This week, if your household water treatment has failed and you are concerned about chromium-6 (hexavalent chromium) in your tap water, you face important decisions about testing and treatment. Understanding what government sampling shows for the Wasilla Water System in Matanuska-Susitna Borough helps direct your next steps while clarifying what can and cannot be concluded about your home's water quality.

If You Know the Source of Hexavalent Chromium Is Likely Geogenic or Industrial

Within Matanuska-Susitna Borough, groundwater supplies the Wasilla Water System. Sampling from 2013 to 2015 by the EPA's Unregulated Contaminant Monitoring Rule (UCMR3) found chromium-6 present in most samples at concentrations ranging from 0.03 to 0.25 micrograms per liter (µg/L, or parts per billion). While hexavalent chromium can originate from natural rock formations in certain arid or alkaline aquifers, it may also come from industrial plating or manufacturing sources.

Determining whether your local chromium(VI) presence is primarily natural or influenced by industrial activity can affect long-term expectations. This distinction influences how variable concentrations might be and what treatment methods will be most effective.

If You Are Comparing Ion Exchange and Reverse Osmosis for Chromium(VI) Control

Two commonly considered water treatment technologies for chromium-6 control include ion exchange and reverse osmosis. Ion exchange systems target specific ions and can be effective for removing chromium(VI) by swapping these ions with less harmful ones. Reverse osmosis works by forcing water through a semipermeable membrane that blocks many dissolved constituents, including chromium-6.

Ion exchange often requires ongoing maintenance to regenerate capacity, especially in areas with variable water chemistry, while reverse osmosis can provide a physical barrier but may produce wastewater. Both can be configured to address chromium(VI) at residential scales but differ in operational demands and water use efficiency.

If You Consider How Chromium’s Oxidation State May Change Between Well and Tap

Hexavalent chromium (Cr(VI)) can transform chemically as water moves from the original groundwater source through distribution mains to the tap. Oxidation or reduction reactions influenced by mineral content, organic matter, and sanitation practices may convert chromium(VI) to trivalent chromium (Cr(III)) or vice versa.

Since only testing of your own household water can determine your specific chromium-6 concentration, understanding these chemical changes clarifies that area sampling informs about system-wide occurrence but not individual home conditions.

If You Manage a Large Household, Own a Second Home, or Have Seasonal Water Use

Homes with higher water demand or sporadic use due to seasonality may face different treatment challenges. For example, larger households may require equipment sized for greater flow rates or increased capacity. Seasonal properties may experience stagnant water in pipes, potentially affecting chromium oxidation states or other water quality factors.

Planning for these conditions involves assessing your household’s specific water needs and usage patterns to select an appropriate solution that ships ready to configure.

If You Prepare Notes Before Requesting Treatment Options

Before seeking treatment advice, it is helpful to document:

• Your water source type (e.g., public water system or private well)
• Results of any recent water tests indicating chromium-6 or total chromium levels
• Current treatment equipment details and the nature of its failure
• Household size and water usage patterns
• Any additional water quality characteristics or concerns you have noticed

Such information focuses the consultation on your circumstances while making clear what the Wasilla Water System’s EPA monitoring record shows and does not.

If You Understand Why Aesthetic Secondary Standards Differ from Health-Based Limits for Chromium-6

The federal EPA record for the Wasilla Water System shows no health-based violations for chromium-6; federal regulations set no maximum contaminant level (MCL) for chromium-6 specifically, only for total chromium at 100 µg/L. The detected chromium-6 concentrations in this system, while measurable, are well below that total chromium limit.

Secondary standards relate to water’s taste, staining potential, or corrosivity, and exceeding them is not a health violation. Recognizing this distinction helps prevent misinterpreting detection as a safety concern and frames treatment as a choice for water quality preferences or equipment protection rather than emergency response.

Overall, government sampling for the Wasilla Water System in Matanuska-Susitna Borough describes chromium-6 occurrence in groundwater sources supplying public water. This data applies to the system broadly and does not substitute for household-level testing. For tailored treatment following equipment failure, options including the C-Series Chromium-6 Filter ship ready to configure and address chromium(VI) specifically.

Learn more about your area’s water quality from the EPA’s public water system records at their official website.

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