See the plumes
This map shows where the sites are.
Run a report on your address to see plumes — wind direction, groundwater flow, and distance to each contact.
This is a screening estimate, not a soil test.
We show documented sites and modeled risk near this location from public federal records. We do not measure what is actually in your soil. A nearby documented site is a reason to test — not proof that your soil is contaminated. And a clean record is not a guarantee: public databases do not catalog every past land use, so the absence of a documented site is not evidence that soil is safe.
Before growing food, test your soil for lead and arsenic — it's inexpensive and it's the only thing that measures your ground. For a land purchase, a Phase I Environmental Site Assessment by a licensed professional is the standard. Do not rely on this screening for health, safety, legal, regulatory, or real-estate decisions.
Any decision you make from this screening — including what you grow, eat, or sell — is yours, and you take on the risk that comes with it. How we handle what we don't know →
Environmental Intelligence
Is My Land Contaminated?
9 types of contamination sources from federal databases can affect what's safe to grow on your property — Superfund, underground storage tanks, toxic releases, brownfields, PFAS, nitrate, livestock operations, mining sites, and pesticide residues. We check all 9 across 1.8 million sites, at distances that matter for garden soil safety.
Data: EPA FRS, CERCLIS, UST, TRI, UCMR 5, NPDES, USGS WQP, USGS MRDS, USGS NAWQA EPest, NOAA Climate Normals.
Check your specific parcel
Enter your address to see every EPA-registered contamination source near your property — with distance, facility status, wind direction analysis, and a risk assessment specific to your location.
9 contamination sources we analyze
National contamination landscape
Source: EPA FRS, CERCLIS, UST, TRI, UCMR 5, NPDES, USGS Water Quality Portal, USGS MRDS, USGS NAWQA EPest.
- Approximately 49 million Americans live within 3 miles of an active Superfund site, according to EPA environmental justice screening data.
- The EPA reports that petroleum leaks from USTs are among the most common sources of groundwater contamination in the United States.
- TRI facilities report releasing over 3 billion pounds of toxic chemicals annually, with air emissions being the largest category — which is why wind direction analysis matters.
Check contamination sources by state
Select your state to see EPA Superfund NPL site counts — then check your specific address for the full picture.
Browse Contamination Data by State
Each state page breaks down documented sites by source type and ranks its top counties.
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
- District of Columbia
How we analyze contamination risk for your parcel
Proximity query
We query the EPA Facility Registry Service for every registered facility within contamination-type-specific radii of your parcel centroid.
Facility status check
We check NPL status for Superfund sites, open/closed status for USTs, and release quantities from TRI reporting forms via EPA EnviroFacts.
Wind direction analysis (TRI)
For TRI facilities, we calculate prevailing wind direction from NOAA 30-year climate normals and classify your parcel as downwind, crosswind, or upwind.
Risk tier synthesis
Each source receives a 5-tier risk assessment (HIGH / ELEVATED / MODERATE / LOW / NONE). A master synthesis combines all sources into an overall contamination risk profile.
Check your specific parcel
Generic contamination maps show dots on a map. We show you what those dots mean for your specific parcel — distance, facility status, wind direction, and a risk tier that accounts for all nine contamination sources together.
Frequently Asked Questions
How do I know if my land is contaminated?
Enter your address to check 9 federal databases: Superfund, underground storage tanks, TRI facilities, brownfields, PFAS, nitrate monitoring, CAFO livestock operations, mining sites, and pesticide records — each at the distances that matter for your soil. Proximity alone doesn't mean your soil is contaminated, but knowing what's nearby is a responsible first step.
What are Superfund sites and why do they matter for gardening?
Superfund sites are locations where hazardous waste has been improperly managed or abandoned. Heavy metals like lead, arsenic, and cadmium can migrate through groundwater into surrounding soil, making nearby land potentially unsafe for growing edible plants.
Is it safe to garden near an underground storage tank?
It depends on the tank status and distance. Active leaking USTs release petroleum compounds (benzene, toluene) that contaminate soil and groundwater. Closed or remediated tanks are generally lower risk. We check every EPA-registered UST within 0.6 mi and report both status and distance.
What is the Toxic Release Inventory?
The EPA TRI tracks chemical releases from approximately 21,000+ industrial facilities nationwide. We pull release quantities from EPA EnviroFacts, then calculate prevailing wind direction from NOAA 30-year climate normals to classify your parcel as downwind, crosswind, or upwind.
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