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Estimated Levels of Enteric Organisms in Sewage and Polluted Surface Water in the United States
| Organism | Concentration (per 100 ml) |
|
|---|---|---|
| Raw sewage | Polluted stream water | |
| Coliforms | 109 | 105 |
| Enteric viruses | 102 | 1–10 |
| Giardia | 10–102 | 0.1–1 |
| Cryptosporidium | 1–10 | 0.1–102 |
From U.S. EPA (1988).
© 2009
