The EPA's public water system record for the Dona Ana MDWCA in Dona Ana County, NM, reports detections of several PFAS compounds in the groundwater supply serving nearly 17,000 people. This record covers the system as a whole, not individual household water, and provides essential context for understanding potential PFAS presence in your water.
1. Firefighting Foam, Textile Finishing, and Landfills: Which PFAS Sources Align with Dona Ana's Record?
PFAS, or per- and polyfluoroalkyl substances, are synthetic chemicals used in many industrial and consumer products, notably in firefighting foam, textile finishing, and waste management. Dona Ana’s groundwater-based public water system has documented the presence of PFOS and PFBS among other fluorinated compounds, which are commonly associated with these sources. While this data confirms PFAS presence in the area’s water supply, it does not specify contamination from any particular source within the county.
2. Which Fluorinated Compounds Have 2024 Federal Maximum Contaminant Levels?
Federal regulations effective in 2024 have established maximum contaminant levels (MCLs) for certain PFAS chemicals to guide water quality management. In Dona Ana’s data, PFOS and PFOA now have federal MCLs at 4.0 nanograms per litre (ng/L) or parts per trillion (ppt) and 4.0 ng/L respectively. Other detected compounds like PFBS do not currently have federal MCLs. This distinction informs which compounds are subject to enforceable standards and which are monitored for informational purposes.
3. What Does Dona Ana’s PFAS Measurement Range Indicate Relative to Federal Standards?
The federal occurrence survey found 1 result for PFOS slightly above the reporting level at 0.0042 µg/L (4.2 ng/L), just exceeding the new federal MCL of 4.0 ng/L. Detections for other compounds were below their respective MCLs or reporting thresholds. It’s important to understand these detections are measurements, not violations, and do not alone define water safety or quality for homes. They indicate the chemicals were present in trace amounts within the public system's groundwater source during sampling.
4. Why Are Public Water System Records Different from Private Well Testing?
The data discussed originates from sampling the public water system, which aggregates water from multiple sources to serve thousands of connections. This means the reported PFAS levels represent system-wide averages or detection events, not individual households. Private wells, which vary significantly geographically and in depth, can have different PFAS concentrations and require direct testing to accurately assess local water quality.
5. Why Are PFOA and PFOS Measured in Nanograms per Litre and Recorded to Four Decimal Places?
PFAS compounds like PFOA and PFOS are measured at extremely low concentrations due to their potency and persistence. Nanograms per litre (ng/L), equivalent to parts per trillion (ppt), indicate one unit of chemical per trillion units of water. Recording values to four decimal places reflects the precision needed to detect these trace amounts accurately and informs regulatory action based on tight safety margins.
6. How Do Granular Carbon Beds and Ion-Exchange Resins Differ in PFAS Treatment?
Two documented technologies address PFAS in water: granular activated carbon (GAC) and ion-exchange resins. GAC filters adsorb many PFAS compounds from water, effectively lowering concentrations of longer-chain substances like PFOA and PFOS. Ion-exchange resins are designed to selectively capture charged PFAS molecules and can target certain compounds that GAC may miss. Understanding these differences is critical when choosing a suitable treatment method for your household based on detected compounds and concentrations.
Choosing the right class of treatment for PFAS in Dona Ana’s water involves matching the documented concentrations you measure in your household with reliable technology. The Pentair PFAS Forever Chemicals Filter directly addresses 'forever chemicals' detected in your area, utilizing advanced filtration media that reduce PFAS levels effectively. This system ships ready to configure for home use, supporting your efforts to improve water quality based on federal occurrence data and your personal water test results.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-06-18. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for DONA ANA MDWCA (NM3554307), NM: 200 results across 10 listed contaminants, 2 detections above the reporting level; 1 results above a 2024 federal MCL
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