Fargo, North Dakota: what the ground under the city is like
Fargo sits in Cass County, on red river valley (bed of glacial lake agassiz). The soil mapped here is predominantly classified poorly drained — and that classification, not the rainfall total, is what decides how a basement behaves.
83% of the mapped soil area around Fargo is wet enough that the USDA describes it as needing artificial drainage.
Linear extensibility 8.5% — high.
Shallowest annual water table around 55 cm (1.8 ft).
Values are for Cass County, which is what the soil survey resolves to. Full county report · soil map for a specific address.
The ground under Fargo
Red River Valley (bed of glacial Lake Agassiz). Fine lacustrine clay with a high smectite content
The combination that destroys foundations: no slope, impermeable clay, and extreme volume change. Foundation repair is a bigger trade here than waterproofing.
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 with the March–April thaw, when frozen ground stops absorbing and meltwater plus spring rain arrive together. If a basement here leaks once a year, that is when.
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 North Dakota
| Reference job | Modelled range |
|---|---|
| Interior drain along two walls + sump pump | $4,850–$10,400 |
| Exterior excavation of one 40 ft wall | $3,650–$10,350 |
| Underpinning on 10 piers | $14,400–$30,700 |
Regional factor for ND: ×0.96. Full cost breakdown for North Dakota · run your own dimensions.
ZIP codes in Fargo
58102, 58103, 58104, 58105, 58106, 58107, 58108, 58109, 58121, 58122, 58124, 58125, 58126
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 Fargo
Is the soil the same everywhere in Fargo?
No. These values describe Cass 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 Fargo?
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 Fargo
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