When you turn your tap in Avon or nearby Hartford County towns, you may notice nothing unusual. However, government monitoring of the public water system serving Avon, Farmington, and Simsbury reveals detectable chromium-6 (hexavalent chromium) in groundwater sources supplying your water. These findings are about the supply system, not individual home taps.
How Oxidation State Changes Between Well, Distribution Main, and the Tap
Groundwater source supplies hexavalent chromium (Cr(VI)) detected
The Avon Water Company’s groundwater source showed chromium-6 in all samples monitored between 2013 and 2015, with values from 0.03 to 1.0 micrograms per liter (µg/L or parts per billion, ppb). Chromium-6 presence reflects the oxidation state supplied at the well, with no health-based violations recorded.
Distribution lines maintain chromium-6 levels close to source measurements
Water delivered through the distribution mains to households retains similar chromium-6 levels due to consistent groundwater conditions and minimal chemical transformations under typical system operation.
Household taps may show slight changes but largely reflect distributed chromium-6
Factors such as residence plumbing and stagnation can influence chromium oxidation state, but generally, chromium-6 detected at the tap corresponds to system source levels, assuming no point-of-entry treatment or unusual plumbing chemistry.
Trivalent Versus Hexavalent Chromium: Why Total Chromium Results Cannot Answer the Question
Total chromium MCL of 100 µg/L does not specify chromium-6 portion
The Avon system data shows total chromium detected far below the federal maximum contaminant level (MCL) of 100 µg/L, with no safety violations. However, total chromium measurements alone cannot determine how much chromium is chromium-6 versus less oxidized chromium(III).
Chromium-6 is the specific chromium oxidation state under monitoring
Chromium-6 is monitored separately because it behaves differently chemically and biologically than chromium(III), but these measurements are not regulatory limits. Differentiating between chromium forms requires specialized testing beyond total chromium results.
How to Judge Treatment Capacity Against Your Household’s Daily Demand
Calculate your water use in gallons or liters per day first
Understanding your household water consumption is key to sizing any treatment addressing chromium-6. Typical indoor water use per person ranges around 80 to 100 gallons daily, but actual values depend on household size and habits.
Match treatment capacity to sustained flow and total volume needed
This ensures sufficient chromium-6 filtering capability without premature exhaustion. Consider peak usage times and total daily volume for best performance.
The Household or Facility Symptoms That Do and Do Not Point to This Problem
Chromium-6 presence does not cause noticeable taste, odor, or color changes
Unlike some water issues, hexavalent chromium levels found in Avon’s water system are unlikely to produce sensory water quality symptoms.
Staining or corrosion effects are generally unrelated to chromium-6 levels
Chromium-6 concentrations in this range are not known to cause staining or pipe corrosion signs. Such symptoms point to other water constituents or plumbing factors.
Why Aesthetic Secondary Standards Differ from Health-Based Limits, Applied to Chromium-6
No federal maximum contaminant level (MCL) exists specifically for chromium-6
While total chromium has an enforceable MCL, chromium-6 is regulated through monitoring, not a health-based limit. This means detected levels do not imply a legal violation or unsafe water but indicate where further attention may be appropriate.
Secondary standards relate to taste, color, or staining, not chromium-6 health concerns
Chromium-6’s regulatory context focuses on accurate measurement and understanding, separate from typical aesthetic criteria.
The Role of Plumbing Material and Age, Separate from Source Water
Household plumbing materials generally do not contribute chromium-6
Chromium-6 measurements trace back to groundwater sources rather than household pipes or fixtures, which typically contain no chromium compounds that convert to hexavalent chromium.
Older plumbing may affect overall water quality but not chromium-6 levels
Other metals or contaminants may leach from aging pipes, but this is distinct from chromium-6 presence traced by system monitoring.
For households in Avon and neighboring Hartford County towns looking to address chromium-6 as indicated by public water system monitoring, the Fleck Chromium-6 Filter ships ready to configure and is designed to align treatment capacity with your daily water use. Testing your home's water for specific chromium species will help determine your exact needs before adding this focused treatment.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-02-12. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Avon Water Co. (CT0040011), CT: 64 results across 2 listed contaminants, 63 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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