Cryptosporidium is not necessarily found in every surface water, and when the organism is known to occur in a particular supply, concentrations vary greatly. Cryptosporidium is eliminated by an effective treatment combination including sedimentation, filtration and disinfection. Cleveland Utilities periodically analyzes both raw and finished water from each of the water treatment plants it operates for Cryptosporidium. There were a total of 20 samples taken on raw and finished treatment plant waters in 1999. There were not any Cryptosporidium detected in the raw or finished water.
Value is the maximum quarterly average.
The level of a contaminant in drinking water below which there is no known or expected risk to health. The concentration of a contaminant which triggers a treatment or other requirement which a water system must follow. Action Levels are reported at the 90th percentile for homes at greatest risk. TON - Threshold Odor Number. A picocurie is 10-12 curies and is the quantity of radioactive material prodiucing 2.22 nuclear transformations per minute.