Will My Land Pass for Septic?
Free pre-check for any lot in Texas: USDA soil rating, FEMA flood zone, and mapped wetlands — plus the septic system type you're likely looking at and its flat installed price.
Check the land before you buy it — or before you build
Whether a lot can take a septic system, and which kind, is decided by the soil under it. Most sellers can't tell you, and the answer moves the budget by thousands of dollars. This free tool reads the same public data a licensed site evaluator starts from — the USDA soil survey, FEMA's flood maps, and the federal wetlands inventory — and turns it into plain English: the likely system type, our flat installed price for it, and what your county will require.
- Buying rural land or acreage
- Placing a manufactured home on a lot
- Building on land you already own
Run the free land pre-check
What the pre-check looks at
USDA soil survey
The NRCS SSURGO database rates every mapped soil for septic absorption fields and names the reason — slow water movement, a shallow water table, flooding, or bedrock. We pull the rating, the dominant soil series, drainage class, and the annual minimum water table.
FEMA flood zone
The National Flood Hazard Layer tells us whether the point sits in a Special Flood Hazard Area, a regulatory floodway, or outside mapped hazard areas — the difference between a standard permit and floodplain design rules.
Wetlands inventory
The USFWS National Wetlands Inventory shows mapped wetlands on or within 300 m of the point. Wetlands drive setbacks and can bring the Army Corps into the permit.
Land pre-check questions
Is this a septic permit or a guarantee?
No. It's a pre-check built on public data. TCEQ requires a licensed site evaluator to dig two borings on the actual disposal area before any permit is issued (30 TAC §285.30). We include that evaluation in our flat price.
Why does almost every lot around Houston read "very limited"?
Gulf Coast clays and shallow water tables limit standard absorption fields almost everywhere in the region. "Very limited" doesn't mean you can't have septic. It means you'll need an aerobic treatment system with spray or drip dispersal, which is what most new homes here install.
What if the lot is in a flood zone?
You can usually still install a system. In a 100-year floodplain the tanks are sealed and anchored and the county floodplain administrator reviews the design. In a regulatory floodway, surface spray isn't allowed, so drip dispersal is the typical answer.
Can I check a lot I haven't bought yet?
Yes, and that is the best time. Run the address before you make an offer, then ask the seller whether an OSSF permit or site evaluation already exists for the tract.
How much does each system type cost?
Flat installed prices: conventional $9,000, aerobic with spray $13,500, aerobic with drip $15,500 — including the site evaluation, design, county permit, tank, and dispersal field.
Where does the data come from?
The USDA NRCS Soil Survey (SSURGO) through Soil Data Access, FEMA's National Flood Hazard Layer, and the USFWS National Wetlands Inventory — all public-domain federal datasets. Addresses are located with the U.S. Census Bureau geocoder and are not stored.
Want the real answer for your lot?
Our licensed site evaluation is included in every flat-price install. We dig the borings, handle the county permit, and give you a firm price before any work starts.