Table 1.
Concentrations of Escherichia coli (E. coli) expressed as the most probable number (MPN) in 100 ml of water sampled in the study sites (AG – Aas, Grytelandsbekken rural creek; SB – Ski, Blåveisbekken urban stream; BJ – Bergen, Jordalsvatnet drinking water reservoir; OM – Oslo, Maridalsvannet drinking water reservoir; and TJ – Trondheim, Jonsvannet drinking water reservoir). Number of samples with the dominant anthropogenic or zoogenic faecal contamination in water.
| Study sites |
E. coli counts min – max mean |
Dominant origin of faecal contamination in water samples | Total number of tested samples | |
|---|---|---|---|---|
| anthropogenic | zoogenic | |||
| AG |
1–144.5 9 |
1 | 9 | 10 |
| SB |
560–20 050 3 897 |
8 | 2 | 10 |
| BJ |
1–200.5 23 |
2 | 13 | 15 |
| OM |
2–200.5 38 |
0 | 10 | 10 |
| TJ |
2–200.5 58 |
2 | 13 | 15 |