Hamilton, New Jersey Flood Zones
Last updated: March 2026
Hamilton faces flooding from Assunpink Creek and the broader Delaware River watershed in Mercer County. Heavy rainfall events cause creek overflows that flood low-lying residential and commercial areas.
Mercer County has recorded 2,430 NFIP flood insurance claims since 1978, totaling $48.4M in payouts. Explore the full NFIP claims data by state and county to see how this area compares nationally.
FEMA Region
Region 2
NFIP Policies
1,768
Mercer County
Avg. Premium
$1,669/yr
Mercer County
FEMA Flood Risk Profile: Mercer County
Based on FEMA's National Risk Index, which evaluates flood risk at the county level using historical loss data, exposure, and vulnerability.
Inland Flood Risk
Relatively HighEst. annual loss: $113.6M
Coastal Flood Risk
Relatively LowEst. annual loss: $329K
Hurricane Risk
Relatively HighEst. annual loss: $18.1M
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: Mercer County
Mercer County has been included in 11 federal flood-related disaster declarations.
...and 3 earlier declarations since 1971.
These declarations affected communities across Mercer County, including Hamilton.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: Mercer County
Properties in Mercer County have filed 2,430 NFIP flood insurance claims totaling $48.4M in payouts since 1978. The average claim payout is $20K.
Highest-Claim Years
2011
408 claims - $15.1M
2006
243 claims - $2.7M
1996
237 claims - $4.2M
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced March 2026. See national claims data.
What Your Flood Zone Means in Hamilton
Hamilton faces multiple inland flood threats, including riverine flooding from nearby waterways and flash flooding from intense rainfall overwhelming urban drainage systems. Properties near river corridors face the highest risk, but stormwater backup can affect neighborhoods well outside the mapped floodplain. The most common FEMA flood zone designations in Hamilton are Zone AE, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $113.6M.
With both riverine and urban stormwater flood risk, insurance costs in Hamilton depend heavily on a property's elevation relative to nearby waterways and the local drainage infrastructure. FEMA's Risk Rating 2.0 prices in multiple inland flood sources rather than relying on the flood zone line alone. If your property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance.
Flood zone boundaries in Hamilton can shift when FEMA updates its Flood Insurance Studies or when upstream development changes how water moves through the watershed. New stormwater infrastructure or dam modifications can also trigger map revisions. Use our free lookup tool to check the current flood zone for any Hamilton address.
Flood Insurance Discount: Hamilton
Hamilton participates in FEMA's Community Rating System (CRS), a voluntary program that rewards communities for flood mitigation efforts beyond minimum NFIP requirements. Residents in the Special Flood Hazard Area may qualify for reduced flood insurance premiums.
CRS Class
Class 7
SFHA Premium Discount
15% off
CRS classes range from 1 (best) to 10 (no discount). Hamilton's Class 7 rating means NFIP policyholders in the SFHA can receive up to a 15% discount on their flood insurance premiums. Properties outside the SFHA may receive a 5% discount.
Source: FEMA Community Rating System, October 2025. Discounts apply to NFIP policies only.
Hamilton, NJ Flood Zone FAQ
What flood zones are in Hamilton, NJ?
The most common FEMA flood zones in Hamilton are Zone AE, Zone X. Properties in these high-risk zones (SFHA) may require flood insurance with a federally regulated or government-backed mortgage.
Is flood insurance required in Hamilton?
If your Hamilton property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance. Properties in Zone X are not federally required to carry flood insurance, though coverage is still recommended since over 40% of all NFIP flood claims come from Zone X properties.
How do I check my flood zone in Hamilton?
Enter your Hamilton address in the search tool above for an instant flood zone determination. Results include your FEMA flood zone, SFHA status, base flood elevation (if available), and FIRM panel information, pulled directly from FEMA's National Flood Hazard Layer.
Does Hamilton offer flood insurance discounts?
Yes. Hamilton participates in FEMA's Community Rating System (CRS) with a Class 7 rating, qualifying residents in the Special Flood Hazard Area for up to a 15% discount on NFIP flood insurance premiums. Properties outside the SFHA may receive a 5% discount.
Has Hamilton experienced major flooding events?
Mercer County, where Hamilton is located, has been part of 11 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Remnants of Hurricane Ida in 2021. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Hamilton?
Mercer County has recorded 2,430 NFIP flood insurance claims totaling $48.4M in payouts since 1978. The year with the most claims was 2011, with 408 claims and $15.1M in payouts. These figures cover all NFIP claims in the county, including Hamilton.
How many flood insurance policies are active in Hamilton?
Mercer County currently has 1,768 active NFIP flood insurance policies with an average annual premium of $1,669. The most policies are in Zone AE (1,029 policies). These figures cover all active NFIP policies in the county.
Can my Hamilton property be removed from a high-risk flood zone?
Yes, if your property's natural ground elevation is above the Base Flood Elevation and FEMA inadvertently mapped it in a high-risk zone, you can apply for a Letter of Map Amendment (LOMA). A successful LOMA removes the property from the Special Flood Hazard Area, generally eliminating the federal mandatory flood insurance requirement. You will need an elevation certificate from a licensed surveyor. If a property was raised above the BFE with fill material, the process is a LOMR-F rather than a LOMA.
What is Base Flood Elevation in Hamilton?
Base Flood Elevation (BFE) is the predicted height of floodwaters during a 1% annual chance (100-year) flood, shown on FEMA maps as an elevation number in feet above sea level. In Hamilton's Zone AE areas, BFE lines appear on the FIRM as wavy contours labeled with elevation values. Properties with a lowest floor at or above the BFE typically qualify for significantly lower NFIP flood insurance premiums.
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Look Up Any Hamilton, NJ Address
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Disclaimer: Flood risk data on this page is sourced from FEMA datasets including the National Risk Index, NFIP claims and policy records, disaster declarations, and the Community Rating System. These datasets were last extracted on March 2026 and may not reflect the most recent changes. This page is for informational purposes only and is not a certified flood zone determination. Always verify current flood zone status through FEMA or a licensed determination provider before making property, insurance, or lending decisions.