Total Sites
15,895
9 federal databases
Severity Density
0.05
Severity-weighted sites per sq mi
High-Severity Sites
3,017
Superfund NPL, PFAS detections + similar top-tier records
Data Sources
EPA, USGS
9 databases checked
Source Breakdown
Top Counties in Alaska
Anchorage County carries Alaska's densest documented record — 5.14 severity-weighted sites per square mile across 4,972 records, most commonly Nitrate, including 71 high-severity sites. Density describes the county's record, not any single parcel.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Anchorage | 4,972 | 5.14 | Nitrate |
| Fairbanks North Star | 1,523 | 0.37 | Nitrate |
| Juneau | 402 | 0.27 | Mining |
| Prince of Wales-Hyder | 564 | 0.26 | Mining |
| Bristol Bay | 58 | 0.18 | Underground Storage Tanks |
| Chugach | 579 | 0.13 | Mining |
| Kenai Peninsula | 1,107 | 0.12 | Nitrate |
| Ketchikan Gateway | 281 | 0.12 | Mining |
| Sitka | 179 | 0.11 | Mining |
| Haines | 115 | 0.11 | Mining |
Anchorage
Sites
5K
Density
5.1
Source
NitrateFairbanks North Star
Sites
2K
Density
0.4
Source
NitrateJuneau
Sites
402
Density
0.3
Source
MiningPrince of Wales-Hyder
Sites
564
Density
0.3
Source
MiningBristol Bay
Sites
58
Density
0.2
Source
Underground Storage TanksChugach
Sites
579
Density
0.1
Source
MiningKenai Peninsula
Sites
1K
Density
0.1
Source
NitrateKetchikan Gateway
Sites
281
Density
0.1
Source
MiningSitka
Sites
179
Density
0.1
Source
MiningHaines
Sites
115
Density
0.1
Source
MiningCheck an Address in Alaska
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