Union City, Tennessee: what the ground under the city is like
Union City sits in Obion County, on gulf coastal plain. The soil mapped here is predominantly classified well drained — and that classification, not the rainfall total, is what decides how a basement behaves.
34% of the mapped soil area around Union City is wet enough that the USDA describes it as needing artificial drainage.
Linear extensibility 4.8% — moderate.
Shallowest annual water table around 55 cm (1.8 ft).
Values are for Obion County, which is what the soil survey resolves to. Full county report · soil map for a specific address.
The ground under Union City
Gulf Coastal Plain. Unconsolidated sands and clays, pine uplands and broad flats
Extremely variable over short distances: deep sand on the ridges, saturated clay in the flats between them. High rainfall and a seasonally high water table make crawlspace and slab moisture the dominant complaint rather than structural movement.
When it shows up here
| Water | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ground movement | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
Water peaks from August to October with the tropical season, when a single storm can deliver a season’s rain in two days. The spring dry spell is when clay movement shows up.
Climate pattern for this physiographic region, not a forecast for your house and not from the soil survey. It answers a question homeowners actually ask: when does this show up.
What repairs cost in Tennessee
| Reference job | Modelled range |
|---|---|
| Interior drain along two walls + sump pump | $4,600–$9,850 |
| Exterior excavation of one 40 ft wall | $3,450–$9,850 |
| Underpinning on 10 piers | $13,650–$29,100 |
Regional factor for TN: ×0.91. Full cost breakdown for Tennessee · run your own dimensions.
ZIP codes in Union City
38261, 38281
Soil does not stop at a city boundary, and neither does this data — every ZIP code above resolves to the same county soil survey. For the individual survey polygons around one address, use the soil map.
Questions about Union City
Is the soil the same everywhere in Union City?
No. These values describe Obion County as a whole, which is the unit the soil survey publishes. Within a city, map units change over a few hundred metres — the soil map draws the actual polygons around a point and is the honest answer for one address.
Which contractor should I call in Union City?
We do not rank or recommend individual firms and we are not one. What this page is for is knowing which kind of work the ground here points to before anyone quotes you, and which claim to check. If you want quotes, the form below passes your request to the named networks.
Does this replace an inspection?
No. It tells you what the ground is; an inspection tells you what your building is doing on it. The useful order is: read this, print the brief for your county, then have someone look.
Get quotes in Union City
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