N.M. Code R. § 20.7.3.801
A. A privy may be used to dispose of non-liquid-carried human excreta directly to the soil. A vault may be used to dispose of non-liquid-carried human excreta for subsequent pumping and disposal in accordance with 20.7.3.306 NMAC. In addition to all setback and clearance requirements in 20.7.3 NMAC, the following conditions are required.
(1) The privy or vault is constructed to prevent access by flies or vermin.
(2) The privy or vault is located to prevent flooding.
(3) There are sufficient replacement locations for two additional privy pits. Vaults do not require replacement locations.
(4) Privy pits shall be filled with clean earth when excreta accumulate to within one foot of the ground surface.
[20.7.3.801 NMAC - Rp, 20.7.3.802 NMAC, 9/1/13; A, 9/1/13]