maria Lacoste
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ACM Basement Waterproofing did an excellent job in my basement, no more water intrusion. The job was handled professionally and on time. I am happy to recommend them.
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William Rothstein profile picture
William Rothstein
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I chose ACM because of their "Best of Long Island" award, and I'm glad I did. Mark's crew (led by Joe) installed an interior French drain and a sump pump in our basement. Six months later, we've had no problems with water. These guys know what they're doing.
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Links2282 profile picture
Links2282
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My wife and I would like to say thank you to Mark and his team for their excellent work installing a French Drain in our finished basement. For years we had to worry about flooding if we got a large amount of rain in a short time. The entire staff was totally professional. knowledgeable, competent and efficient. They were clean and caring and after each day they protected the whole worksite. Without a doubt, we would recommend them for all your basement waterproofing needs.
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Peter Webb profile picture
Peter Webb
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I called acm after finding water in the basement. Mark answered the call and quickly helped diagnose the issue. He guided me to check baseboard and sure enough a broken valve was causing this leak. It's good to find someone to help a homeowner without rushing to take their money. It's good to find a honest business man
Bethpage Best of Long Island Winner warded to ACM Basement waterproofing
Angi Super Service Award for ACM Basement Waterproofing in Long Island
Basement Health Association Star award given to ACM Basement Waterproofing in Long Island
Best of Long Island Award for Basement Waterproofing in Long Island
Angi Super Service Award for Basement Waterproofing in Long Island

Expert Basement Waterproofing & Foundation Contractor in Nassau County

Fixing Wet Basement and Damp Crawlspaces For Nassau County Homerowners

Living on Long Island presents unique challenges for homeowners. Our coastal location and variable climate create perfect conditions for water damage – but ACM Basement Waterproofing has protected Nassau County homes for decades with proven permanent solutions.

Protect Your Home Today

We make it simple, affordable, and stress-free — with guaranteed results.

Long Island basement sump pump experts near you

The Hidden Crisis of Basement & Crawl Space Moisture

Your home’s foundation faces constant pressure from Nassau County’s challenging environment. Between coastal storms, seasonal downpours, and dramatic temperature swings, water finds countless ways to infiltrate your basement and crawl space. What starts as a small seep or occasional puddle often signals deeper problems that can devastate your home’s structure and your family’s health.

The Problems That Come with Basement Water
When moisture invades your basement or crawl space, it sets off a chain reaction of problems unique to our coastal region. The same humid air that makes summer days feel sticky creates ideal conditions for toxic mold growth beneath your feet. As your foundation materials absorb water through our region’s diverse soils, freeze-thaw cycles accelerate damage, leading to bowing walls, spreading cracks, and unstable floors.

Common Types of Mold Issues in Nassau County
Black mold appears as dark patches on wet surfaces, releasing toxic spores that trigger respiratory issues. In poorly ventilated areas, Aspergillus and Penicillium develop as green, gray, or white spots that spread across walls and floors. These molds don’t stay contained – their spores travel through your home’s air circulation system, affecting every room. Professional waterproofing stops these molds at their source by eliminating the moisture they need to survive, protecting both your home’s structure and your family’s health.

Protecting Your Home in Nassau County

A wet basement isn’t just an inconvenience – it’s a liability. Water issues can slash your property value and endanger your health. Meanwhile, the constant battle against moisture forces your HVAC system into overdrive, driving up Long Island’s already substantial energy costs. Insurance companies know these risks well, often increasing premiums for unprotected Nassau County homes at risk of water damage. We’ve developed a comprehensive approach to basement and foundation protection, specifically engineered for Nassau County’s unique challenges:

Basement Waterproofing for Nassau County
Our certified basement waterproofing specialists in Nassau County don’t just patch leaks – we create permanent solutions. Using advanced interior French drains, reliable sump pumps, and expertly designed discharge systems, we transform wet basements into dry, protected spaces.

Foundation Repair Solutions in Nassau County
When water pressure causes walls to bow or crack, our carbon fiber strip reinforcement system provides lasting structural support with minimal disruption to your home. We stop damage in its tracks before it compromises your entire foundation.

Nassau County Crawl Space Waterproofing and Repair
Don’t let your crawl space become a breeding ground for mold and decay. Our complete waterproofing system for Nassau County homeowners, featuring interior drainage and modern sump pump technology, keeps this vital space dry and healthy.

Protect Your Home Today

We make it simple, affordable, and stress-free — with guaranteed results.

Trench drain at foot of basement entrance, basement waterproofing

Preparing for Your Nassau County Waterproofing & Repair Project

At ACM Basement Waterproofing, we make foundation repair as stress-free as possible. We don’t simply repair your basement; we work alongside you, offering expert advice and creative solutions that safeguard your home for the future. Your peace of mind is our top priority.

Nassau County Building Department
Phone: 516-571-2664
Mailing Address: Theodore Roosevelt Executive and Legislative Building 1550 Franklin Avenue Mineola, NY 11501-4898

Nassau County, NY Links:
Nassau County Website
Nassau County Building and Zoning Permit

Experienced Nassau County Contractors for Your Other Home Construction Needs

Here’s a list of contractors who could assist with your home projects in Nassau County. Please note that while we offer this information as a resource, ACM does not specifically endorse any of these contractors.

Plumber
Sal Manzo Plumbing, Heating & Cooling
1480 Wantagh Ave, Wantagh, NY 11793
516-347-7696

Electrician
BQ Electric
21 Holman Blvd, Hicksville, NY 11801
516-864-4600

Driveway Paving Contractor
J.I.P. Construction
33 Dayton St, Westbury, NY 11590
516-410-0312

Landscaper
Hicks Landscape Design
100 Jericho Turnpike Suite 102, Westbury, NY 11590
516-334-0068

Masonry
Genstar Masonry and Landscaping
5340A Merrick Rd, Massapequa, NY 11758
516-902-0869

Why Choose ACM Basement Waterproofing?

While other contractors come and go, ACM has spent decades building a reputation for excellence throughout Long Island. We bring:

  • Deep knowledge of Nassau County’s unique waterproofing challenges
  • Custom solutions designed for your specific situation
  • Certified specialists who understand local building requirements
  • A proven track record of successful projects across Long Island

Don’t wait for water damage to threaten your home’s foundation or your family’s health. Contact ACM Basement Waterproofing for expert guidance and lasting protection. Our team is ready to assess your needs and design a solution that will keep your home dry and secure for years to come.

Serving Nassau County homeowners with pride and expertise. Contact us today for your free inspection and estimate.

Protect Your Home Today

We make it simple, affordable, and stress-free — with guaranteed results.