Step 1: Understanding Your Laboratory Test Report for Chromium-6
When you receive a water laboratory report that includes chromium-6 (also known as hexavalent chromium, chromium(VI), or Cr(VI)), the figures reflect concentrations measured in micrograms per liter (µg/L), which is equivalent to parts per billion (ppb). For households served by the Wasilla Water System in Matanuska-Susitna Borough, EPA monitoring from 2013 to 2015 found chromium-6 in 11 out of 12 samples, ranging up to 0.25 µg/L with a median of 0.07 µg/L. These measurements are from the public water system level, providing a regional snapshot rather than results specific to your home’s water.
Step 2: Why California’s 10 µg/L Limit Matters Beyond Its Borders
California has established a public health goal of 10 µg/L for hexavalent chromium, a benchmark aiming to limit potential long-term exposure. While this is a state-specific guideline and not a federal enforceable limit, it helps frame the regulatory context when assessing chromium-6 levels elsewhere. For Wasilla, the detected levels in the system are well below this advisory value, but individual homes could vary, so testing remains essential for personalized understanding.
Step 3: Trivalent Chromium Versus Hexavalent Chromium – Why Total Chromium Alone Is Insufficient
Tests for total chromium measure both the trivalent form (chromium-3) and hexavalent chromium combined. Since chromium-3 and chromium-6 have different chemical properties and health considerations, knowing total chromium does not clarify chromium-6 content. For instance, Wasilla’s public water system recorded total chromium up to 1.9 µg/L, but this figure does not specify how much is chromium-6. Only a targeted chromium-6 test reveals that detail, guiding treatment decisions accurately.
Step 4: How the Fleck Chromium-6 Filter Manages Chromium(VI)
This filter employs a proven technology designed to address chromium-6 detected in water. The equipment uses specialized media that adsorb chromium-6 from the water as it passes through. By reducing dissolved chromium-6 concentrations, the Fleck Chromium-6 Filter helps households seeking to lower their chromium-6 exposure. The system ships ready to configure, allowing you to set it up tailored to your water needs.
Step 5: Maintenance Rhythm for the Fleck Equipment in Practical Terms
Maintaining this chromium-6 filter involves periodic replacement of the media material that traps chromium-6, ensuring the filtration effectiveness remains consistent. The replacement interval depends on water usage and chromium-6 concentrations, but typical maintenance is straightforward, enabling ongoing operation without complex service tasks.
Step 6: Sources of Hexavalent Chromium: Geogenic Versus Industrial Origins
Hexavalent chromium in groundwater can originate from natural geochemical processes or from industrial contamination. In arid and alkaline aquifers, geogenic chromium(VI) occurs naturally due to rock composition and groundwater chemistry. Industrial processes, such as metal plating, can also introduce chromium-6 into water sources, but Wasilla’s water system uses groundwater with no reported industrial chromium-6 contamination. Understanding these sources informs whether chromium-6 presence is likely persistent or fluctuating.
Closing the Assessment: What the Wasilla Water System Record Indicates
The Wasilla Water System serves about 18,492 people in Matanuska-Susitna Borough, drawing water from groundwater sources. EPA’s data reflect measurements at the system level, not at individual taps. While chromium-6 is regularly detected at low concentrations within the system, the values remain well below health-based advisory levels like California’s 10 µg/L benchmark. For precise knowledge, homeowners should test their own water for chromium-6 to determine if treatment with technologies such as the Fleck Chromium-6 Filter is appropriate. More detailed information and official data are available from the EPA’s public water system records.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-01-06. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Wasilla Water System (AK2224646), AK: 24 results across 2 listed contaminants, 13 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L