What Government Measurements of Chromium-6 Reveal—and What They Don’t
It is a frequent misunderstanding that detecting Chromium-6 in a municipal water supply means the water is unsafe or legally noncompliant. Public water system records for Waterford Township, Oakland County, MI, show that between 2013 and 2015, Chromium-6 was detected once above the laboratory reporting level of 0.03 micrograms per liter (µg/L), with the highest recorded value at exactly 0.03 µg/L. These measurements come from a federal occurrence survey and do not indicate a violation or safety concern, especially since there is no established federal maximum contaminant level (MCL) specifically for Chromium-6.
For comparison, total chromium in the same system showed up to 0.6 µg/L, well below the federal MCL of 100 µg/L. Therefore, detection here only evidences the presence of Chromium-6, not a hazard or breach of regulatory limits.
How Chromium-6 Levels Fluctuated Across the 2013–2015 Sampling Period
The sampling for Waterford’s community water system occurred over several months, from December 2013 through June 2014. During this time, 46 results were recorded for Chromium-6, with only one detection meeting the reporting threshold. The data does not demonstrate notable seasonal variation or an increasing trend; instead, it reflects generally low or undetectable levels. These limited detections suggest the constituent is not consistently elevated but can appear sporadically at trace levels within the groundwater-supplied system.
Why Commercial and Industrial Operators Monitor Chromium Differently
Unlike residential users, commercial and industrial water users must consider operational impacts, regulatory requirements, and potential discharge limits. These operators may test for total chromium and specific hexavalent chromium forms with greater frequency and sensitivity to comply with environmental regulations or protect equipment. Households typically need less frequent testing, focusing on point-of-entry treatment decisions informed by their own water's test results rather than area-wide occurrence data.
Scope and Limitations of Waterford’s Chromium-6 Sampling Data
The statistics represent 46 samples from a single public water system serving over 73,000 people via more than 24,000 connections. These samples encompass multiple wells and distribution points but do not provide information about any individual household’s tap water quality. The limited number of detections relative to total samples indicates that Chromium-6 presence is generally low or below detection limits in the system. However, variations in local plumbing, well depth, and seasonal groundwater conditions can cause differences at the point of use.
Understanding Your Laboratory Water Test for Chromium-6
A certified laboratory water test for Chromium-6 typically reports concentrations in micrograms per liter and will indicate whether the compound is below the detection limit or found at trace levels. Since no federal MCL specifically governs Chromium-6, the result primarily helps decide whether treatment is warranted based on personal preference or guidance from environmental health recommendations. Reading the report carefully helps clarify if levels are consistent with regional data or represent higher localized concentrations needing attention.
Next Step for Homeowners Concerned About Chromium-6
The most definitive action is to order a certified laboratory test of your own household’s water supply specifically for Chromium-6. This test clarifies whether your water aligns with or differs significantly from the local government’s system-level findings. If testing shows measurable levels and treatment is desired, the Fleck Chromium-6 Filter ships ready to configure and is engineered to reduce Chromium-6 effectively at the point of entry.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-06-03. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Waterford Township (MI0006910), MI: 92 results across 2 listed contaminants, 12 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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