HomeMississippiJefferson County

Jefferson County, Mississippi

A shallow water table limits basements on 34% of Jefferson County's mapped land, a higher share than 53% of US counties. Shrink-swell clay limits houses without basements on 11%.

100% of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 1 flood losses here since 2016. 39% of homes were built before 1980, against 50% nationally; the median home dates from 1986.

Data as of October 13, 2026 · sources

11%

expansive clay: shrink-swell limits slab homes

34%

high water table: limits basements

100%

in drought, October 13, 2026

39%

of homes built before 1980

Soil under Jefferson County

Expansive clay (limits slab homes)10.8%
High water table (limits basements)34.3%
Septic fields very limited84.0%
Clay swell (LEP, by area)3.6%
High-swell land (LEP 6%+)11.7%
Mapped soil337,700 acres
Soil seriesShare hereSeries nationally: high water table
Memphis32%0%
Natchez8%n/a
Smithdale8%0%
Loring8%99%
Lorman7%n/a
Lexington6%n/a
Claiborne County: 35%Franklin County: 45%Adams County: 27%Tensas Parish: 89%Copiah County: 63%Lincoln County: 69%Concordia Parish: 83%Amite County: 67%Jefferson County ClaiborneFranklinAdamsTensasCopiahLincolnConcordiaAmiteJefferson
Jefferson County (heavy outline) and nearby counties, shaded by high water table share.under 10%10-25%25-40%40-60%60%+

How we count · survey areas MS063 (2025-09-05)

What the numbers mean here

On 34% of Jefferson 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: 44.58 in, 14.06 in below the 1991-2020 average year of 58.64 in.

USDA rates 84% of the land very limited for septic absorption fields.

Drought

100% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 32 of the last 52 weeks; the most was 100% of its area, in 28 weeks, most recently on the October 13, 2026 map.

October 21, 2025Share of area in drought, weeklyOctober 13, 2026
Category, October 13, 2026Share of county
D0 abnormally dry or worse100%
D1 moderate drought or worse100%
D2 severe or worse30.8%
D3 extreme or worse0%
D4 exceptional0%

Flood losses since 2016

1 flood losses since 2016, $4,223 paid. The worst year was 2022, with 1.

YearFlood losses
20160
20170
20180
20190
20200
20210
20221
20230
20240
20250
2026 to date0

Rain

Average year, 1991-202058.64 in
12 months to August 202644.58 in (-14.06)
202553.08 in (-5.56)
Wettest year since 18951923: 78.70 in
Driest year since 18951924: 33.65 in
Days with 1 inch or more, normal at ST JOSEPH 3 N (19 mi away)18.9

Homes

Housing units3,390
Median year built1986
Built before 198039%
Built 2000 or later24%
Owner-occupied83%
Median value, owner-occupied$81,300
Single-family detached52%

What repairs cost

Published ranges from cost guides, not quotes. More sources, and where they disagree.

WorkRangeSource
Basement waterproofing, US $3,000 to $10,000 Fixr, February 6, 2026
Sump pump installation, US $800 to $2,000 Fixr, January 31, 2025
Crawl space encapsulation, US $2,000 to $8,000 Fixr, August 29, 2025

Nearby counties

PlaceDistanceExpansive clayHigh water table
Claiborne County, MS 18 mi 1% 35%
Franklin County, MS 20 mi 10% 45%
Adams County, MS 25 mi 9% 27%
Tensas Parish, LA 25 mi 75% 89%
Copiah County, MS 36 mi 14% 63%
Lincoln County, MS 37 mi 1% 69%
Concordia Parish, LA 39 mi 65% 83%
Amite County, MS 39 mi 2% 67%

Sources: USDA SSURGO (September 5, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status