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Our water system recently violated a drinking water standard. As required by the Iowa DNR, we continuously monitor disinfectant residual at the treatment plant at the source entry point to the distribution system. The standard is that the residual disinfectant concentration in the water entering the distribution system cannot be less than 0.3 mg/L free residual or 1.5 mg/L total residual for more than four hours. However, beginning February 25, 2024, the disinfectant residuals measured less than either of these concentrations until process modifications were made and adequate disinfectant residuals were restored on February 28, 2024. We also experienced a malfunction of the continuous monitoring instrument between February 18 and 25, 2024. Although this situation does not require that you take immediate action, as our customers, you have a right to know what happened, what you should do, and what we are doing to correct this situation.
