Residential Chromium-6 Concerns in Maui: Water Chemistry and Treatment Options in Wailuku
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Wailuku's Water Supply and Chromium-6 Presence
The Wailuku public water system in Maui County uses surface water sources to serve over 74,000 residents through more than 20,000 connections. Federal water quality monitoring has detected chromium-6, also known as hexavalent chromium or chromium(VI), consistently in water samples taken within this system.
Although chromium-6 was detected in every tested sample during the EPA's Unregulated Contaminant Monitoring Rule 3 (UCMR3) survey from 2014 to 2015, no federal maximum contaminant level (MCL) exists for this specific form of chromium. The total chromium MCL remains at 100 micrograms per liter (µg/L), or parts per billion (ppb), which is well above the highest chromium-6 value recorded in this system (2.9 µg/L).
How Oxidation State Shifts Affect Chromium-6 Between Source and Tap
Chromium Forms Can Change Along the Distribution Path
Chromium in water appears mainly in the trivalent [Cr(III)] and hexavalent [Cr(VI)] states. The EPA’s 2014–2015 results for Wailuku show chromium-6 is stable enough to be measured after surface water treatment and distribution, but chemical and physical changes can convert hexavalent chromium to other forms before water reaches your tap. These transformations depend on water chemistry factors such as pH, oxidation-reduction potential, and the presence of organic matter.
Implications for Testing Residential Water
A household’s chromium-6 level requires direct testing of that home’s water supply. Regional data cannot establish your water’s exact concentration because changes occur within both public and private distribution pipes. Testing a sample taken directly from your tap is necessary to determine what specific treatment approach to consider.
Maintaining Effective Chromium-6 Treatment
Simple Periodic Attention Supports Technology Performance
Equipment like the Pentair Chromium-6 Filter ships ready to configure for home use. Maintenance consists primarily of regular monitoring of filter condition and performing replacement or rejuvenation actions according to the manufacturer’s guidance. Keeping track of the system's performance ensures consistent reduction of chromium-6 and associated chromium(VI) compounds.
Understanding the Purpose and Limitations of UCMR3 Monitoring
Federal Sampling Explored Chromium-6 Prevalence in the Water System
The UCMR3 survey collected water samples from public systems nationwide to assess the occurrence of contaminants not yet subject to regulatory limits, including chromium-6. In Wailuku’s system, 87 samples yielded detections at or above 0.03 µg/L, with a median concentration of 1.2 µg/L. This data provides a broad regional picture rather than specific conditions at any individual home.
Limitations for Household Application
The federal data is not intended to diagnose individual water quality at a residence. Variations may exist due to plumbing materials, water age in the distribution system, and local water chemistry. Thus, the survey results should inform but not replace household water testing for chromium(VI).
Information to Gather Before Selecting Treatment
Document Your Water’s Chromium-6 Level
Arrange for a certified laboratory to measure chromium-6 specifically at your tap, expressed in micrograms per liter or parts per billion. Knowing this figure is critical in choosing a technology matched to the chromium(VI) demand your water presents.
Identify Other Water Quality Parameters
Request analysis for total chromium and other potential constituents that influence chromium chemistry in water. Understanding factors like pH, oxidation potential, and total dissolved solids contributes to an effective treatment approach.
Consider Household Water Usage Rates
Estimate your daily water consumption to ensure the treatment capacity aligns well with your household needs without frequent service or filter changes.
Why California Established a 10 µg/L Chromium-6 Guideline
Precautionary Environmental Health Measure
California set a public health goal of 10 µg/L for chromium-6 based on toxicological studies, not as a federally enforceable maximum contaminant level. This guideline reflects an abundance of caution but applies specifically to California.
Implications for Maui Residents
Wailuku’s federal monitoring shows chromium-6 concentrations mostly below this level, but residents may use this benchmark for personal water treatment decisions rather than regulatory compliance.
Interpreting Median and Range in the Water System Record
Median Value Indicates Typical Detected Level
The median chromium-6 measurement of 1.2 µg/L represents the middle point of detected values during UCMR3 sampling for Wailuku’s system, providing a rough expectation of concentration in the public supply.
Highest Detected Levels Show Variation
The highest measurement was 2.9 µg/L, demonstrating that concentrations can vary but remain below the total chromium MCL of 100 µg/L. These figures serve as reference points rather than specific estimates for any household.
Choosing the Right Treatment Technology Based on Household Demand
After measuring your household’s chromium-6 concentration, the Pentair Chromium-6 Filter offers a direct-purchase option to address the demand your water presents. This ready-to-configure equipment provides a technical approach for the removal of hexavalent chromium, delivering water quality tailored to your test results and usage.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-02-20. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Wailuku (HI0000212), HI: 174 results across 2 listed contaminants, 174 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L