Posted on Google Linda WeissTrustindex verifies that the original source of the review is Google. 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!Posted on Google rose smithTrustindex verifies that the original source of the review is Google. 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.Posted on Google Craig TodaroTrustindex verifies that the original source of the review is Google. 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.Posted on Google Linda RussoTrustindex verifies that the original source of the review is Google. 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.Posted on Google Maria LacosteTrustindex verifies that the original source of the review is Google. 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.Posted on Google William RothsteinTrustindex verifies that the original source of the review is Google. 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.Posted on Google Links2282Trustindex verifies that the original source of the review is Google. 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.Posted on Google Peter WebbTrustindex verifies that the original source of the review is Google. 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
Basement Water Solutions
A wet basement can ruin your day and cause extensive damage to your belongings, furniture, and home. But, ACM basement waterproofing provides trusted and reliable basement waterproofing solutions for homeowners throughout Long Island.
We make it simple, affordable, and stress-free — with guaranteed results.
Long Island basement waterproofing isn’t about picking one product off a list. It’s about installing a complete system where each component handles a specific job:
During your free inspection, we’ll identify which components your basement needs and explain how they work together as a system.
The French drain is the most effective, efficient, and affordable solution for basement waterproofing. Interior perimeter French drains, also known as drain tiles, are now the preferred choice due to their durability and reduced risk of clogging. ACM specializes in installing advanced french drain systems.
A sump pump is a critical component of basement waterproofing, and ACM Basement Waterproofing is Long Island’s trusted expert for professional sump pump installation in basements and crawl spaces. The sump pump channels water via PVC piping to a designated outdoor discharge location. With decades of experience and award-winning service, ACM ensures reliable, high-quality sump pump solutions. Contact them today for a free quote.
A sump pump is essential for Long Island basement waterproofing, but it won’t function during a power outage, leaving your home vulnerable during heavy rains. ACM Basement Waterproofing recommends installing a battery backup sump pump to ensure continuous protection. This system collects water from the French drain and pumps it away from your home, even when the power is out.
Properly installed window well drain pipes can prevent water from leaking into your basement by redirecting it safely to the foundation drain or sump pump system. These solutions protect your Long Island home from water damage, mold, and rot, ensuring a dry, usable basement.
A basement vapor barrier is installed along the interior of your basement walls to prevent moisture from reaching the rest of your basement. ACM uses a dimple board vapor barrier, a rigid HDPE membrane that captures water seeping through your foundation and channels it down into your French drain. Available in white or grey to match your walls, the dimple board keeps your Long Island basement dry with a clean, finished look.
A basement vapor barrier is installed along the interior of your basement walls to prevent moisture from reaching the rest of your basement. ACM uses a dimple board vapor barrier, a rigid HDPE membrane that captures water seeping through your foundation and channels it down into your French drain. Available in white or grey to match your walls, the dimple board keeps your Long Island basement dry with a clean, finished look.
Expert yard grading and leveling services for your Long Island home address exterior factors that contribute to basement water issues. Poor yard grading can lead to water pooling near your foundation, causing leaks, erosion, and landscape damage. Proper landscape grading involves reshaping the land around your Long Island home to ensure a 5% slope away from the foundation, using clay-like soil for drainage and organic-rich topsoil for healthy plant growth.
An egress window in your Long Island basement is essential for meeting building codes and making your basement a safe, habitable space. Egress windows provide a secondary exit, required for living or sleeping areas, while offering natural light, ventilation, and peace of mind in emergencies.
Before your basement can be waterproofed, the water needs to be removed, and the basement needs to be dried so the waterproofing system can be installed. If you have existing basement water, we offer carpet fan rentals and basement dehumidifier rentals.
A musty basement may seem normal in Long Island, but it isn’t. Moisture leads to water damage, rot, and especially mold, which spreads through the air and can trigger allergies and asthma throughout your home. The only way to prevent these problems is by controlling moisture and improving air circulation to keep your basement, and your family, healthy.
A damp Long Island basement gives mold everything it needs to grow, and the worst of it often hides behind walls or inside insulation where you’d never spot it. Even mild exposure can bring on headaches or breathing problems over time, and the smell alone tells you something’s off. A simple air test shows what’s actually growing in your basement and how high the levels are, so you know exactly what you’re dealing with before it spreads.
For over 30 years, ACM has protected thousands of basements across Nassau and Suffolk counties. We’re a family-owned business, not a franchise, and we know how Long Island’s soil, water tables, and storms affect your foundation.
Local expertise. The sandy soil near Long Beach behaves nothing like the clay in Syosset. After 30 years, we know what each neighborhood demands.
Recognized and awarded. ACM is one of only three New York companies to receive the Basement Health Association’s Star Award, alongside multiple Best of Long Island and Angi Super Service awards.
Honest, no-pressure quotes. Free inspections with a real diagnosis. No high-pressure sales, no upsells you don’t need.
Serving All of Nassau and Suffolk Counties
CM provides basement waterproofing throughout Long Island, including all of Nassau County and Suffolk County. We serve Freeport, Garden City, Levittown, Wantagh, Syosset, Long Beach, Massapequa, Huntington, Smithtown, Babylon, Hicksville, Hempstead, Bay Shore, Patchogue, and surrounding communities
If you live in Long Island and are dealing with basement water, you need ACM, your local waterproofing contractor for permanent solutions. Call us today for a free estimate. Call us today to get a free estimate and permanent waterproofing solutions.
We make it simple, affordable, and stress-free — with guaranteed results.
*50% Off Materials Discount applicable to new projects over $10,000
Copyright © ACM Basement Waterproofing | All rights reserved.