Recent history of microbes in town wells

New regulations about water system reporting came into effect on December 1. These new regulations require water system operators to publicly announce microbial contaminates when they occur in the source water, even if it is prior to treatment. There have been instances in the past where wells have seen positive results for microbes but the regulations at the time did not require a public announcement. There has not been an instance where microbes were detected in the distribution system following treatment.
The linked document shows the 3 year history of microbe detection (MS Word format) and the affected wells. Many of these events occur after heavy rainfall ...

... and the water department takes steps during such times to shut down those wells that they know are more susceptible to contamination.
Given the past history and the new reporting rules, it is likely that we will see more of this type of reporting in the future. I want to emphasize that the detection was prior to treatment and no microbes have been detected in the distribution systems.