Fleck Chromium-6 Filter

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If your household equipment is struggling to keep pace with chromium-6 in water drawn from wells or municipal connections in Black Hawk, Bremer, Butler, Grundy, Hardin, Jasper, Marshall, and Story counties in Iowa, you’re not alone. Homeowners served by the Central IA Water Association, covering these counties, face measurable chromium(VI) in the groundwater supply. Understanding how this constituent behaves and how to confirm your own water’s profile is key to managing your water treatment effectively.

How Ion Exchange and Reverse Osmosis Differ in Handling Chromium(VI)

Chromium-6, also called hexavalent chromium or Cr(VI), exists in water mainly as dissolved ions. Ion exchange processes use resins to selectively bind these ions, exchanging them for less problematic substances, which makes this approach effective for lowering chromium(VI) to levels below your household’s needs. Reverse osmosis (RO), by contrast, filters water through a fine membrane capable of blocking many dissolved solids, including chromium(VI), but with different throughput and maintenance demands. Ion exchange systems often offer higher flow rates and less water waste in this specific application compared to RO.

The Significance of California’s 10 µg/L (ppb) Chromium-6 Limit for Other Regions

California has set a public health goal of 10 micrograms per liter (parts per billion) for chromium-6, informing water providers and consumers about concentration targets driven by toxicological studies. This limit shapes awareness but does not function as a federal standard elsewhere. In the Central IA Water Association service area, chromium-6 readings from 18 separate samples ranged from just above 0.03 µg/L to a maximum of 0.617 µg/L. None of these concentrations approach the federal MCL for total chromium, set at 100 µg/L. These data show chromium(VI) is present but not at federally regulated levels, underscoring the importance of household-level measurements to assess your specific water.

Household Fixtures, Appliances, and Processes Primarily Affected by Chromium(VI)

Chromium-6 dissolved in water may first affect fixtures where water sits or passes through metal surfaces susceptible to staining or corrosion. Appliances like coffee makers, humidifiers, and ice machines can encounter aesthetic effects or buildup. While chromium(VI) itself is soluble, its interaction with plumbing components may lead to taste or discoloration changes noticed during daily use. Understanding where chromium(VI) interacts first guides targeted testing and treatment priorities.

Sequence to Confirm Chromium(VI) Levels: From Cost-Effective Checks to Laboratory Testing

• Begin with visual and taste observations for unusual staining or metallic taste at faucets.
• Review your water supplier’s latest public water system data, such as the EPA UCMR3 monitoring results for Central IA Water Association, to understand regional background levels.
• Obtain a certified laboratory water test that specifically measures chromium-6 concentration in your household water supply. Only this test can confirm your water’s actual chromium(VI) content.

Differentiating Chromium(VI) from Related Constituents: Avoiding Common Confusions

Chromium in water can be present in multiple oxidation states, primarily trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). While total chromium levels provide some information, they do not specify chromium-6 concentrations, which are the focus of health and aesthetic interest. The hexavalent form is more mobile and potentially more reactive. Additionally, chromium-6 should not be confused with other metals or substances that can also stain or affect water taste. Correct identification through proper testing is essential before deciding on treatment methods.

For households detecting chromium(VI) levels at or above the median concentrations found in the Central IA Water Association public water system record, the Fleck Chromium-6 Filter, employing the ion exchange Fleck System technology, ships ready to configure and is documented to address chromium-6 concentration reductions effectively. This product offers a direct purchase option to supplement your existing equipment and help keep up with chromium-6 levels in your residential water supply.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-03-30. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Central IA Water Association - Waverly (IA0990701), IA: 36 results across 2 listed contaminants, 31 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L