Each Supplier on the priority list shall be assigned to one of the following priority classes:

Class A: Action is necessary to alleviate significant and documented public health hazards involving illness or to respond to a court-ordered compliance schedule.

Class B: Action is necessary to correct documented violations of primary drinking water standards established by the Department of Health Services.

Class C: Action is necessary to correct significant physical defects that affect a system's ability to meet primary standards.

Class D: Action is necessary to correct secondary drinking water standards violations.

Class E: Action is necessary to correct physical defects or waterworks deficiencies that do not result in violations of primary or secondary standards.