Should a water utility elect to collect these expenses through an adjustment clause, the amount to be collected shall be collected from every customer on a pro rata basis as defined in NMPSC Rule 370.1 [17.12.370.9 NMAC]. The amount shall be added to the utility billings by a clean water testing surcharge and shall be so identified in a separate line item on the customer's bill.
N.M. Admin. Code § 17.12.370.10