Scientific Investigations Report 2006–5290
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290
Table 8. Summary of coliphage data collected from major aquifer study and source-water quality assessment wells in each principal aquifer studied by the National Water-Quality Assessment program, 1993–2004.
[Abbreviations: –, no data or not applicable]
| Principal aquifer | Number of wells |
Number of wells with detections (percentage) |
|
|---|---|---|---|
| Floridan | 60 | 6 | (10.0) |
| Central Valley | 42 | 3 | (7.1) |
| Coastal Lowlands | 43 | 3 | (7.0) |
| Columbia Plateau | 36 | 2 | (5.6) |
| Piedmont and Blue Ridge | 12 | 0 | (0) |
| Basin and Range | 61 | 0 | (0) |
| Glacial Deposits | 66 | 0 | (0) |
| High Plains | 57 | 0 | (0) |
| Mississippi Embayment-Texas Coastal Uplands | 19 | 0 | (0) |
| North Atlantic Coastal Plain | 24 | 0 | (0) |
| Ordovician (lower Tennessee) | 0 | – | |
| Valley and Ridge | 0 | – | |
| Mississippian-Pennsylvanian | 0 | – | |
| Southeastern Coastal Plain | 0 | – | |
| Stream and River Valley Alluvial | 0 | – | |
| Snake River | 0 | – | |
U.S.
Department of the Interior | U.S. Geological
Survey
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