Long Island's Certified Waterproofing Specialists ACM Basement Waterproofing is a family owned and operated waterproofing company that has been serving the people of Long Island for over twenty years. We have performed over 2,000 jobs across all of Nassau and Suffolk counties. Customer satisfaction is our number one priority, and as a smaller company we are able to give each customer a level of care and attention that many of our larger competitors cannot. We specialize in all methods of waterproofing and basement health, including French drains, pressure relief systems, sump pumps, home ventilation, and more. Give us a call today to take the first step on the road to a dry, healthy, and happy basement!