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Washington County, Rhode Island
A shallow water table limits basements on 38% of Washington County's mapped land, a higher share than 57% of US counties and the 4th highest of 5 Rhode Island counties. 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 93 flood losses here since 2016, 39% of them in buildings with basements. 55% of homes were built before 1980, against 50% nationally; the median home dates from 1977.
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 Washington County
| Expansive clay (limits slab homes) | 0.0% |
| High water table (limits basements) | 38.2% |
| Septic fields very limited | 79.3% |
| Clay swell (LEP, by area) | 1.0% |
| High-swell land (LEP 6%+) | 2.4% |
| Urban land, not rated | 2.1% |
| Mapped soil | 242,160 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Canton | 10% | n/a |
| Charlton | 7% | n/a |
| Hinckley | 7% | n/a |
| Bridgehampton | 5% | n/a |
| Merrimac | 5% | n/a |
| Enfield | 3% | n/a |
How we count · survey areas RI600 (2025-09-03)
What the numbers mean here
On 38% of Washington 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: 43.14 in, 4.27 in below the 1991-2020 average year of 47.41 in.
USDA rates 79% 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 21 of the last 52 weeks; the most was 100% of its area, in 10 weeks, most recently on the July 21, 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
93 flood losses since 2016, $2.1 million paid. The worst year was 2024, with 39. Foundations of the buildings, where recorded: 39% basements, 10% slabs, 5% crawl spaces, 46% elevated. Median water depth outside the building: 10 in.
| Year | Flood losses |
|---|---|
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 5 |
| 2019 | 3 |
| 2020 | 2 |
| 2021 | 16 |
| 2022 | 10 |
| 2023 | 14 |
| 2024 | 39 |
| 2025 | 0 |
| 2026 to date | 2 |
Rain
| Average year, 1991-2020 | 47.41 in |
| 12 months to August 2026 | 43.14 in (-4.27) |
| 2025 | 41.46 in (-5.95) |
| Wettest year since 1895 | 1983: 61.26 in |
| Driest year since 1895 | 1965: 27.97 in |
| Days with 1 inch or more, normal at KINGSTON (8 mi away) | 14.6 |
Homes
| Housing units | 66,385 |
| Median year built | 1977 |
| Built before 1980 | 55% |
| Built 2000 or later | 18% |
| Owner-occupied | 78% |
| Median value, owner-occupied | $510,800 |
| Single-family detached | 77% |
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 |
|---|---|---|---|
| Newport County, RI | 19 mi | 0% | 66% |
| Kent County, RI | 19 mi | 0% | 34% |
| Southeastern Connecticut Planning Region, CT | 26 mi | 0% | 38% |
| Bristol County, RI | 28 mi | 0% | 38% |
| Providence County, RI | 33 mi | 0% | 42% |
| Northeastern Connecticut Planning Region, CT | 36 mi | 0% | 52% |
| Bristol County, MA | 37 mi | 0% | 63% |
| Lower Connecticut River Valley Planning Region, CT | 45 mi | under 1% | 38% |
Sources: USDA SSURGO (September 3, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status