567—81.5 (455B) Water distribution system grades.
	   81.5(1) Classifications. The water distribution plant classifications are listed in the following table:
Water Distribution System Classifications*
 	Grade**	
System Type	Average Daily Pumpage in MGD	
	0-0.1	>0.1-1.5	>1.5-5	>5	
All municipal water systems	I	II	III	IV	
Community water systems not classified as a Grade A water system	I	II	III	IV	
Nontransient noncommunity water systems not classified as a Grade A water system	I	II	III	IV	
Rural water districts	Miles of Pipe	
	0-100	>100-
1,000	>1,000-
2,500	>2,500	
	II	II	III	IV	
*Note: A public water system with a well, storage, and a distribution system shall be classified as a water distribution system if no treatment is provided.
**For Grade A water system classification, see subrule 81.6(1).
	   81.5(2) Average daily pumpage. When the average daily pumpage is unknown, the system grade will be determined from the population of the most recent census and an evaluation of commercial, industrial, and other users.
	   81.5(3) IR certificate holders. Rescinded IAB 1/7/04, effective 2/11/04.