This week, if you have concerns about chromium-6 in your household water from the public supply in NN, you face a decision about whether your water requires additional testing or treatment beyond what the water system monitors.
If you want to understand the limits of the UCMR3 federal survey data for your home water in NN
The EPA’s Third Unregulated Contaminant Monitoring Rule (UCMR3) survey conducted from 2013 to 2015 measured chromium-6 levels in the Ganado/Burnside/Steamboat/Cornfields/Woodsprings public water system. This federal occurrence survey gathered eight sample results, all detecting chromium(VI) at levels ranging from just above the 0.03 micrograms per liter (µg/L) reporting threshold up to 0.426 µg/L, with a median detected concentration at 0.315 µg/L (parts per billion). It’s important to note these measurements are for the overall system and do not represent any single household's water quality. The survey was not intended to establish compliance or health risk at the home level; it provides a snapshot of what EPA instruments detected in the system during the period.
If you want to know why total chromium levels cannot fully describe chromium-6 concerns
Chromium in water exists mainly in two forms: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI), also called chromium-6). The total chromium results in this system were also reported, with all eight samples detecting total chromium between 0.2 µg/L and 3.3 µg/L, median 0.298 µg/L. Because total chromium sums all forms, it does not distinguish the specific amount of hexavalent chromium, which is the form more often discussed in health and regulatory contexts. Thus, knowing total chromium does not answer the question of chromium-6 levels in your home water. Separate testing specifically for hexavalent chromium is necessary to understand its presence.
If you want to understand how public water system records differ from private well testing
Records for this public water system in NN represent aggregate data collected at system entry points, not home taps. They reflect the water system’s source and treatment but not the effects of home plumbing, fixture materials, or in-house processes. If you rely on a private well or want to know your specific tap water quality, you will need independent testing of your home’s water. Public system data describe what the source generally delivers, but cannot define the exact concentration you receive.
If you want to know how chromium’s oxidation state might change between the well, distribution, and tap
Chromium’s form can shift due to chemical reactions occurring naturally or through treatment and distribution. Hexavalent chromium is more soluble and mobile but may reduce to the trivalent form under certain conditions such as contact with organic materials or low oxygen environments in piping. Conversely, oxidation can convert some trivalent chromium back to hexavalent. These changes mean the chromium-6 measurement at the well or treatment plant outlet may differ from levels at your tap. This dynamic requires consideration when evaluating water testing results or treatment needs.
If you observe chromium-6 concerns in certain fixtures or appliances first, here is why
Certain water appliances like reverse osmosis filters or appliances with small passageways may be more sensitive to chromium-6 presence, potentially impacting their lifespan or performance. Likewise, fixtures with specific materials may experience discoloration or other aesthetic effects related to chromium compounds, although these are not health-based violations. Understanding where chromium-6 might manifest first in your home can guide targeted testing or treatment steps.
If you observe variability in chromium-6 levels depending on sample depth, well depth, or water source type
Chromium concentrations and forms can vary with the depth of well water sampling or source type, such as surface water versus groundwater. Deeper well samples may show different chemistry compared to shallow ones. The Ganado/Burnside/Steamboat/Cornfields/Woodsprings system data cover the public supply but do not capture this fine-grained variation at individual homes. Consequently, knowing sample or well depth relative to your home’s water source is useful for interpreting any private testing results.
What you should NOT conclude from area-wide chromium-6 data
While the Ganado/Burnside/Steamboat/Cornfields/Woodsprings water system’s public monitoring found detectable chromium-6, there have been zero EPA health-based violations recorded for this system. This means the system meets all EPA safety requirements concerning chromium compounds. You should not assume your home water contains identical levels or represents a health threat based on these area results alone. The only way to know your household water’s chromium-6 level is through specific testing conducted on your tap water.
If you choose to reduce chromium-6 levels in your home water, the Pentek Chromium-6 Filter ships ready to configure and has been documented as a viable approach to address hexavalent chromium presence through targeted water treatment technology.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-09. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Ganado/Burnside/Steamboat/Cornfields/Woodsprings (NN0403001), NN: 16 results across 2 listed contaminants, 16 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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