Total Sites
21,100
9 federal databases
Severity Density
0.48
Severity-weighted sites per sq mi
High-Severity Sites
3,048
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in Idaho
Canyon County carries Idaho's densest documented record — 5.07 severity-weighted sites per square mile across 1,694 records, most commonly Nitrate, including 7 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Canyon | 1,694 | 5.07 | Nitrate |
| Ada | 2,791 | 4.47 | Nitrate |
| Shoshone | 1,298 | 1.19 | Mining |
| Minidoka | 483 | 1.14 | Nitrate |
| Jerome | 381 | 1.10 | Nitrate |
| Kootenai | 701 | 0.89 | Underground Storage Tanks |
| Twin Falls | 1,036 | 0.89 | Nitrate |
| Blaine | 911 | 0.86 | Mining |
| Madison | 250 | 0.85 | Nitrate |
| Gem | 238 | 0.81 | Nitrate |
Canyon
Sites
2K
Density
5.1
Source
NitrateAda
Sites
3K
Density
4.5
Source
NitrateShoshone
Sites
1K
Density
1.2
Source
MiningMinidoka
Sites
483
Density
1.1
Source
NitrateJerome
Sites
381
Density
1.1
Source
NitrateKootenai
Sites
701
Density
0.9
Source
Underground Storage TanksTwin Falls
Sites
1K
Density
0.9
Source
NitrateBlaine
Sites
911
Density
0.9
Source
MiningMadison
Sites
250
Density
0.8
Source
NitrateGem
Sites
238
Density
0.8
Source
NitrateAgricultural Pesticide Use in Idaho
In the 2019 federal survey estimates, Idaho's most-applied agricultural pesticides statewide were Glyphosate, 2,4-D and Bromoxynil. 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.
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