Assessing a Property: Land, Water, and Soil

A homestead lives or dies by things a listing doesn’t show: how the soil drains, where the water table sits, whether the low corner is a wetland, whether the well is sound, and whether there’s room to put a barn and a septic field where the rules allow. Most of that can be checked from public maps before you ever make an offer, and the rest on a walk.

Soils

Start with the USDA Web Soil Survey, which covers more than 95% of U.S. counties ¹. Find the property by address, draw an Area of Interest around it, and you get a soil map with each soil type named, plus ratings for what each one is suited to ¹:

• Drainage class. Well drained, somewhat poorly drained, or poorly drained. Poorly drained soils mean wet basements, late spring planting, and trouble with septic systems ¹.
• Septic tank absorption fields. A “very limited” rating means a conventional drainfield may not work and you may be looking at a mound or holding tank.
• Dwellings with basements, farmland class, and garden suitability.

The survey is a screening tool; for a septic system, a certified soil tester digs pits and makes the official call ¹.

Water on the land

Wetlands are protected by law, and you need permits before building on them or filling them. Knowing they’re there before you buy saves legal trouble, flooded basements, and shifting foundations ². The DNR’s process ²:

1. Map review in the DNR’s Surface Water Data Viewer, which has the state wetland layers.
2. Walk the land looking for clues: standing water in spring, water-stained leaves, wetland plants like cattails, sedges, and willows, and dark, mucky soil.
3. Explore your options with the DNR before planning anything near them.

Floodplain maps are in the DNR’s permit viewer (the SW4P viewer) ². A new well can’t be built in a floodway ³, and you don’t want the barn there either.

The well and septic

Ask for the well construction report, which gives depth, casing, and the water level, and test the water for bacteria, nitrate, and, where relevant, arsenic before closing ⁴. (See the wells lesson for what to look for at the well head.) Find out where the septic tank and drainfield are, how old they are, and when they were last pumped and inspected.

Then check county and town zoning: what’s allowed on the parcel, how many animals, and what permits you’ll need for outbuildings.

Laying out around the well

Wisconsin’s well code, NR 812 Table A, sets minimum distances between a well and anything that could contaminate it. They’re measured edge to edge and can’t be waived because of a property line ³. The ones that matter most on a homestead:

Plan the rest of the layout around those circles: the barn and animal yard at least 50 feet off, and the manure pile at least 150, preferably downhill from the well, so surface water from them runs away from it, not toward it.

Slope, sun, and cold air

On the walk, also note:

• Aspect. A south- or southeast-facing slope warms earliest in spring, the place for the garden and orchard.
• Frost pockets. Cold air drains downhill and pools in low spots; valley bottoms can be several degrees colder than the slopes above, which matters for fruit blossoms and tender plants.
• Wind. In Wisconsin, winter winds come mostly from the northwest; a woodlot or windbreak on that side cuts heating and snow drifting.
• Access. Where the driveway will drift shut, and where a truck can reach the barn and woodpile.

Try it

Pick a property you know, or one for sale, and spend an hour with the Web Soil Survey and the DNR’s viewers: list its soil types and their septic ratings, mark any mapped wetlands and floodplain, and sketch where a well, septic field, barn, and manure pile could go and still meet the Table A distances.