The EPA public water system record for the CTWC Unionville System, serving Avon, Bristol, Farmington, Plainville, and nearby Hartford County areas, indicates two health-based violations recorded historically, but the system otherwise maintains treatment processes for bacteria and coliform control.
Myth: Larger or seasonal households do not impact bacterial levels in water.
In reality, larger households or seasonal residences can experience more rapid bacterial growth within internal plumbing and equipment, as water stagnation or increased demand alters microbial dynamics. The EPA record covers a broad service area and does not identify individual household conditions, but it suggests that internal system factors beyond municipal treatment can influence bacteria presence.
Myth: The water source type does not affect bacterial expectations.
The CTWC Unionville System draws from surface water, which generally requires rigorous treatment to control microbial contaminants. Depth of wells is not applicable here since this is a surface water system. For private wells, deeper or shallower wells might have different bacterial risks, but public records reflect the treated system supplied to residents.
Myth: Terms like 'detected', 'median', and 'range' indicate unsafe levels or uniform conditions.
Detected means bacteria or coliform were measured in some samples; median and range describe the distribution of measurements across many samples. These terms do not imply the water is unsafe or exceeds health-based standards. The EPA record shows treatment processes in place and only two health-based violations across the system's history, not a current widespread health concern.
Myth: All test results are equally reliable regardless of sample size or sources.
The data are drawn from many samples across over 6,300 service connections and 14,693 people. A small number of samples or limited well tests would be less revealing. Here, the system's record is based on a broad and ongoing sampling effort, but households should test their specific water to know their exact conditions.
Myth: Untreated bacterial issues will always cause immediate health emergencies.
Untreated bacterial concerns can lead to water quality issues interfering with plumbing and appliances over time or cause taste and odor problems. However, risks increase gradually and depend on specific bacteria types and exposure, not solely detection. The presence of treatment processes in the system record reflects ongoing management of this risk.
Understanding what government water quality records for Hartford County reveal helps households recognize the difference between area-wide system data and individual water conditions. Testing personal water, especially for bacterial presence, is essential to confirm needs.
For households where existing equipment struggles to keep up with bacterial challenges, the Pentair Bacteria & Coliform (Well) Filter ships ready to configure as a reliable solution to reduce bacteria and coliform presence, supporting water quality and household safety.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for CTWC - UNIONVILLE SYSTEM (CT0520011), surface water supply, serving 14693 people: 2 health-based violations of 3 total; lead 90th percentile 0.0024 mg/L
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