Total Sites
32,297
9 federal databases
Severity Density
0.50
Severity-weighted sites per sq mi
High-Severity Sites
3,382
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in Arizona
Maricopa County carries Arizona's densest documented record — 1.87 severity-weighted sites per square mile across 11,547 records, most commonly Underground Storage Tanks, including 215 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Maricopa | 11,547 | 1.87 | Underground Storage Tanks |
| Santa Cruz | 708 | 1.39 | Mining |
| Pima | 5,043 | 0.98 | Nitrate |
| Pinal | 2,102 | 0.74 | Nitrate |
| Cochise | 1,810 | 0.60 | Nitrate |
| Yavapai | 2,396 | 0.60 | Mining |
| La Paz | 896 | 0.40 | Mining |
| Gila | 847 | 0.35 | Mining |
| Yuma | 1,047 | 0.33 | Nitrate |
| Mohave | 1,592 | 0.23 | Mining |
Maricopa
Sites
12K
Density
1.9
Source
Underground Storage TanksSanta Cruz
Sites
708
Density
1.4
Source
MiningPima
Sites
5K
Density
1.0
Source
NitratePinal
Sites
2K
Density
0.7
Source
NitrateCochise
Sites
2K
Density
0.6
Source
NitrateYavapai
Sites
2K
Density
0.6
Source
MiningLa Paz
Sites
896
Density
0.4
Source
MiningGila
Sites
847
Density
0.3
Source
MiningYuma
Sites
1K
Density
0.3
Source
NitrateMohave
Sites
2K
Density
0.2
Source
MiningAgricultural Pesticide Use in Arizona
In the 2019 federal survey estimates, Arizona's most-applied agricultural pesticides statewide were Glyphosate, Metolachlor-S and Metolachlor & Metolachlor-S. 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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