A city’s or county’s municipal water supply is highly regulated by the EPA, and treatment is closely monitored to ensure that any and all additives remain within the guidelines. (Surprisingly, the water that comes through your pipes is more closely regulated than the kind that comes out of a bottle.) Chlorine is one of various chemicals used to treat water to make it safe, and different levels or combinations of these additives cause the water to tast differently. Water districts may change their water treatments depending on the pH levels of the water of the seasons. To answer this question would take some investigating, which would involve checking with individual water districts in target areas and comparing the data.
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