Total Sites
29,759
9 federal databases
Severity Density
0.47
Severity-weighted sites per sq mi
High-Severity Sites
4,349
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in Colorado
Denver County carries Colorado's densest documented record — 22.00 severity-weighted sites per square mile across 2,786 records, most commonly Underground Storage Tanks, including 31 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Denver | 2,786 | 22.00 | Underground Storage Tanks |
| Broomfield | 162 | 6.28 | Brownfields |
| Gilpin | 279 | 5.22 | Mining |
| San Juan | 558 | 4.17 | Mining |
| Clear Creek | 584 | 3.95 | Mining |
| Jefferson | 1,896 | 3.51 | Underground Storage Tanks |
| Arapahoe | 1,813 | 3.09 | Underground Storage Tanks |
| Boulder | 1,249 | 2.63 | Underground Storage Tanks |
| Adams | 1,943 | 2.26 | Underground Storage Tanks |
| Lake | 342 | 2.24 | Mining |
Denver
Sites
3K
Density
22.0
Source
Underground Storage TanksBroomfield
Sites
162
Density
6.3
Source
BrownfieldsGilpin
Sites
279
Density
5.2
Source
MiningSan Juan
Sites
558
Density
4.2
Source
MiningClear Creek
Sites
584
Density
3.9
Source
MiningJefferson
Sites
2K
Density
3.5
Source
Underground Storage TanksArapahoe
Sites
2K
Density
3.1
Source
Underground Storage TanksBoulder
Sites
1K
Density
2.6
Source
Underground Storage TanksAdams
Sites
2K
Density
2.3
Source
Underground Storage TanksLake
Sites
342
Density
2.2
Source
MiningAgricultural Pesticide Use in Colorado
In the 2019 federal survey estimates, Colorado's most-applied agricultural pesticides statewide were Glyphosate, 2,4-D and Atrazine. These estimates describe agricultural land use across the state — context for what's in use around the region, not a reading on any garden's soil.
Pesticide data: USGS NAWQA Pesticide National Synthesis Project (EPest county-level use estimates). Latest available county estimates: 2019.
County-Level Detail in Colorado
The federal record isn't uniform across a state. Here's what's documented around Colorado's counties with the densest records — each read from that county's own sites, not the state average. Proximity is information, not a diagnosis; a soil test settles any near neighbor.
Is It Safe to Grow Food in Denver County?
Federal record: HighWe checked the federal record around Denver County — 2,786 documented sites across 5 of the 9 source types we track, 31 of them high-severity.
The most significant on record: 31 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Denver County carries one of the heavier federal records we track — 2,786 documented sites, most of them underground storage tanks. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.
Documented sites nearest the Denver County center
- Ccod Stapleton Int'l Airport Main Boiler — Underground Storage Tanks · ~0.1 km from the county center
- Continental Airlines — Underground Storage Tanks · ~0.9 km from the county center
- Sam's Club #4777 — Underground Storage Tanks · ~0.9 km from the county center
These are the closest documented sites to Denver County's geographic center — a screening reference, not a reading on any specific address. Check your own Colorado parcel to see what's actually near you.
Is It Safe to Grow Food in Gilpin County?
Federal record: HighWe checked the federal record around Gilpin County — 279 documented sites across 5 of the 9 source types we track, 239 of them high-severity.
The most significant on record: 4 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Gilpin County carries one of the heavier federal records we track — 279 documented sites, most of them mining. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.
Documented sites nearest the Gilpin County center
- Stewart — Mining · ~0.3 km from the county center
- Petunia — Mining · ~0.6 km from the county center
- Pine Cone — Mining · ~0.7 km from the county center
These are the closest documented sites to Gilpin County's geographic center — a screening reference, not a reading on any specific address. Check your own Colorado parcel to see what's actually near you.
Check an Address in Colorado
Read your Colorado parcel
See exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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