Scientific Investigations Report 2006–5290
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290
Table 4. Summary of microbiological data collected from wells in major aquifer study, land-use study, and source-water quality assessment networks in 22 study units of the National Water-Quality Assessment Program, 1993–2004.
[Study network: MAS, major-aquifer study; LUS, land-use study; SWQA, source-water quality assessment. Abbreviations: CFU/100mL, colony-forming units per 100 milliliters. Symbols: <, less than; >, greater than; –, no value]
| Tests | Study network |
Number of wells |
Number of wells with detections (percentage) |
Concentration (CFU/100mL) |
||
|---|---|---|---|---|---|---|
| Median | Range | |||||
| Total coliform | MAS | 566 | 162 | (28.6) | <1 | <1 – 1,600 |
| LUS, all | 251 | 126 | (50.2) | 1 | <1 – 420 | |
| LUS, agriculture | 119 | 80 | (67.2) | 4 | <1 – >80 | |
| LUS, urban | 77 | 27 | (35.1) | <1 | <1 – 110 | |
| SWQA | 149 | 29 | (19.5) | <1 | <1 – >80 | |
| Escherichia coli | MAS | 592 | 51 | (8.6) | <1 | <1 – 1,200 |
| LUS, all | 237 | 50 | (21.1) | <1 | <1 – >80 | |
| LUS, agriculture | 112 | 34 | (30.4) | <1 | <1 – >80 | |
| LUS, urban | 70 | 12 | (17.1) | <1 | <1 – >80 | |
| SWQA | 149 | 3 | (2.0) | <1 | <1 – 2 | |
| Coliphage | MAS | 280 | 9 | (3.2) | – | – |
| LUS, all | 3 | 0 | (0) | – | – | |
| LUS, agriculture | 2 | 0 | (0) | – | – | |
| LUS, urban | 1 | 0 | (0) | – | – | |
| SWQA | 140 | 5 | (3.6) | – | – | |
1Includes Upper Snake River (USNK) wells sampled for fecal coliforms.
U.S.
Department of the Interior | U.S. Geological
Survey
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