The water stain on the ceiling of a Flatbush co-op usually belongs to the apartment upstairs, the puddle in a Marine Park basement usually belongs to a slab or a service line, and the damp wall in a Ditmas Park Victorian usually belongs to a riser that has been dripping inside the plaster for months, and Brooklyn Plumber Co finds each one with acoustic and thermal leak detection before opening anything. Our licensed and insured plumbers repair in copper or PEX, replace the corroded valves that turn small leaks into floods, and coordinate with supers and boards on access.