On July 9, the National Weather Service issued flash flood warnings for Brooklyn and Staten Island and across Central New Jersey — Middlesex, Monmouth, Mercer, Somerset, and Hunterdon counties. If your basement, ground floor, or basement apartment took on water, here's the honest version of what to do next: dry everything within 24–48 hours, document it, and don't sign a big remediation contract while you're still wet and stressed. Many homes that dry out fast need no professional remediation at all.
A lot of the water in this storm ended up in below-grade units in Brooklyn, Queens-adjacent neighborhoods, and older Central Jersey housing. If you rent, two things at once are true: your landlord is generally responsible for the structure and habitability (which includes water intrusion and resulting mold), and your own belongings are generally your responsibility (renters insurance may help). Notify your landlord in writing today, keep the dated photos from step 4, and see our renters guide for what to say and what your rights look like in NY and NJ.
In this region, heavy rain often pushes water up through floor drains and low toilets — that's sewer backup, and it's handled differently from rainwater that came in a window well. Backup water is dirtier (porous items it soaked usually should go rather than be dried), and insurance treats it differently: many policies exclude backup unless you added a specific rider. If you're not sure which one you have, that's a good first question for the AI Mold Advisor.
Standing water you can't remove, sewage backup, a large soaked area, or water inside walls or ceilings. Acting fast is almost always cheaper than the mold that follows.
Water got in but you've removed it and drying is underway. Watch for musty smells or stains over the next week, and test only if a question remains.
A small amount of water, fully dried within a day, on hard non-porous surfaces. Keep it dry and ventilated — you very likely don't need to spend a dime.
After a widely reported flood, door-knockers and urgent phone pitches follow. Some are fine; some are not. The honest rule: no reputable company needs you to sign tonight. Get the water out first, take your photos, and compare at least two quotes for anything over a few hundred dollars. Our cost guide shows what mold and water-damage work typically costs, so you can spot a scare-quote when you see one.
It depends on how the water got in. Standard homeowners policies often exclude surface flooding (that's typically a separate flood policy, like NFIP), sewer backup often needs its own rider, and other sudden water events may be treated differently again. This is exactly why the dated photos in step 4 matter. Your insurer makes the coverage call, not us — call them early and ask directly.
Mold can begin growing on damp materials within about 24–48 hours. The priority right now is drying — get standing water out, run fans and a dehumidifier, and pull up soaked rugs and padding. Speed matters more than testing in the first two days.
In New York and New Jersey, landlords are generally responsible for keeping the unit habitable, which includes addressing water intrusion and resulting mold. Notify your landlord in writing right away, keep dated photos, and keep copies of everything. Your own belongings are typically your responsibility — renters insurance may help. More in our renters guide.
Often, no. If the water is out and everything is thoroughly dry within about 48 hours, many homes need no professional remediation at all. Where materials stayed wet longer — drywall, carpet padding, insulation — removing those materials may be needed. Get an honest read before you sign anything.
Get an honest read before you spend anything. The free AI Mold Advisor will tell you if this is a dry-it-yourself situation — most flood cleanups are.
✨ Ask the AI Mold Advisor — free