What the UCMR3 Nationwide Survey Tells Us—and What It Doesn’t for Homes in Salt Lake County
The U.S. EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) gathered data on chromium-6 in many water systems nationwide, including Jordan Valley Water Conservancy District (Jordan Valley WCD) serving Salt Lake County. Sampling was conducted from 2013 to 2015 on the public water system level. Results showed chromium-6 was detected in 32 of 34 samples, with a highest measured concentration of 4.212 micrograms per liter (µg/L) or parts per billion (ppb) and a median of 0.2505 µg/L. It is important to note that these measurements reflect the water system’s supplied water, not the water inside any individual home.
This data does not represent a compliance test or a violation; it is part of a federal survey designed to observe occurrence and provide context for future regulations. Household plumbing and local conditions can alter chromium-6 levels at the tap, so individual testing is necessary to know the exact water quality inside any residence.
Trivalent vs. Hexavalent Chromium: Why Total Chromium Numbers Can Be Misleading
The UCMR3 also reported total chromium concentrations for the system, with 20 of 34 samples detecting chromium above 0.2 µg/L and a highest level of 3.241 µg/L. However, total chromium includes both trivalent chromium (chromium III) and hexavalent chromium (chromium VI). These two forms have different chemical behaviors, bioavailability, and potential effects.
Understanding chromium-6 specifically is critical for treatment decisions because it differs significantly from chromium(III) in how it interacts with water and human health. Total chromium measurements cannot distinguish between these forms, so relying solely on total chromium data does not provide a clear picture of hexavalent chromium presence.
How Chromium-6 Reaches Surface Water and Distribution Systems in Salt Lake County
Chromium-6 in Jordan Valley WCD’s supply originates from surface water sources influenced by natural mineral deposits and historical industrial activities within the watershed. This form of chromium can enter the water cycle as particles or dissolved ions. Water treatment processes at the plant and distribution system management influence its final concentration delivered to customers.
Understanding this pathway helps households consider treatment that specifically targets chromium(VI), because different water sources and treatment plant methods affect constituent profiles and levels inside community water systems.
Distinguishing Chromium-6 from Other Commonly Confused Water Concerns
Chromium-6 should not be confused with contaminants like total dissolved solids, chloride, or other metals often monitored in water. Its behavior, presence as a specific oxidation state of chromium, and the way it interacts with treatment technologies are unique.
Awareness of regulatory standards confirms no federal maximum contaminant level (MCL) exists specifically for chromium-6, unlike total chromium which has an MCL of 100 µg/L. Recognizing what measurements reflect and what standards apply ensures realistic expectations about water quality and treatment needs.
Additional Considerations for Commercial and Industrial Water Users in Salt Lake County
Commercial and industrial operations may need to consider chromium-6 in the context of discharge permits, process water quality, and occupational safety requirements. While these uses often demand further testing and monitoring, residential households primarily focus on drinking water quality and selecting suitable treatment for their tap water.
This distinction clarifies why household decisions center on whether targeted chromium(VI) reduction is necessary based on individual water tests rather than system-wide occurrence data alone.
The Definitive Step: Testing Your Water for Chromium-6 to Inform Treatment Choices
The only way to determine your household’s chromium-6 level is to have your water tested specifically for hexavalent chromium (Cr(VI)). This test differentiates chromium-6 from other chromium forms and quantifies its concentration at your tap.
Knowing your exact chromium-6 concentration enables you to select the appropriate class of water treatment. For homes in Salt Lake County looking to address chromium-6, the C-Series Chromium-6 Filter is a document-supported option designed to specifically reduce hexavalent chromium from water. This system ships ready to configure for residential use and can help households manage chromium-6 based on their individual water quality results.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-02-19. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Jordan Valley WCD (UTAH18027), UT: 68 results across 2 listed contaminants, 52 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L