Total Sites
10,091
9 federal databases
Severity Density
1.59
Severity-weighted sites per sq mi
High-Severity Sites
152
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in New Hampshire
Hillsborough County carries New Hampshire's densest documented record — 3.26 severity-weighted sites per square mile across 2,148 records, most commonly Underground Storage Tanks, including 40 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Hillsborough | 2,148 | 3.26 | Underground Storage Tanks |
| Rockingham | 1,734 | 3.24 | Underground Storage Tanks |
| Strafford | 679 | 2.45 | Underground Storage Tanks |
| Belknap | 664 | 2.42 | Underground Storage Tanks |
| Merrimack | 1,448 | 2.33 | Underground Storage Tanks |
| Carroll | 737 | 1.25 | Nitrate |
| Cheshire | 590 | 1.13 | Underground Storage Tanks |
| Grafton | 1,131 | 0.98 | Underground Storage Tanks |
| Sullivan | 370 | 0.94 | Underground Storage Tanks |
| Coos | 590 | 0.52 | Underground Storage Tanks |
Hillsborough
Sites
2K
Density
3.3
Source
Underground Storage TanksRockingham
Sites
2K
Density
3.2
Source
Underground Storage TanksStrafford
Sites
679
Density
2.4
Source
Underground Storage TanksBelknap
Sites
664
Density
2.4
Source
Underground Storage TanksMerrimack
Sites
1K
Density
2.3
Source
Underground Storage TanksCarroll
Sites
737
Density
1.3
Source
NitrateCheshire
Sites
590
Density
1.1
Source
Underground Storage TanksGrafton
Sites
1K
Density
1.0
Source
Underground Storage TanksSullivan
Sites
370
Density
0.9
Source
Underground Storage TanksCoos
Sites
590
Density
0.5
Source
Underground Storage TanksAgricultural Pesticide Use in New Hampshire
In the 2019 federal survey estimates, New Hampshire's most-applied agricultural pesticides statewide were Glyphosate, Atrazine 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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