If you live in Wasilla or elsewhere in Matanuska-Susitna Borough, you may notice subtle metallic tastes or concerns about chromium-6 when checking your household water. Understanding what this hexavalent chromium means—and how it behaves in your area’s groundwater—can help you decide what steps to take next.
Geogenic hexavalent chromium in arid and alkaline aquifers versus industrial plating sources
In Wasilla’s public water system, which draws from groundwater, chromium-6 (also known as hexavalent chromium or Cr(VI)) was detected in federal monitoring between 2013 and 2015. The measurements showed values ranging from 0.03 to 0.25 micrograms per liter (µg/L), equivalent to parts per billion (ppb). These concentrations are typical of chromium-6 arising naturally in certain geologic settings characterized by alkaline and arid conditions. This contrasts with chromium-6 releases from industrial plating and manufacturing, which tend to be localized and at higher concentrations. Knowing the likely natural origin helps residents understand that the source is widespread groundwater rather than isolated pollution.
What questions a commercial or industrial operator adds that a household does not
Commercial and industrial water users often need detailed, ongoing analyses to comply with specific discharge limits or to prevent equipment corrosion. They may monitor combined chromium species more closely or track variations during production cycles. For typical households, the primary concerns revolve around basic safety and taste—questions best answered by testing the home's water specifically. Since federal monitoring results reflect system-wide averages and not individual taps, a household test is essential to confirm what the water coming into your property actually contains.
How the treated water differs at the tap once the documented technology is in place
Water-treatment technology designed for chromium-6, such as the C-Series Chromium-6 Filter, ships ready to configure for household use. This equipment is engineered to reduce chromium(VI) levels by utilizing filtration methods documented to address this specific constituent. Once operational, treated water at the tap may show improved taste and lowered chromium-6 concentrations compared to untreated sources. It's important to arrange for testing after setting up such technology to verify effectiveness for your home's water.
Why aesthetic secondary standards differ from health-based limits, applied to this constituent
For chromium-6, federal rules do not set a maximum contaminant level (MCL), but there is a total chromium MCL of 100 µg/L for combined chromium forms. The local detection levels in Wasilla's water are well below this threshold. Additionally, aesthetic secondary standards exist to address issues like taste, staining, and corrosion, but these do not signal health hazards. For chromium-6, aesthetic concerns might include slight metallic taste or discoloration linked to total dissolved solids or chloride levels rather than hexavalent chromium itself. Understanding these distinctions helps households interpret water quality data without undue alarm.
What the UCMR3 nationwide survey was designed to learn, and its limits for one household
The third Unregulated Contaminant Monitoring Rule (UCMR3) survey conducted by the EPA from 2013 to 2015 aimed to gather occurrence data for contaminants like chromium-6 across public water systems nationwide. Its intent was to inform future regulations by establishing baseline measurements rather than serving as a compliance or safety test. The data for Wasilla's system reflects aggregate results, sampling multiple points over time. For an individual household, this information does not substitute for private well or tap water testing. It also does not establish any violation or unsafe status but merely documents what was measured within the system.
In conclusion, the public water system record for Wasilla in Matanuska-Susitna Borough shows that chromium-6 is present in the groundwater supply at low levels below any federal health-based limits. This information comes from EPA’s public water system data under the Safe Drinking Water Information System and the Unregulated Contaminant Monitoring Rule. For homeowners seeking to manage chromium-6 concern, testing their own water and using proven treatment technology such as the C-Series Chromium-6 Filter can clarify actual water quality at the tap and provide improved household water.
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