Bacteriological Monitoring

What are AWW’s standards for safe and unsafe levels of E.coli in water?

What are AWW's standards for safe and unsafe levels of E.coli in water?

AWW uses the red-yellow-green traffic light symbol to summarize relatively safe and unsafe levels of E.coli in water. The value of 200 E.coli/100mL level defining safe versus unsafe water corresponds closely with the EPA’s and ADEM’s criteria of 235 E.coli/100mL Statistical Threshold Value (based on a single sampling event).