Autotrol Chromium-6 Filter

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At your tap in Kent County cities like Coventry, Cranston, or Warwick, occasional testing may detect chromium-6, a form of chromium known as hexavalent chromium or chromium(VI). It is part of what can be measured in the water that comes from the public surface water supply managed by the Kent County Water Authority.

Why California Set a 10 µg/L Standard for Chromium-6 and What It Means Here

California's hexavalent chromium limit

• California established a public health goal of 10 micrograms per liter (µg/L), or parts per billion (ppb), for chromium-6 in drinking water as a precautionary measure.
• This standard reflects concerns about long-term exposure, but it is not a federal enforceable limit.
• In Kent County, Rhode Island, public water system records show levels well below any federal maximum contaminant level (MCL) for total chromium, and there is no federal MCL specifically for chromium-6.
• These differences mean residents here are not directly subject to California’s chromium-6 limit but may consider it when evaluating treatment needs.

Trivalent vs. Hexavalent Chromium: Why Total Chromium Figures Aren’t the Whole Story

Total chromium includes multiple chromium forms

• Water tests typically report total chromium, which sums all chromium chemical forms, including chromium(III) and chromium(VI).
• Chromium(III), or trivalent chromium, is an essential nutrient in small amounts and less concerning here.
• Hexavalent chromium (chromium-6) has different chemical properties and health considerations than trivalent chromium.
• Because total chromium tests don’t differentiate, separate chromium-6 testing is needed to identify its presence.

Changing Chemistry: How Chromium's Oxidation State May Shift from Source to Tap

Oxidation state influences chromium form

• Chromium in source water can exist in both trivalent and hexavalent forms depending on natural and treatment-related chemical reactions.
• Within the water system’s distribution network and household plumbing, changes in factors like pH and disinfectants can alter chromium’s oxidation state.
• This means chromium-6 measured at the treatment facility may vary in concentration or form once it reaches the household tap.
• Hence, sampling at the tap is necessary to assess chromium-6 exposure accurately for an individual home.

Maintenance Rhythm of the Autotrol Chromium-6 Filter in Plain Terms

Regular maintenance keeps filter performance steady

• The Autotrol Chromium-6 Filter uses specialized media designed to target chromium(VI) in water.
• The equipment ships ready to configure with household plumbing setups without requiring specialized tools.
• Its media is refreshed on a schedule based on water usage and measured water quality parameters, typically involving periodic backflush cycles and media regeneration to maintain chromium-6 capture efficiency.
• Following the manufacturer’s guidance on media replacement frequency ensures consistent water quality over time.

Understanding Detected, Median, and Range in the Sampling Record

What government monitoring found for chromium-6 in Kent County

• Between May 2014 and February 2015, the Kent County Water Authority’s public water system monitoring recorded 20 chromium-6 samples.
• Of these, 5 samples showed chromium-6 above the reporting level of 0.03 µg/L.
• The highest measured chromium-6 level was 0.11 µg/L, with a median of 0.047 µg/L among detections.
• Total chromium was detected in 8 samples, with a highest concentration of 0.8 µg/L and a median detection of 0.425 µg/L.
• None of these results indicate any federal violation or exceedance of a maximum contaminant level.

What to Note Before Seeking Treatment Advice

Information to have ready

• Obtain a current water quality report or testing results for your specific household well or tap water, focusing on chromium-6 if available.
• Record your water source type and any existing treatment equipment in use.
• Note any water quality concerns you observe, such as taste, color, or staining, though these are more related to other constituents.
• Be prepared to discuss patterns of water use to determine an appropriate maintenance schedule for treatment equipment.

Choosing the right approach to manage chromium-6 in your household water in Kent County involves understanding local water system data, recognizing the difference between chromium forms, and considering the chemical changes water undergoes from source to tap. The Autotrol Chromium-6 Filter provides a documented solution that addresses chromium(VI) specifically, with straightforward maintenance rhythms suited to residential settings.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-02-11. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Kent County Water Authority (RI1559511), RI: 40 results across 2 listed contaminants, 13 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L