Scientific Investigations Report 2006–5290
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290
Table 7. Summary of microbiological data collected from major aquifer study and source-water-quality assessment wells used for domestic, public supply, and other purposes, and from unused wells by the National Water-Quality Assessment Program, 1993–2004.
[Abbreviations: CFU/100mL, colony-forming units per 100 milliliters; coliphage reported as present or absent only. Symbols: <, less than; >, greater than; –, no data or not applicable]
| Tests | Water use | Number of wells |
Number of detections (percentage) |
Concentration (CFU/100mL) |
||
|---|---|---|---|---|---|---|
| Median | Range | |||||
| Total coliform | Domestic | 405 | 134 | (33.1) | <1 | <1 – 1,600 |
| Public | 227 | 36 | (15.9) | <1 | <1 – >80 | |
| Commercial, industrial, institution, recreation | 27 | 9 | (33.3) | <1 | <1 – >80 | |
| Irrigation, stock | 12 | 3 | (25.0) | <1 | <1 – 25 | |
| Other | 7 | 1 | (14.3) | <1 | <1 – 1 | |
| Unused | 37 | 8 | (21.6) | <1 | <1 – 178 | |
| Escherichia coli | Domestic | 397 | 31 | (7.8) | <1 | <1 – 1,200 |
| Public | 220 | 6 | (2.7) | <1 | <1 – 14 | |
| Commercial, industrial, institution, recreation | 24 | 1 | (4.2) | <1 | <1 – 6 | |
| Irrigation, stock | 38 | 3 | (7.9) | <1 | <1 – 440 | |
| Other | 14 | 4 | (28.6) | <1 | <1 – 14 | |
| Unused | 48 | 9 | (18.8) | <1 | <1 – 68 | |
| Coliphage | Domestic | 200 | 7 | (3.5) | – | – |
| Public | 183 | 5 | (2.7) | – | – | |
| Commercial, industrial, institution, recreation | 6 | 1 | (16.7) | – | – | |
| Irrigation, stock | 2 | 0 | (0) | – | – | |
| Other | 4 | 0 | (0) | – | – | |
| Unused | 25 | 1 | (4.0) | – | – | |
U.S.
Department of the Interior | U.S. Geological
Survey
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