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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

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Basement Water Solutions

Best of Long Island Award for Basement Waterproofing in Long Island
Angi Super Service Award for Basement Waterproofing in Long Island

Our Long Island Service Area

Your Basement Waterproofing, Crawl Space Waterproofing & Foundation Repair Contractor Serving Nassau and Suffolk Counties

ACM Basement Waterproofing has served Long Island homeowners for years, covering every town from the Queens border out to Montauk Point and the North Fork. Our crews work daily across Nassau and Suffolk Counties, which means we know how foundations behave in coastal sand, North Shore clay, and everything in between. Wherever your home sits on Long Island, we can be there to inspect your basement, crawl space, or foundation.

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Serving All of Nassua & Suffolk County

Click on your town below to see reviews from our customers in your neighborhood! Or, check out our testimonials page for an assortment of handwritten reviews from customers from all across Long Island. 

Installed sump pump as part of basement waterproofing system in Long Island

Fixing Long Island Basements, Crawl Spaces and Foundations

Why Long Island Homes Need Specialized Waterproofing & Foundation Repair Experts

Long Island’s geography creates waterproofing challenges that generic contractors often miss. The high water table across much of Nassau and Suffolk, the freeze-thaw cycles each winter, the heavy clay soils inland, and the sandy conditions near the coast all affect how water moves around and through a foundation.

A waterproofing and foundation repair approach that works in Garden City may not be right for Montauk, and what works in Levittown may not suit a home in Lloyd Harbor. Our experience across every corner of Long Island lets us match the solution to the conditions on your property.

Basements, Crawl Spaces and Foundations

When it comes to basement waterproofing, crawl space solutions, and foundation repair, ACM is your trusted contractor serving Long Island. We have helped thousands of Long islanders keep their basements dry, their crawl spaces safe, and their foundations strong. Call us today to schedule a free inspection and quote.

 

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