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Mifflin County, Pennsylvania

A shallow water table limits basements on 34% of Mifflin County's mapped land, a higher share than 52% of US counties. Shrink-swell clay limits houses without basements on 3%.

None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 11 flood losses here since 2016. 74% of homes were built before 1980, against 50% nationally; the median home dates from 1960.

Data as of October 13, 2026 · sources

3%

expansive clay: shrink-swell limits slab homes

34%

high water table: limits basements

0%

in drought, October 13, 2026

74%

of homes built before 1980

Soil under Mifflin County

Expansive clay (limits slab homes)3.2%
High water table (limits basements)33.5%
Septic fields very limited88.8%
Clay swell (LEP, by area)2.0%
High-swell land (LEP 6%+)1.5%
Mapped soil341,709 acres
Soil seriesShare hereSeries nationally: high water table
Hazleton20%0%
Laidig15%n/a
Berks8%under 1%
Dekalb6%n/a
Hagerstown5%n/a
Buchanan5%n/a
Juniata County: 33%Huntingdon County: 31%Centre County: 31%Perry County: 29%Snyder County: 28%Blair County: 42%Cumberland County: 23%Union County: 38%Mifflin County JuniataHuntingdonCentrePerrySnyderBlairCumberlandUnionMifflin
Mifflin 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 PA605 (2025-09-05)

What the numbers mean here

On 34% of Mifflin 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: 40.26 in, 2.52 in below the 1991-2020 average year of 42.78 in.

USDA rates 89% 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 16 of the last 52 weeks; the most was 100% of its area, in 4 weeks, most recently on the March 10, 2026 map.

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

Flood losses since 2016

11 flood losses since 2016, $68,189 paid. The worst year was 2021, with 9.

YearFlood losses
20160
20170
20181
20191
20200
20219
20220
20230
20240
20250
2026 to date0

Rain

Average year, 1991-202042.78 in
12 months to August 202640.26 in (-2.52)
202539.93 in (-2.85)
Wettest year since 18952018: 63.94 in
Driest year since 18951930: 25.55 in
Days with 1 inch or more, normal at LEWISTOWN (4 mi away)8.5

Homes

Housing units21,468
Median year built1960
Built before 198074%
Built 2000 or later11%
Owner-occupied71%
Median value, owner-occupied$156,700
Single-family detached70%

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
Juniata County, PA 14 mi 1% 33%
Huntingdon County, PA 21 mi 2% 31%
Centre County, PA 24 mi 4% 31%
Perry County, PA 25 mi under 1% 29%
Snyder County, PA 32 mi 1% 28%
Blair County, PA 35 mi 2% 42%
Cumberland County, PA 36 mi 1% 23%
Union County, PA 40 mi 1% 38%

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