| Bacteria | |
|---|---|
| Maximum Contaminant Level (MCL) | Zero |
| Potential Health Effects (from ingestion of water) |
Gastrointestinal disorders |
| Potential Source of Contaminant | Naturally occurring, human or animal wastes |
| Applicable NSF/ANSI Standard(s) | Standard 55 Protocol P231 |
| Water Treatment Technologies Certified by NSF for Reduction of this Contaminant | Microbiological Purifiers Ultraviolet Disinfection |
| Special Notes | Standard 55 covers two types of ultraviolet disinfection systems:
Class A systems are designed to inactivate and/or remove microorganisms, including bacteria, viruses, Cryptosporidium cysts and Giardia cysts, from contaminated water. They are not designed to treat wastewater or water contaminated with raw sewage and should be installed in visually clear water. Class B systems are designed for supplemental bactericidal treatment of disinfected public drinking water or other drinking water that has been tested and deemed acceptable for human consumption. These systems are designed to reduce normally occurring, nonpathogenic or nuisance microorganisms only. Class B systems are not intended for the disinfection of microbiologically unsafe water. |
