Government water quality records for Madison Water Utility in Dane County, Wisconsin, show that chromium-6 is detectable in many water samples but always below total chromium limits set for safety. This data helps households understand chromium(VI) presence but not the exact level in their own tap water.
Myth: All chromium-6 in water originates from industrial contamination
The Madison Water Utility source is groundwater, with chromium-6 detection documented by the EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) between 2013 and 2015. Chromium-6 can arise from natural geologic sources, especially in alkaline and arid aquifers, rather than exclusively from industrial plating or manufacturing runoff. The Madison record does not differentiate origins but reflects combined influences in the groundwater.
Myth: Chromium-6 levels remain constant over time
Sampling was conducted over about nine months from early 2015 to late 2015. Recorded chromium-6 measurements ranged from below the reporting level (0.03 µg/L) up to 3.3 micrograms per liter (ppb), with many detections around 0.8 ppb. This range shows seasonal or multi-year fluctuations in chromium(VI) concentrations are possible, influenced by factors such as groundwater recharge, water demand changes, or source variation.
Myth: Household size or seasonal use does not affect chromium-6 exposure
While the Madison system serves over 100,000 connections, individual household water use can influence exposure details. Larger households may have different flow rates and water age in pipes, potentially affecting chromium-6 levels at taps. Seasonal or second homes might see variations due to sporadic water use affecting plumbing residence time and chromium speciation.
Myth: You can decide on treatment without specific water data
Before considering any chromium(VI) treatment, homeowners should obtain a certified water test specifically targeting chromium-6 or total chromium levels in their own water supply. This confirms whether chromium-6 concentrations warrant concern or treatment. Writing down details like water source type and previous testing results will assist in evaluating treatment needs.
Myth: All household water fixtures are equally affected by chromium-6
Chromium-6 is dissolved in water and therefore influences any water outlet, but appliances or fixtures with longer water contact times or filtration components first show effects. For example, water heaters, ice makers, or drinking water taps might differ in chromium levels depending on plumbing configuration and use patterns.
Myth: Chromium-6 presence unattended will always cause health issues
The detection of chromium-6 in Madison’s system is not a health violation, and total chromium levels remain far below the federal maximum contaminant level of 100 micrograms per liter. Nonetheless, long-term exposure to chromium(VI) may be a concern for some; thus, understanding your own water’s chromium levels and selecting appropriate treatment options, like a Fleck Chromium-6 Filter that ships ready to configure for home use, can provide reassurance.
Important: The data reflect system-wide measurements, not individual household water tests. Therefore, do not assume your own water matches system medians or maxima. Testing your own water is the only way to know the chromium-6 concentration in your home.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-29. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Madison Water Utility (WI1130224), WI: 116 results across 2 listed contaminants, 82 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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