Private Well Water Testing in New Mexico
County-by-county USGS area-risk estimates for private wells across New Mexico — arsenic exceedance probability and private-well population — plus how to test your own well at a New Mexico-certified laboratory.
New Mexico private-well risk summary
Counties covered
33
New Mexico counties with modeled risk data.
People on private wells
area estimate266,717
estimated across covered New Mexico counties.
Average arsenic risk
area estimate11%
average modeled chance a well exceeds 10 µg/L arsenic across covered counties.
New Mexico counties
- Santa Fe County9% arsenic exceedance (area estimate)28,992 people on private wells
- Valencia County50% arsenic exceedance (area estimate)27,901 people on private wells
- Bernalillo County30% arsenic exceedance (area estimate)27,612 people on private wells
- Doña Ana County11% arsenic exceedance (area estimate)20,776 people on private wells
- Sandoval County11% arsenic exceedance (area estimate)16,277 people on private wells
- Rio Arriba County5% arsenic exceedance (area estimate)16,007 people on private wells
- Taos County10% arsenic exceedance (area estimate)15,130 people on private wells
- San Juan County9% arsenic exceedance (area estimate)10,703 people on private wells
- Lea County16% arsenic exceedance (area estimate)10,217 people on private wells
- McKinley County8% arsenic exceedance (area estimate)9,383 people on private wells
- Chaves County6% arsenic exceedance (area estimate)8,114 people on private wells
- Luna County14% arsenic exceedance (area estimate)7,925 people on private wells
- Grant County12% arsenic exceedance (area estimate)7,515 people on private wells
- Torrance County11% arsenic exceedance (area estimate)7,490 people on private wells
- Otero County4% arsenic exceedance (area estimate)7,458 people on private wells
- San Miguel County4% arsenic exceedance (area estimate)5,716 people on private wells
- Curry County18% arsenic exceedance (area estimate)5,561 people on private wells
- Roosevelt County30% arsenic exceedance (area estimate)4,071 people on private wells
- Lincoln County4% arsenic exceedance (area estimate)3,965 people on private wells
- Socorro County21% arsenic exceedance (area estimate)3,878 people on private wells
- Cibola County11% arsenic exceedance (area estimate)3,870 people on private wells
- Eddy County6% arsenic exceedance (area estimate)3,519 people on private wells
- Sierra County9% arsenic exceedance (area estimate)2,757 people on private wells
- Catron County12% arsenic exceedance (area estimate)2,257 people on private wells
- Mora County3% arsenic exceedance (area estimate)1,814 people on private wells
- Union County5% arsenic exceedance (area estimate)1,784 people on private wells
- Hidalgo County9% arsenic exceedance (area estimate)1,513 people on private wells
- Quay County7% arsenic exceedance (area estimate)1,441 people on private wells
- Colfax County3% arsenic exceedance (area estimate)1,356 people on private wells
- Guadalupe County6% arsenic exceedance (area estimate)869 people on private wells
- De Baca County16% arsenic exceedance (area estimate)428 people on private wells
- Harding County5% arsenic exceedance (area estimate)320 people on private wells
- Los Alamos County5% arsenic exceedance (area estimate)98 people on private wells
Find a New Mexico-certified testing lab
Get your well tested at a New Mexico-certified laboratory. We list certification programs by state.
These figures are USGS area estimates: statistical groundwater models describing how likely elevated contaminant levels are across a county. They are not designed to predict the concentration in any single well. Only testing your own well reveals its water quality.
By TapWaterData Editorial
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