Total Sites
22,453
9 federal databases
Severity Density
0.29
Severity-weighted sites per sq mi
High-Severity Sites
3,008
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in Montana
Jefferson County carries Montana's densest documented record — 1.41 severity-weighted sites per square mile across 923 records, most commonly Mining, including 553 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Jefferson | 923 | 1.41 | Mining |
| Silver Bow | 499 | 1.27 | Mining |
| Lewis and Clark | 1,459 | 0.83 | Nitrate |
| Broadwater | 410 | 0.76 | Mining |
| Yellowstone | 1,232 | 0.66 | Underground Storage Tanks |
| Gallatin | 1,041 | 0.65 | Nitrate |
| Granite | 445 | 0.63 | Mining |
| Ravalli | 783 | 0.62 | Nitrate |
| Missoula | 829 | 0.49 | Underground Storage Tanks |
| Powell | 523 | 0.48 | Nitrate |
Jefferson
Sites
923
Density
1.4
Source
MiningSilver Bow
Sites
499
Density
1.3
Source
MiningLewis and Clark
Sites
1K
Density
0.8
Source
NitrateBroadwater
Sites
410
Density
0.8
Source
MiningYellowstone
Sites
1K
Density
0.7
Source
Underground Storage TanksGallatin
Sites
1K
Density
0.7
Source
NitrateGranite
Sites
445
Density
0.6
Source
MiningRavalli
Sites
783
Density
0.6
Source
NitrateMissoula
Sites
829
Density
0.5
Source
Underground Storage TanksPowell
Sites
523
Density
0.5
Source
NitrateAgricultural Pesticide Use in Montana
In the 2019 federal survey estimates, Montana's most-applied agricultural pesticides statewide were Glyphosate, 2,4-D and Dicamba. 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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