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Heterotrophic bacteria analysis of water samples at all locations before and after monochloramine treatment. Immediately after treatment refers to within 48 h after monochloramine startup. Site 12, municipal drinking water entering the hospital, did not have detections and is not shown. Dashed line represents 500 CFU/mL. Non-detect data points below 1 CFU/mL are not shown. Error bars represent standard deviations.
