Albuquerque straddles the Rio Grande in the middle of New Mexico's high desert, and while the city proper is served by Albuquerque Water Utilities' municipal sewer system, the surrounding Bernalillo County — including the East Mountains communities of Tijeras, Edgewood, Cedar Crest, and Tijeras — depend entirely on onsite septic systems. The West Mesa communities west of the Rio Grande also have significant septic populations. New Mexico's arid climate means that evapotranspiration plays a much larger role in system function than in wetter states, and the NMED's Liquid Waste Regulations are calibrated accordingly. Caliche hardpan is the primary site constraint for septic installation throughout the metro area.
Soil Conditions
Albuquerque loamy sand and Bluepoint gravelly loamy sand on Rio Grande bosque terraces — Typic Torrifluvents with excellent percolation; Wyo cobbly sandy loam on mesa surfaces; Penistaja fine sandy loam on the West Mesa with caliche restrictive layers common at 18 to 36 inches
Albuquerque loamy sand and Bluepoint gravelly loamy sand near the Rio Grande are Typic Torrifluvents with percolation rates of 3 to 10 minutes per inch — excellent drainage but rapid movement means treatment must be factored carefully. Penistaja fine sandy loam on the West Mesa is a Typic Haplargid with a caliche restrictive layer commonly found at 18 to 30 inches. Caliche must be identified in soil profile descriptions and engineered around via ETA (evapotranspiration-absorption) beds or mound systems.
Water Table: 10 to 30 feet in most developed areas; as shallow as 6 feet near Rio Grande bosque
Local Regulations
Bernalillo County Environmental Health and NMED jointly oversee onsite systems under 20.7.3 NMAC. East Mountain communities in the Estancia Basin have enhanced groundwater protections due to the sole-source aquifer designation. Systems must maintain 100-foot setbacks from private wells. NMED issues individual Liquid Waste Handler permits to installers. No statewide point-of-sale inspection requirement, but lenders commonly require one.
Bernalillo County Environmental Health Department issues septic permits for unincorporated county areas. City of Albuquerque is nearly fully sewered via ABQ WW. Unincorporated east mountain and West Mesa communities require NMED and county permits. Fees $350 to $650.