R 325.10304 Variance from MCL or treatment technique; required finding.

Rule 304. Variances from an MCL or treatment technique other than those prohibited in R 325.10303 may be granted by the director only upon his or her specific finding that either of the following conditions exists: (a) The supplier of water demonstrates that the characteristics of the raw water source or sources which are reasonably available to the public water supply do not permit the public water supply to meet the maximum contaminant level specified in a state drinking water standard despite application of the best available treatment technology, techniques, or other means which the department finds are generally available, taking costs into consideration, and that the granting of a variance will not result in an unreasonable risk to the health of persons served by the public water supply. (b) The supplier of water demonstrates that a specific treatment technique is not necessary to protect the health of persons served by the public water supply, and that the granting of the variance will not result in an unreasonable risk to the health of persons served by the public water supply.