Section R. 325.10502 - Classification of public water suppliesRule 502.
(1) For purposes of implementing the act, public water supplies are classified by the department into 3 types as follows:(a) Type I: All community supplies are classified as type I public water supplies.(b) Type II: All noncommunity supplies are classified as type II public water supplies.(c) Type III: All water supplies which are not type I or type II public water supplies shall be classified as type III public water supplies.(2) Type II public water supplies are further classified by the department as follows: (a) Type IIa: Type IIa public water supplies are type II public water supplies with an average daily water production for the maximum month equal to or greater than 20,000 gallons per day.(b) Type IIb: Type IIb public water supplies are type II public water supplies with an average daily water production for the maximum month of less than 20,000 gallons per day.(3) When a public water supply is unable to determine average daily water production, the department may use other criteria based on similar public water supplies to make a determination of classification for purposes of subrule (2) of this rule.Mich. Admin. Code R. 325.10502