Population from U.S. Census ACS 5-year tract estimates aggregated to county · flood from FEMA NFHL · contamination from EPA Superfund and state brownfields · generated 2026-10-07.
What the numbers mean for a buyer
Population is up 19.6% since 2010 — steady growth rather than a boom. Ag-exemption rollback is the thing buyers most often miss in these counties: land that has carried an agricultural valuation for years can trigger several years of back taxes when the use changes.
TerraIQs carries 76,229 scored parcels across Harris County's 1,707 square miles — about 45 per square mile. That profile is a mix of subdivided tracts and working acreage — the county where both urban and rural constraints show up in the same search.
Flood risk in Harris County
Harris County has 4,353 mapped Special Flood Hazard Area polygons — extensive, well-studied flood mapping. At this density the question is rarely whether flood zones are nearby but which part of a given parcel sits in one: a parcel can be half Zone AE and half Zone X, which changes both the insurance requirement and where you can actually build.
See how to check whether a Texas parcel is in a flood zone for what each zone letter obligates you to do.
Contamination and environmental records
There are 251 recorded contamination sites in Harris County — a high count that reflects industrial history. Proximity is the thing to quantify: a report measures the distance from your parcel to each site, because a plume's relevance depends on distance, groundwater direction, and whether you intend to drill a water well.
Run a report on a Harris County parcel
Search by parcel ID, owner name or address. The report covers flood, pipelines, contamination, wells, soil, slope, zoning, infrastructure, protected areas, habitat and road access in one document. First report free.
What due diligence in Harris County involves
The county-level numbers above tell you what to expect; they don't settle any individual parcel. The checks that decide a deal — legal access, title exceptions, mineral severance, septic suitability, agricultural valuation rollback — are parcel-specific and partly document-based. Our Texas land due diligence checklist walks the full sequence in the order we'd run it, including which steps are free and which are worth paying for.
In Harris County specifically, note that pipeline crossings are common across Texas and are invisible from the road — pipeline easements restrict where you can build permanently.
Frequently asked
TerraIQs carries 76,229 scored parcels in Harris County. Statewide the dataset covers 14.3M+ parcels across all 254 counties; the scored subset is the rural-shard parcels, while urban and residential lots have full dossiers without a quality score.
Harris County has 4,353 mapped Special Flood Hazard Area polygons. Whether a specific parcel is affected depends on drainage rather than property lines, so it needs a parcel-level check — a single parcel can span both Zone AE and Zone X.
Flood zones, pipeline and utility proximity, contamination site distance, water well records, NRCS soil and septic suitability, slope and terrain, zoning where it exists, infrastructure, protected areas, critical habitat, road access with traffic counts, and population growth context — each with its source dataset version and retrieval date.