Flooding in Fair Lawn, New Jersey: the flood zone, the record, and what to do
Fair Lawn sits between two rivers. The Passaic runs along its western and southern edge, the Saddle along its eastern side, and several small brooks cross the borough between them. FEMA’s claim record shows which of them has mattered most.
The Bergen County 2026 Hazard Mitigation Plan maps 9.17 per cent of Fair Lawn in the FEMA 1 per cent annual chance flood zone, and 13.24 per cent including the 0.2 per cent zone. FEMA counts 360 National Flood Insurance Program claims for the borough, 32 repetitive-loss properties and eight severe ones. More than a third of the claims came from Hurricane Irene. Alongside the two rivers, FEMA maps Diamond, Henderson and Jordan brooks, and the county plan names Fair Lawn among towns prone to flash flooding.
The short version
- The Bergen County 2026 Hazard Mitigation Plan maps 9.17 per cent of Fair Lawn in the 1 per cent annual chance zone and 13.24 per cent including the 0.2 per cent zone.
- FEMA records 360 NFIP claims in the borough, 151 in 2011, and 32 repetitive-loss properties.
- The Passaic forms the western and southern boundary, the Saddle River runs along the east, and FEMA maps Diamond, Henderson and Jordan brooks between them.
- Irene crested at 14.19 feet at Little Falls, upstream of Fair Lawn, against a 9-foot major stage.
- The county plan lists Fair Lawn among towns prone to flash flooding from ageing or undersized stormwater systems.
How much of Fair Lawn is in the flood zone
The Bergen County 2026 Hazard Mitigation Plan (Table 4.6-1) counts about 306 of Fair Lawn’s 3,341 acres in the Special Flood Hazard Area, 9.17 per cent of the borough. Including the 0.2 per cent annual chance zone, the share is 13.24 per cent. That is less than in Rochelle Park or Saddle Brook, but Fair Lawn is a much bigger place: the US Census Bureau counts 35,610 residents and 12,500 housing units, with a median year built of 1953. Even a modest percentage covers a lot of homes, and the borough’s flood land is split between several separate corridors rather than one riverbank.
Two rivers and four brooks
The Passaic River forms Fair Lawn’s western and southern boundary, with Passaic County on the far bank. The USGS has measured the Passaic at Morlot Avenue in Fair Lawn, where it drains about 797 square miles, so its floods are slow and follow days of rain over north Jersey. The Saddle River runs along the eastern side; the USGS site at Fair Lawn puts its drainage at 45.2 square miles. Between them run small streams FEMA maps in its countywide flood study: Diamond Brook, which comes down from Ridgewood and Glen Rock and passes under an industrial complex before reaching the Passaic in Fair Lawn; Henderson Brook; and Jordan Brook, whose analysis was redone in 1987. The USGS has also monitored Lyncrest Brook at River Road. FEMA’s study notes one area of shallow flooding in the borough caused by inadequate containment at a culvert.
What the FEMA claim record shows
FEMA’s National Flood Insurance Program data, grouped by community, show 360 lifetime claims for the Borough of Fair Lawn. The year 2011 alone produced 151, and FEMA attributes 130 claims to Hurricane Irene. The other big years were 1999 with 58 (Hurricane Floyd, 57), 2007 with 50 (the April nor’easter, 48) and 2021 with 22 (Hurricane Ida, 21). FEMA’s Multiple Loss Properties data, as of 2 August 2026, list 32 repetitive-loss properties in the borough, eight of them severe repetitive loss. The county plan counts 139 active NFIP policies as of October 2024, roughly one for every 90 homes by our arithmetic. Irene matters so much here because it flooded both rivers at once.
Irene on the Passaic gauges
The National Weather Service has no forecast point inside Fair Lawn on the Passaic, but it has one on each side. Upstream at Little Falls, where major flood stage is 9 feet, Irene crested at 14.19 feet on 30 August 2011, two days after the storm passed and the highest there since 1903. Downstream at Clifton (Dundee Dam), where major stage is 7 feet, the same flood reached 5.9 feet, the highest crest there since 1977. Fair Lawn’s Passaic frontage lies between the two. On the Saddle River side, the Weather Service’s Lodi gauge, downstream of the borough, recorded 13.50 feet in Irene against a major stage of 8 feet. A storm that floods both rivers at once leaves the brooks between them with nowhere to drain.
Flash flooding and old drains
The county plan names Fair Lawn, with Hackensack, Ridgewood, Lodi, Little Ferry and Moonachie, among the Bergen towns that often experience flash flooding because of ageing or undersized stormwater systems and a high share of paved surface. That is a different problem from a river flood. It arrives within an hour of a cloudburst, can affect streets nowhere near a mapped zone, and tends to reach basements through window wells, stair doors and floor drains. In a borough where half the homes were built by 1953, the pipes carrying that water away, both public and private, are often old.
What this means if you own or rent here
Look up your address on the FEMA Flood Map Service Center; note which watercourse is nearest, because a Passaic flood, a Saddle River flood and a brook overflowing after a thunderstorm behave very differently. Near the Passaic, watch the Little Falls forecast, which leads the water arriving at Fair Lawn. Near the Saddle, watch Ridgewood and Lodi. Everywhere, keep gutters, downspouts and yard drains clear and consider whether a backwater valve suits your sewer line; a licensed plumber can advise. A standard homeowners policy excludes flood, and FEMA states that a new NFIP policy normally takes 30 days to take effect. About 22 per cent of homes are rented, per the US Census Bureau; tenants need their own contents cover. Whether a particular loss is covered is decided by your insurer and your policy wording.
Common questions
Does Fair Lawn, NJ flood?
Parts of it do. FEMA counts 360 flood insurance claims in the borough, more than a third of them from Hurricane Irene, and the county plan maps about 9 per cent of its land in the high-risk zone along the Passaic, the Saddle River and several brooks.
Which streams flood in Fair Lawn?
The Passaic River on the western and southern edge and the Saddle River on the east are the large ones. FEMA’s flood study also maps Diamond Brook, Henderson Brook and Jordan Brook within the borough.
Which gauge should Fair Lawn residents watch?
For the Passaic, the National Weather Service forecasts at Little Falls (major stage 9 feet) and Dundee Dam (major stage 7 feet), on either side of the borough. For the Saddle River, the Ridgewood and Lodi gauges.
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