Total Sites
28,062
9 federal databases
Severity Density
0.73
Severity-weighted sites per sq mi
High-Severity Sites
314
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in Iowa
Polk County carries Iowa's densest documented record — 4.36 severity-weighted sites per square mile across 1,963 records, most commonly Underground Storage Tanks, including 27 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Polk | 1,963 | 4.36 | Underground Storage Tanks |
| Linn | 1,560 | 3.26 | Underground Storage Tanks |
| Scott | 804 | 2.19 | Underground Storage Tanks |
| Muscatine | 555 | 2.05 | Nitrate |
| Black Hawk | 860 | 2.04 | Underground Storage Tanks |
| Johnson | 681 | 1.65 | Underground Storage Tanks |
| Dubuque | 659 | 1.51 | Underground Storage Tanks |
| Des Moines | 417 | 1.49 | Underground Storage Tanks |
| Cerro Gordo | 553 | 1.34 | Underground Storage Tanks |
| Story | 541 | 1.25 | Underground Storage Tanks |
Polk
Sites
2K
Density
4.4
Source
Underground Storage TanksLinn
Sites
2K
Density
3.3
Source
Underground Storage TanksScott
Sites
804
Density
2.2
Source
Underground Storage TanksMuscatine
Sites
555
Density
2.1
Source
NitrateBlack Hawk
Sites
860
Density
2.0
Source
Underground Storage TanksJohnson
Sites
681
Density
1.6
Source
Underground Storage TanksDubuque
Sites
659
Density
1.5
Source
Underground Storage TanksDes Moines
Sites
417
Density
1.5
Source
Underground Storage TanksCerro Gordo
Sites
553
Density
1.3
Source
Underground Storage TanksStory
Sites
541
Density
1.2
Source
Underground Storage TanksAgricultural Pesticide Use in Iowa
In the 2019 federal survey estimates, Iowa's most-applied agricultural pesticides statewide were Glyphosate, Acetochlor 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.
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