Flooding in Alpine, New Jersey: no flood claims, and the water problems that remain
If you searched for flooding in Alpine, the short answer is that the record is empty. This page explains why, what the county's maps do show, and where water damage in an Alpine house is more likely to come from.
FEMA's National Flood Insurance Program has no flood claims on record for the Borough of Alpine and no repetitive-loss properties. The Bergen County 2026 Hazard Mitigation Plan maps 1.29 per cent of the borough in the 1 per cent annual chance flood zone, all of it Hudson River shoreline below the Palisades. The borough sits high on the ridge, and its own entry in the county plan says it faces no significant hazards. For Alpine homeowners, water damage comes from inside the house and from rain around it, not from a river.
The short version
- FEMA has no NFIP flood claims and no repetitive-loss properties on record for Alpine, even after Hurricane Ida.
- The Bergen County 2026 Hazard Mitigation Plan maps 1.29 per cent of Alpine in the flood zone, all of it Hudson shoreline.
- The Dwars Kill rises in Alpine and flows west to the Oradell Reservoir, carrying the borough's runoff downstream.
- The hazard the county plan does flag in Alpine is landslides and rockfall on the Palisades.
- Water damage in Alpine homes comes mainly from plumbing, sump failures and drainage around the foundation.
An empty record
FEMA's OpenFEMA claims data contain no NFIP flood claims for Alpine, and FEMA's Multiple Loss Properties data, as of 2 August 2026, show no repetitive-loss properties. That held even through Hurricane Ida in 2021, which produced claims in Tenafly, Cresskill, Demarest, Closter and Norwood next door. In FEMA's data only Alpine and Englewood Cliffs, of Bergen County's 70 municipalities, have no flood claims at all. The US Census Bureau counts 593 housing units and puts their median year built at 1982.
What the map shows
Table 4.6-1 of the Bergen County 2026 Hazard Mitigation Plan counts about 53 acres of Alpine, 1.29 per cent of its 4,096 acres of land, in FEMA's Special Flood Hazard Area, with no additional 0.2 per cent annual chance zone. The plan lists Alpine among the Hudson River communities where FEMA treats flooding as coastal, and the Palisades Interstate Park runs the length of the borough along the river. The mapped land is that shoreline strip at the foot of the cliffs, well below the borough's homes. FEMA's countywide Flood Insurance Study, revised in 2019, stated that Alpine had no Special Flood Hazard Areas on its effective date; the county plan is newer, and for a particular property the FEMA Flood Map Service Center shows which map is in force.
Where Alpine's streams begin
Alpine is a headwater town. The Dwars Kill begins here: USGS keeps a gauging point on it at Anderson Avenue, where the drainage area is just 0.35 square miles, and FEMA's study follows it west through Closter and Norwood to the Oradell Reservoir, by which point it drains 3.6 square miles. Rain that falls in Alpine runs off the ridge and becomes part of the flood picture downstream, in Closter especially.
The hazard that is mapped: the cliffs
The county plan does identify a natural hazard in Alpine, and it is the rock rather than the water. It classes about 12 per cent of the borough's land as susceptible to landslides and records a long history of rockslides on the Palisades, several of them triggered by heavy rain in the 1920s and 1930s, along with the talus slope known as the Giant Stairs. These affect the cliff face and the park below rather than the streets on top. The borough's own entry in the plan says it has no significant hazards and no mitigation projects planned for the next five years.
Where water damage really comes from
With no river or flood history, water damage in an Alpine house is almost always a building problem. In a large house, a failed supply line, water heater or appliance connection on a lower floor can run for a long time before anyone notices. A sump pump that stops during a power cut, a downspout discharging against the foundation, or groundwater after days of rain can wet a basement on high ground as easily as in a valley. None of this is flood in insurance terms, and FEMA notes that most homeowners policies do not cover flood in any case.
What this means if you own or rent here
Flood insurance is rarely a pressing question in Alpine, though a policy is available to any property in a participating community; the FEMA Flood Map Service Center will confirm your zone. The practical steps are about the house: know where the main water shut-off is, consider automatic leak detection on long supply runs, test the sump pump and its backup, and keep downspouts carrying water well away from the walls. Read your homeowners policy on pipe bursts, seepage and sewer backup, the losses an Alpine home is likelier to suffer. Whether a particular loss is covered is decided by your insurer and your policy wording.
Common questions
Does Alpine, NJ flood?
Not in FEMA's record: there are no flood insurance claims for Alpine at all. The only mapped flood zone is the Hudson River shoreline at the foot of the Palisades, far below the borough's homes.
Do I need flood insurance in Alpine?
A lender is unlikely to require it, since almost no homes are in a mapped zone. Check your address on the FEMA Flood Map Service Center. For most Alpine homes, the policy wording that matters more is how your homeowners insurance treats pipe bursts, seepage and sewer backup.
Why did my Alpine basement take water?
Almost certainly not from a river. The usual causes are a stopped sump pump, groundwater after long rain, runoff aimed at the foundation, or a plumbing failure. Working out which one it is decides who you call.
Find out who to call
Answer a few questions about what happened. You get the safety steps and the right trade whether or not you leave contact details.
Two referral lines cover this area. We have not vetted an individual company, and we will not route you to one whose coverage and registration we have not checked.
A pipe, water heater, sump pump or drain
Something inside the building failed and the water needs stopping.
Storm water, flooding or a soaked building
Water came in from outside, or the structure is wet and needs drying.
Not sure which you have? Answer a few questions and we will tell you. These are referral lines: they connect you to a company in the network, not to one this site operates or has inspected.
We are a free matching service, not a restoration contractor. Calls and requests are connected to independent providers.