Fully verified Floodproofing / drainage Islip, NY · New Jersey & New York Coast
ACM Basement Waterproofing
A family-owned Long Island floodproofing installer with the strongest trust footprint on the drainage side, explicitly installing backwater valves and battery-backup sump systems (5.0 / 186 Google, A+ BBB, multiple Best of Long Island awards).
Credentials & verification
- BBB
- A+
- Insured / bonded
- Yes
- Years in business
- 30+ years
Services
Service area
Nassau County · Suffolk County · Long Beach · South Shore Long Island
Reviews (per platform, unblended)
Our verification notes
License number not captured, confirm the Nassau/Suffolk HIC number. Waterproofing/drainage focus; confirm engineered flood-vent scope if that is needed.
Sources checked
- BBB (A+ rating)
- Yelp
- Google Business Profile
Last verified 2026-07-13. This is an independent listing, not an endorsement, and we are not affiliated with ACM Basement Waterproofing. Confirm the current license, insurance and references directly before signing any contract.