Scientific Investigations Report 2006–5290
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290
Table 5. Summary of microbiological data collected from wells in each principal aquifer in 22 study units of the National Water-Quality Assessment Program, 1993–2004.
[Abbreviations: CFU/100mL, colony-forming units per 100 milliliters. Symbols: <, less than; >, greater than; –, no data or not applicable]
| Tests | Principal aquifer | Number of wells |
Number of wells with detections (percentage) |
Concentration (CFU/100mL) |
||
|---|---|---|---|---|---|---|
| Median | Range | |||||
| Total coliform | Valley and Ridge | 155 | 95 | (61.3) | 2 | <1 – 1,600 |
| Mississippian-Pennsylvanian | 57 | 22 | (38.6) | <1 | <1 – 420 | |
| Glacial Deposits | 170 | 38 | (22.4) | <1 | <1 – 110 | |
| Floridan | 58 | 32 | (55.2) | <1 | <1 – >80 | |
| Piedmont and Blue Ridge | 104 | 55 | (52.9) | <1 | <1 – >80 | |
| North Atlantic Coastal Plain | 50 | 19 | (38.0) | <1 | <1 – >80 | |
| Mississippi Embayment-Texas Coastal Uplands | 21 | 6 | (28.6) | <1 | <1 – 75 | |
| Central Valley | 28 | 11 | (39.3) | <1 | <1 – 63 | |
| Stream and River Valley | 96 | 12 | (12.5) | <1 | <1 – 60 | |
| Southeastern Coastal Plain | 25 | 3 | (12.0) | <1 | <1 – 25 | |
| Coastal Lowlands | 41 | 5 | (12.2) | <1 | <1 – 20 | |
| Columbia Plateau | 44 | 8 | (18.2) | <1 | <1 – 18 | |
| High Plains | 55 | 8 | (14.5) | <1 | <1 – 18 | |
| Basin and Range | 62 | 3 | (4.8) | <1 | <1 – 5 | |
| Ordovician (lower Tennessee) | 0 | – | – | – | ||
| Snake River | 0 | – | – | – | ||
| Escherichia coli | Valley and Ridge | 113 | 39 | (34.5) | <1 | <1 – 1,200 |
| Ordovician (lower Tennessee) | 30 | 9 | (30.0) | <1 | <1 – 440 | |
| Mississippian-Pennsylvanian | 121 | 18 | (14.9) | <1 | <1 – 340 | |
| Snake River | 82 | 1 | (1.2) | <1 | <1 – 90 | |
| Piedmont and Blue Ridge | 63 | 4 | (6.3) | <1 | <1 – 38 | |
| Southeastern Coastal Plain | 35 | 2 | (5.7) | <1 | <1 – 23 | |
| High Plains | 55 | 2 | (3.6) | <1 | <1 – 18 | |
| Mississippi Embayment-Texas Coastal Uplands | 21 | 3 | (14.3) | <1 | <1 – 15 | |
| Central Valley | 19 | 1 | (5.3) | <1 | <1 – 13 | |
| North Atlantic Coastal Plain | 50 | 6 | (12.0) | <1 | <1 – 8 | |
| Coastal Lowlands | 41 | 4 | (9.8) | <1 | <1 – 8 | |
| Glacial Deposits | 146 | 8 | (5.5) | <1 | <1 – 8 | |
| Floridan | 60 | 5 | (8.3) | <1 | <1 – 1 | |
| Basin and Range | 62 | 1 | (1.6) | <1 | <1 – 1 | |
| Stream and River Valley | 36 | 0 | (0) | <1 | – | |
| Columbia Plateau | 44 | 0 | (0) | <1 | – | |
U.S.
Department of the Interior | U.S. Geological
Survey
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