California’s 10 Microgram per Liter Limit and Its Implications for Salt Lake
California has established a regulatory level of 10 micrograms per liter (µg/L), or parts per billion (ppb), for hexavalent chromium (chromium-6) in drinking water based on health considerations and scientific studies. Although this limit is not federally mandated and does not apply in Utah, it offers a reference point for understanding chromium-6 concentrations in water sources elsewhere. Residents in Salt Lake can use this benchmark to compare their water test results but should recognize that local water quality regulations and health advisories may differ.
Sources of Hexavalent Chromium: Natural Versus Industrial Origins
Hexavalent chromium occurs in water from both natural and human-made sources. In arid and alkaline aquifers like those found in parts of Utah, geogenic processes can release chromium(VI) into groundwater. Conversely, industrial activities such as plating and manufacturing facilities can contribute chromium-6 to water supplies via surface water or runoff. Salt Lake City's water system, relying on surface water sources, might reflect a mix of these influences but without indicating a specific source for any individual household.
Public Water System Records Versus Private Well Testing: What Each Shows
Data from Salt Lake City’s public water system, serving over 380,000 individuals, reflect aggregate measurements from multiple sample points across the system. These comprehensive records provide insights into general water quality trends for the area but do not establish the chromium-6 concentration in any one home or connection. Conversely, a private well test directly measures the water at a specific point of use, giving definitive information about that household’s chromium-6 levels. Homeowners concerned about chromium-6 should consider obtaining a precise sample from their own water supply for accurate analysis.
Interpreting Median and Range Values from Salt Lake City’s Data
Government sampling in Salt Lake City from 2013 to 2015 detected chromium-6 in 35 out of 37 tested samples, with a median detected concentration of 0.35 µg/L (ppb) and a highest measurement of 2.0 µg/L. These concentrations fall well below California’s 10 µg/L reference level and far below the federal total chromium maximum contaminant level of 100 µg/L. Such figures indicate measurable but low levels present in the public water supply, providing a framework for homeowners to evaluate their own water quality once they have testing results specific to their residence.
How Chromium-6 Enters Salt Lake’s Drinking Water
In Salt Lake County, chromium-6 can dissolve from natural mineral deposits into surface water sources used by the municipal water system. The region’s geology and water chemistry—including factors like pH and oxidation conditions—affect chromium species mobility. Additionally, urban runoff and historic industrial sites may contribute chromium compounds to surface waters feeding the system. Understanding these pathways helps explain why chromium-6 appears in system monitoring, reflecting environmental and anthropogenic influences rather than household plumbing factors.
In summary, public water system data reveal detectable chromium-6 in Salt Lake’s water but at levels significantly lower than certain state health reference points. Residents cannot know their own water’s chromium-6 content without specific testing but can use these data as a contextual guide. For households seeking to address chromium-6 presence, equipment such as the Fleck Chromium-6 Filter ships ready to configure and offers a documented approach to managing chromium(VI) in residential water supplies.
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 Salt Lake City Water System (UTAH18026), UT: 74 results across 2 listed contaminants, 65 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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