Decision Time: Addressing Chromium-6 After Your Equipment Has Failed
If your current water treatment equipment that dealt with chromium-6 recently stopped functioning, this week you need to evaluate what your water contains and how best to treat it going forward.
Why California’s 10 µg/L Chromium-6 Limit Matters Beyond Its Borders
California set a public health goal for hexavalent chromium (Cr(VI)) at 10 micrograms per liter (µg/L or ppb) to guide long-term exposure limits. This level is a health-based recommendation rather than a federal regulatory limit. In contrast, the EPA has not established a maximum contaminant level (MCL) specifically for chromium-6 nationwide, though it regulates total chromium with an MCL of 100 µg/L. For Franklin County residents served by the Columbus public water system, understanding California's threshold helps frame concerns about chromium-6 but does not dictate regulatory requirements locally.
Chromium-6 Variation Over Time: What the EPA Sampling Shows
Federal monitoring under the Unregulated Contaminant Monitoring Rule 3 (UCMR3) took place between March and December 2014 for the Columbus system. All 20 samples detected chromium-6 above the 0.03 µg/L reporting level, with concentrations ranging from the lowest detection up to 0.35 µg/L. The median detected chromium-6 concentration was 0.195 µg/L. These results indicate that chromium-6 is consistently present in the surface water source but remains well below California’s 10 µg/L goal and the total chromium MCL. Note that these values reflect system-wide measurements over several months and not a single home’s water quality.
Judging Treatment Capacity Against Your Household Water Use
When selecting or replacing water treatment equipment, it is critical to compare the system’s capacity to your household’s daily water demand. Typical residential water use varies but often averages around 80-100 gallons per person per day. Your treatment solution should be sized to handle peak demand without compromising effectiveness. Calculating this ensures the equipment can maintain control over chromium-6 concentrations throughout daily water use patterns, even during periods of increased consumption.
Changes in Chromium Oxidation State from Source to Tap
Chromium exists mainly in two oxidation states in water: chromium(III) and chromium(VI). The surface water source feeding Columbus’s system contains detectable chromium-6, which is the hexavalent form noted for higher mobility and different chemistry compared to trivalent chromium. Between the water source, distribution system, and home taps, oxidation state shifts can occur due to factors like water pH, presence of oxidizing or reducing agents, and residence time in pipes. This means the chromium species measured at the tap may differ slightly from those at the source, influencing treatment strategy.
How the Pentek Chromium-6 Filter Addresses Hexavalent Chromium
The Pentek Chromium-6 Filter is designed to reduce hexavalent chromium concentrations at the point of use. Utilizing specific filtration media, it targets chromium(VI) by converting or adsorbing it effectively, producing treated water suitable for household needs. This technology ships ready to configure and can be matched to your measured household water demand for optimal performance. Choosing this approach helps manage chromium-6 levels in your water following the failure of your previous equipment.
Moving Forward With Treatment
After confirming your household's daily water use, the Pentek Chromium-6 Filter offers a direct purchase solution sized to meet your demand. This allows for restoration of control over chromium-6 in your household water, based on documented EPA data for the Columbus system serving Franklin County.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-12-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Columbus (OH2504412), OH: 40 results across 2 listed contaminants, 37 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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