Government monitoring from 2013 to 2015 provides data on chromium-6 (hexavalent chromium) levels in the Sacramento Suburban Water District, a surface water source serving nearly 195,000 people over about 47,000 connections. This record shows chromium-6 was detected frequently, with a median level near 3.95 micrograms per liter (µg/L or ppb) and a highest measured value of 12.0 µg/L. However, these detections do not establish conditions in any individual residence. Only a specific test of your home’s water can establish your chromium-6 levels.
Why California set its own 10 µg/L limit and what that history means for a reader elsewhere
California introduced a 10 micrograms per liter standard for chromium-6 to address concerns about potential health risks associated with this contaminant. Unlike federal regulations, no enforceable federal maximum contaminant level (MCL) exists specifically for chromium-6, only for total chromium at 100 µg/L. The state limit reflects a precautionary approach based on state-specific assessments, not a federal safety requirement. Understanding this distinction helps households outside California or under municipal systems without a chromium-6 standard interpret their local data in context. Sacramento’s public water system has no health-based violations on record, affirming regulatory compliance with federal law.
How oxidation state changes between the well, the distribution main and the tap
Chromium-6, or chromium(VI), is an oxidation state of chromium that behaves differently than chromium(III). In the environment, chemical reactions and treatment steps may convert chromium(VI) to chromium(III) or vice versa. Since Sacramento Suburban Water District uses surface water sources, the variation in chromium species can be influenced by natural and treatment factors between the source and home taps. This means the chromium(VI) concentration measured in source water may not directly match what a household experiences at the faucet, emphasizing the importance of home water testing for precise results.
How ion exchange and reverse osmosis differ in what they do to chromium(VI) specifically
Households choosing equipment to address chromium-6 often compare ion exchange and reverse osmosis technologies. Ion exchange systems operate by exchanging chromium(VI) ions in water with other ions on a resin, effectively reducing chromium(VI) levels within the treated water. Reverse osmosis uses a semi-permeable membrane to physically separate contaminants, including chromium(VI), from water, providing broad-spectrum reduction. Each technology treats chromium(VI) differently: ion exchange offers targeted removal of specific ions like chromium(VI), while reverse osmosis reduces a wide range of dissolved substances, which may influence water chemistry and taste.
How the treated water differs at the tap once the documented technology is in place
When utilizing equipment such as the Autotrol Chromium-6 Filter, households can expect treated water at the tap to exhibit reduced levels of chromium(VI). The Autotrol System works specifically with ion exchange technology designed for chromium(VI), yielding water that meets or improves upon the regional measurements reported for Sacramento’s public water system. Treated water will typically show lowered chromium(VI) concentrations, contributing to improved aesthetic qualities like taste and staining potential, while maintaining compliance with applicable water quality standards.
Geogenic hexavalent chromium in arid and alkaline aquifers versus industrial plating sources
Hexavalent chromium can originate from natural geological sources or industrial activities. In many arid and alkaline aquifers, geogenic sources release chromium(VI) into groundwater through natural mineral weathering processes. This contrasts with localized industrial plating or manufacturing discharges, which may contribute chromium(VI) in urban areas. Sacramento’s surface water supply reflects a composite of natural and anthropogenic influences typical of its region. Understanding the source helps households evaluate the potential variability in chromium(VI) concentrations and decide on appropriate water treatment approaches.
In summary, the Sacramento Suburban Water District’s federal monitoring data provide an overview of chromium-6 occurrence on a system-wide scale but cannot specify household-level conditions. Residents concerned about chromium(VI) should obtain individual water testing to confirm their tap water quality. For those choosing water treatment equipment, ion exchange solutions such as the Autotrol Chromium-6 Filter offer a targeted method to address chromium(VI). This page references EPA data made available through the Safe Drinking Water Information System (SDWIS) public water system records for Sacramento Suburban Water District.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-08-19. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Sacramento Suburban Water District (CA3410001), CA: 244 results across 2 listed contaminants, 239 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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