If Chromium-6 Concentrations Approach 10 Micrograms per Liter at Your Tap
California established a public notification level of 10 micrograms per liter (µg/L) or parts per billion (ppb) for chromium-6 based on studies considering potential health effects. This level is not a federal regulatory limit, nor is it currently enforced in Bernalillo County’s Albuquerque Water System. However, it serves as a reference point helping residents weigh treatment needs. While Albuquerque’s water system reported a maximum chromium-6 concentration of 7.3 µg/L in 2013-2015 sampling, no health-based violations exist in this system’s record.
If You Consider How Chromium Oxidation State May Shift from Source to Tap
Chromium in water can exist mainly as chromium-6 (hexavalent chromium, Cr(VI)) or chromium-3 (trivalent chromium). The public water supply in Albuquerque draws from surface waters where chromium-6 was detected in many samples. Along distribution and through plumbing, redox conditions can convert chromium species between states, potentially affecting overall chromium characteristics at the tap. Understanding these transformations is important because treatment effectiveness may vary depending on chromium’s chemical form.
If You Know the Depth and Type of Samples Influences Expected Chromium-6 Levels
Sampling by EPA under the Unregulated Contaminant Monitoring Rule (UCMR3) involved 76 measurements at public water system points, reflecting source and distribution samples rather than individual household taps. Surface source water tends to vary in chromium-6 levels compared to groundwater wells, and sample depth influences detected concentrations. Homeowners should note that regional data indicates likely presence of chromium-6, but local well depth or water source could differ substantially.
If You Are Planning a Stepwise Approach from Affordable Checks to Laboratory Analysis
Start by reviewing available public water system data for your area, then consider testing your own water selectively. Laboratory testing specifically for chromium-6 requires certified methods due to the constituent’s chemical complexity. Identifying your home's specific chromium-6 level and oxidation state is key to selecting an appropriate treatment approach. This avoids unnecessary expense and targets hexavalent chromium effectively.
If You Know Aesthetic Secondary Standards Differ from Health-Based Limits for Chromium-6
Secondary standards related to total dissolved solids or chloride in Bernalillo County regulate taste, staining, and corrosion but do not establish health-based limits for chromium-6. The EPA’s lack of a federal maximum contaminant level (MCL) for chromium-6 means these aesthetic guidelines do not dictate health risk assessments or treatment decisions. Understanding this distinction helps avoid conflating aesthetic water quality concerns with chromium-6 health evaluations.
Final Step: Order a laboratory test certified for chromium-6 analysis on your household water. A verified result will clarify local chromium-6 concentration and guide whether the targeted Pentek Chromium-6 Filter, which ships ready to configure, is an appropriate technical solution for your home’s water treatment needs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-14. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Albuquerque Water System (NM3510701), NM: 152 results across 2 listed contaminants, 144 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L