1. The Purpose and Limits of the UCMR3 Survey for Your Home's Water
The UCMR3 (Unregulated Contaminant Monitoring Rule) survey was conducted nationwide from 2013 to 2015 to gather data on contaminants not yet regulated by federal standards. For Salt Lake County's Murray City Water System, serving over 38,000 people from groundwater sources, this monitoring included chromium-6 levels to better understand its occurrence in public water supplies.
It is important to note that the UCMR3 results represent system-wide measurements; they are not indicative of the exact chromium-6 concentration in your individual household's water. Water quality can vary between connections, so testing of your own water is required for precise information.
2. Trivalent versus Hexavalent Chromium: Why Total Chromium Data Isn’t Enough
Chromium exists mainly in two forms relevant to water: trivalent chromium (chromium-3) and hexavalent chromium (chromium-6). Total chromium measurements combine both forms but do not clarify their individual levels.
This distinction matters because chromium-6 and chromium-3 behave differently chemically and have separate considerations for water treatment. The Murray City Water System recorded total chromium concentrations as well as chromium-6 separately, offering a clearer picture of the hexavalent chromium present in the supply.
3. What Changes at the Tap After Using a Specialized Chromium-6 Filter
When a household employs the C-Series Chromium-6 Filter designed for addressing hexavalent chromium, the water experienced at the tap differs notably. This advanced filtration technology targets chromium-6 specifically, helping to reduce its presence in the water delivered for consumption and use.
The filter ships ready to configure for residential plumbing setups, designed to function efficiently with municipal groundwater supplies like those in Salt Lake County. It does not alter the water’s total chromium content directly but focuses on reducing chromium(VI) levels, improving the aesthetic and chemical profile of water.
4. Interpreting the Murray City Water System’s Median and Range of Chromium-6 Levels at Home
The government record shows 37 tested samples, with 33 detecting chromium-6 above the reporting threshold of 0.03 micrograms per liter (µg/L or parts per billion). The highest measured concentration was 1.51 µg/L, and the median level among detections was 0.629 µg/L.
For a household, these figures suggest that chromium(VI) is measurable in the system's water but do not specify what is in your tap water. Understanding where your water sits within that range requires personal testing. This median reflects a middle-ground concentration typical of the supply under study, not a violation or indication of unsafe water.
5. Additional Considerations for Commercial and Industrial Water Users in Salt Lake County
While residential households focus mainly on the presence and treatment of chromium-6 for health and taste concerns, commercial and industrial operations may need to consider further queries about water use. These can include compliance with workplace safety standards, effects on manufacturing processes, and potential impacts on equipment.
Such operators often require more frequent and specialized testing protocols beyond the scope of household needs, addressing chromium forms and other contaminants relevant to their specific activities.
Conclusion: The Single Test That Clarifies Your Household’s Chromium-6 Status
The key step for any Salt Lake County household concerned about chromium(VI) is to order a test specifically measuring hexavalent chromium in your water supply. This test differs from total chromium assessments and directly informs whether the levels in your tap water warrant targeted action.
If your results indicate measurable chromium-6, the C-Series Chromium-6 Filter is a proven option to help optimize the quality of your water by addressing this constituent effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-03-27. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Murray City Water System (UTAH18024), UT: 74 results across 2 listed contaminants, 64 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L