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Warren County, New Jersey
A shallow water table limits basements on 22% of Warren County's mapped land. Shrink-swell clay limits houses without basements on 0%.
None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 68 flood losses here since 2016, 71% of them in buildings with basements. 60% of homes were built before 1980, against 50% nationally; the median home dates from 1972.
Data as of October 13, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, October 13, 2026
of homes built before 1980
Soil under Warren County
| Expansive clay (limits slab homes) | 0.0% |
| High water table (limits basements) | 21.6% |
| Septic fields very limited | 85.2% |
| Clay swell (LEP, by area) | 1.1% |
| High-swell land (LEP 6%+) | 0.0% |
| Urban land, not rated | 2.2% |
| Mapped soil | 231,700 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Washington | 11% | n/a |
| Annandale | 6% | n/a |
| Nassau | 5% | n/a |
| Parker | 5% | n/a |
| Hazen | 4% | n/a |
| Paulins Kill | 4% | n/a |
How we count · survey areas NJ041 (2025-08-28)
What the numbers mean here
On 22% of Warren County's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Rain over the 12 months to August 2026: 39.95 in, 8.83 in below the 1991-2020 average year of 48.78 in.
USDA rates 85% of the land very limited for septic absorption fields.
Drought
0% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 41 of the last 52 weeks; the most was 100% of its area, in 33 weeks, most recently on the June 23, 2026 map.
| Category, October 13, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 0% |
| D1 moderate drought or worse | 0% |
| D2 severe or worse | 0% |
| D3 extreme or worse | 0% |
| D4 exceptional | 0% |
Flood losses since 2016
68 flood losses since 2016, $799,345 paid. The worst year was 2023, with 34. Foundations of the buildings, where recorded: 71% basements, 10% slabs, 5% crawl spaces, 14% elevated. Median water depth outside the building: 15 in.
| Year | Flood losses |
|---|---|
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 0 |
| 2019 | 4 |
| 2020 | 8 |
| 2021 | 17 |
| 2022 | 1 |
| 2023 | 34 |
| 2024 | 3 |
| 2025 | 0 |
| 2026 to date | 1 |
Rain
| Average year, 1991-2020 | 48.78 in |
| 12 months to August 2026 | 39.95 in (-8.83) |
| 2025 | 36.55 in (-12.23) |
| Wettest year since 1895 | 2011: 73.50 in |
| Driest year since 1895 | 1965: 30.33 in |
| Days with 1 inch or more, normal at BELVIDERE BRG (4 mi away) | 12.1 |
Homes
| Housing units | 46,789 |
| Median year built | 1972 |
| Built before 1980 | 60% |
| Built 2000 or later | 15% |
| Owner-occupied | 75% |
| Median value, owner-occupied | $346,500 |
| Single-family detached | 68% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Northampton County, PA | 17 mi | 0% | 30% |
| Hunterdon County, NJ | 21 mi | 0% | 31% |
| Monroe County, PA | 22 mi | 0% | 60% |
| Morris County, NJ | 24 mi | 0% | 53% |
| Sussex County, NJ | 25 mi | 0% | 16% |
| Somerset County, NJ | 28 mi | 0% | 44% |
| Pike County, PA | 33 mi | 0% | 64% |
| Lehigh County, PA | 35 mi | 0% | 22% |
Sources: USDA SSURGO (August 28, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status