Section R. 325.11903 - Change in classification of treatment system, distribution system, or public water supplyRule 1903. Any public water supply classified in accordance with R 325.11901 and R 325.11902 may be placed in a different classification by the department by reason of:
(a) Incorporation in the treatment system of special features of design.(b) Making operation different from usual.(c) Treating a particularly difficult type of raw water.(d) Upon a finding that the population served has changed.(e) The use of complex treatment systems.(f) The presence of a large service population.(g) When the distribution system is extensive or complex.(h) When a treatment system failure will not impact public health.Mich. Admin. Code R. 325.11903