When you fill a glass from your Lexington tap, you probably don't notice chromium-6. Yet, this form of chromium is one of several constituents monitored by federal programs in your community water supply. Chromium-6, also known as hexavalent chromium or chromium(VI), is chemically distinct from trivalent chromium (chromium-3). Understanding which chromium form is in your water and their implications can help you weigh treatment choices effectively.
Trivalent versus hexavalent chromium: why a total-chromium result cannot answer the question
Standard water tests often report total chromium, which sums chromium-3 and chromium-6 concentrations. The City of Lexington’s public water system data shows total chromium detections with a median around 0.412 micrograms per liter (µg/L or parts per billion). However, these figures alone don’t reveal the proportion of chromium-6, the hexavalent form that is of particular interest. Since chromium-3 differs chemically and in its behavior from chromium-6, relying on total chromium results does not provide a clear picture of chromium-6 presence or levels.
What happens when this problem is left untreated for years, stated without exaggeration
Consistently consuming water with chromium-6 present, as detected in Lexington’s groundwater supply, does not automatically indicate a violation or unsafe condition under current federal regulations. However, depending on concentrations, long-term exposure to chromium-6 can become a concern worth addressing through treatment. Without intervention, chromium-6 remains in the water supplied to your home, without altering its appearance or taste noticeably.
The household or facility symptoms that do and do not point to this problem
Unlike some water issues, chromium-6 does not cause clear physical symptoms like discoloration, staining, or odor changes. If you notice rusty water, unusual tastes, or visible residues, these are unlikely linked directly to chromium-6 levels but might indicate other water quality factors. Detecting chromium-6’s presence requires specific testing beyond typical sensory observations.
What 'detected', 'median' and 'range' mean in the sampling record on this page
The City of Lexington’s monitoring under the EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) recorded chromium-6 in 34 out of 40 samples from May to November 2014, with a highest value of 0.6 µg/L and a median of detected samples at 0.346 µg/L. Here, 'detected' means the instrument measured a concentration above its reporting threshold (0.03 µg/L), not a violation. The 'median' identifies the middle value of detected concentrations, indicating typical levels, while 'range' describes the spread from lowest detected to highest concentration across samples.
How sample depth, well depth or source type changes what a reader should expect
These chromium-6 measurements come from groundwater sources supplying Lexington’s system. Variations in sample depth or well characteristics can affect chromium concentrations since hexavalent chromium levels can fluctuate depending on geological and chemical factors underground. For an individual household, only a specific test of your own well or tap water can determine chromium-6 concentration at your point of use, given that public water records represent averages across the broader system.
What the measured range means against the relevant federal standard, and what it does not mean
Currently, there is no federal maximum contaminant level (MCL) for chromium-6 specifically. The federal MCL applies to total chromium at 100 µg/L, which is much higher than any value detected in Lexington’s samples. Therefore, the measurements do not indicate a legal or safety violation. They provide data to assess water quality characteristics and inform choices about treatment technologies if reducing chromium-6 is desired.
This summary reflects chromium-6 monitoring for the City of Lexington’s public water system serving Dawson County, Nebraska, based on EPA data collected during 2014. For more detailed records, visit the EPA’s Safe Drinking Water Information System (SDWIS) website.
Among available options to address chromium-6 concerns, the Pentek Chromium-6 Filter ships ready to configure for residential use. It uses technology designed to reduce hexavalent chromium in household water, providing a targeted choice for those seeking treatment tailored to this specific form of chromium.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-11-18. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for City of Lexington (NE3104708), NE: 80 results across 2 listed contaminants, 67 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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