Sandoval County, New Mexico: drinking water report. Sandoval County spans from Albuquerque's northern suburbs through Rio Rancho to the Jemez Mountains,…
Sandoval County spans from Albuquerque's northern suburbs through Rio Rancho to the Jemez Mountains, encompassing communities like Corrales, Bernalillo, and Placitas. Most residents rely on groundwater from the Santa Fe Group aquifer or surface water diversions from the Rio Grande, with Rio Rancho operating one of the state's larger municipal water systems. The county's mix of rapid suburban growth and agricultural land creates distinct water quality challenges across different areas.
New Mexico's northern counties face documented concerns with both naturally occurring contaminants and legacy pollution. Arsenic appears in many wells across Sandoval County due to the region's volcanic geology, with some areas recording levels above EPA's 10 parts per billion standard. Uranium contamination from historic mining operations near the Navajo Nation boundaries and in the Grants Mineral Belt has affected groundwater in certain zones, though most municipal supplies undergo treatment to reduce these levels.
PFAS monitoring under the EPA's latest testing requirements has identified these chemicals in water systems serving parts of the Albuquerque metro area, and Sandoval County's proximity to Kirtland Air Force Base and other military facilities raises similar concerns. Per- and polyfluoroalkyl substances have been detected in some Rio Grande monitoring points, though comprehensive county-wide data remains incomplete. The state began requiring utilities to test for PFAS in 2023, so more information should emerge over the next year.
Nitrate contamination from septic systems and agricultural runoff affects some well water in rural areas, particularly in the East Mountains and around older subdivisions where homes depend on private wells. Lead in drinking water primarily traces to older housing stock in Bernalillo and parts of Rio Rancho built before lead pipe bans, though service line inventory data for the county shows ongoing assessments. The region's hard water (high mineral content) can accelerate corrosion in aging plumbing systems.
If you use a private well, test annually for arsenic, nitrates, and uranium through the state health department or a certified lab. Municipal water customers can request recent testing results from their utility and consider point-of-use filtration for PFAS or lead reduction. Check your water for current contamination data in your area, review our water filter guide for systems that address specific contaminants, download your detailed report to see testing results for your ZIP code, or visit the New Mexico state page for broader context on regional water quality patterns.
Drinking water is one exposure route. These federal datasets also cover Sandoval County, NM.
The EPA places Sandoval County, NM in Zone 2 - a moderate-risk category, with a predicted average indoor radon level between 2 and 4 pCi/L. Zone maps predict an area's radon potential from geology and existing indoor readings; they say nothing about a specific house. Testing is the only way to know your own level.
21% of homes in Sandoval County, NM were built before 1980, and 2% before 1950. Residential lead paint was banned in 1978, so housing age is the strongest available proxy for lead-paint exposure. This describes the county's housing stock, not any one home.
Modelled annual fine-particle pollution (PM2.5) in Sandoval County, NM averages 5.7 µg/m³, within the EPA's annual standard of 9 µg/m³. These are CDC modelled county estimates rather than readings from a specific monitor.
How radon zones work · Air quality by county · Lead exposure guide