New Mexico backflow testing rules
New Mexico's drinking water rule (20.7.10.400(P) NMAC) prohibits cross-connections to a public water system unless the system is protected.
Who sets the rules in New Mexico
Protection must be an ASSE seal listed device or another device the Environment Department accepts (20.7.10.400(P) NMAC).
New Mexico defines a cross-connection as any unprotected actual or potential connection between a public water system and another source or system (20.7.10.7 NMAC).
The rule incorporates the ASSE seal authorization booklet by reference (20.7.10.102(B) NMAC).
The New Mexico Plumbing Code is the 2021 Uniform Plumbing Code as amended by the state (14.8.2.8 NMAC).
Lawn sprinkler contractors (MS-6 license) install and service potable water sprinkler systems, including their backflow devices (14.6.6 NMAC).
Sources: Cross-connections to a public water system are prohibited unless protected; The New Mexico Plumbing Code is the 2021 Uniform Plumbing Code as amended; Lawn sprinkler contractors (MS-6) work on potable water sprinkler systems including backflow devices
Which properties need a backflow preventer
Farm and ranch water lines tied to a potable source must be downstream of an approved backflow device (14.6.6 NMAC, MM-1).
Who may do the test
Where a backflow device is required on such lines, a certified journeyman employed by a licensed contractor permits and installs it (14.6.6 NMAC, MM-1).
Common questions
Is backflow testing required every year in New Mexico?
New Mexico's drinking water rule (20.7.10.400(P) NMAC) requires protection against cross-connections but does not set a statewide test interval; each water system sets its own testing schedule.