You can learn a remarkable amount about a parcel in an afternoon without paying anyone, if you are patient with government map viewers. This is the route, in the order we would take it, with an honest note on where each source stops being useful.
One habit first: write down the parcel number as soon as you find it, and use it everywhere. Rural addresses are unreliable, and two neighboring parcels can share one.
1. Find the parcel on the county map
Most counties publish a GIS parcel viewer, usually linked from the assessor’s or the county’s planning page. Search the address or owner, find the parcel, and note its number, acreage, and boundary. Many viewers also show zoning, floodplain, and aerial imagery as layers.
Where it stops: parcel lines are drawn for taxation. They can be off by a surprising distance, and they are not a survey.
2. Check the flood map
Go to the FEMA Flood Map Service Center, search the address, and open the dynamic map. Look for shading over the parcel and read its flood zone label. Zones starting with A or V are the high-risk floodplain; shaded X is moderate; unshaded X is minimal mapped risk.
Where it stops: the maps are a model at a point in time, and some areas have not been restudied in decades. They do not show drainage problems, and zone X land floods too. Ask the seller and the neighbors whether it ever has.
3. Look for wetlands and water
The U.S. Fish and Wildlife Service’s Wetlands Mapper shows mapped wetlands, ponds, and streams. Turn on the aerial imagery and compare. The USGS National Hydrography Dataset shows streams and rivers, including intermittent ones that may be dry when you visit.
Where it stops: wetland maps are drawn mostly from aerial photos at a coarse scale. They miss small or forested wetlands and keep some that have since dried out. A mapped wetland is a reason to look closer, not a legal boundary.
4. Read the soils
Web Soil Survey takes more clicks than the others and repays them. Define an area of interest around the parcel, open the Soil Map tab to see the map units, then use Soil Data Explorer to check suitability ratings. Two are worth finding:
Septic tank absorption fields
Rated not limited, somewhat limited, or very limited, with the reasons — slow drainage, a shallow water table, bedrock, steep slopes. “Very limited” is not a refusal, but it is a strong hint about how a site test may go.
Hydric rating
A map unit made up largely of hydric soils points to a wetland or a seasonally high water table, whatever the wetland map says.
Where it stops: soil survey map units are generalized, and a parcel can contain better or worse soil than its map unit suggests. Only a test pit tells you what is under your building site.
5. Check the road and the record
On the county map, see whether the parcel touches a road, then check whether that road is public. A county road list, the road department, or the plat will say. Next, pull the deed and any recorded plat from the county recorder or clerk. Many have online search. Look for easements, access agreements, and restrictions.
Where it stops: reading recorded documents yourself is a good first pass and a poor substitute for a title search. Unrecorded rights, boundary disputes, and gaps in the chain of title are what title companies are for.
6. Look at zoning and the assessor
The assessor’s record gives ownership, assessed value, tax status, and sales history; a big jump in taxes or an agricultural exemption that would be lost on sale is worth knowing about. The planning department’s zoning map gives the district, and the ordinance says what it allows.
7. Scan the surroundings
The EPA’s ECHO search shows regulated facilities and enforcement history nearby. The Fish and Wildlife Service’s IPaC tool lists listed species and critical habitat that may occur in an area.
What this costs you
Nothing but time — a few hours per parcel the first time, less once you know the tools. The harder part is putting the answers together: a soil rating, a wetland polygon, and a flood zone are three separate facts until you work out what they mean for the spot you want to build on. The next article covers what a complete land report should tell you, whoever writes it.