N.M. Code R. § 17.13.960.9
The Customer Service Rules and Regulations set forth in NMPSC Rule 960 [17.13.960 NMAC] establish the responsibilities and rights of jurisdictional sewer utilities and their residential customers in their sewer service relationship. Nothing herein shall prevent any utility from adopting Customer Service Rules and Regulations which do not conflict with but which are additional to those set forth herein to cover special circumstances. However, nothing in the preceding sentence shall be construed as relaxing the requirement that a utility choose only one of the Customer Rule 19 formats set forth herein. The election must be made. Any deviation from the selected customer rules and regulations must be requested from, and granted by the Commission.
N.M. Code R. § 17.13.960.9