VOCs in Cheshire: What Keene Water Data Reveals About Solvent Compounds in Your Household Water
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Why Are VOCs a Concern for Keene Households?
Many residents in Keene, Cheshire County, NH, wonder how volatile organic compounds (VOCs) might impact their household water quality and what the measured data means. VOCs, including solvent compounds like 1,1-dichloroethane or MTBE, can originate from industrial and urban sources. Knowing the severity of VOC presence at your home requires specific testing beyond regional data, but understanding the public water system’s surveillance can guide your next steps.
How Seasonal Water-Table Changes Move a Solvent Plume Relative to a Well Screen
In Keene’s surface water system area, seasonal shifts in precipitation and water-table levels can influence how VOC solvent plumes move underground. During wetter months, the water table rises, potentially carrying solvent compounds closer to a well screen. Conversely, lower water tables in drier seasons can cause plumes to drop deeper. This vertical movement affects whether VOCs are more likely drawn into well intakes or remain below the screened zone.
How a Gasoline Release Differs from a Dry-Cleaning Release in What It Leaves in Groundwater
Different VOC sources leave distinct chemical signatures in groundwater. A gasoline release typically includes compounds like benzene or MTBE, known for their volatility and potential persistence. Dry-cleaning releases generally involve chlorinated solvents such as 1,1-dichloroethane. In Keene's water record, MTBE was repeatedly tested with no detection above reporting levels, illustrating the absence or minimal presence of typical gasoline-related VOCs. Understanding the source helps in recognizing the types of compounds to monitor.
What a Laboratory's Method Detection Limit Means When a Compound Is 'Not Detected'
When a VOC compound is listed as 'not detected' in laboratory results, it means the concentration was below the test’s method detection limit—the smallest quantity reliably measured. For example, the Keene Water Department reported no detections above 0.03 micrograms per liter for 1,1-dichloroethane during monitoring. This does not guarantee zero presence but indicates any VOC presence is lower than the test can confirm with certainty.
How the Constituent Enters Groundwater or the Distribution System in This Region
In Keene, VOCs can enter the water system primarily through surface water infiltration or groundwater contamination related to industrial activity, urban runoff, or historical land use. Because the water system relies on surface water sources, VOC contaminants detected or monitored in the system reflect what is found in these waters, filtered and treated before distribution. However, VOCs can also infiltrate at various points along the water delivery path.
How Sample Depth, Well Depth or Source Type Changes What a Reader Should Expect
The Keene water system uses surface water as its source rather than deep wells. This difference matters because VOC concentrations can vary widely with source type and depth. Surface water may be more directly influenced by recent surface contamination, whereas deeper wells may have different VOC profiles or none detectable. If you have a private well, your water’s VOC levels could differ significantly from the public system data.
What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
The EPA’s monitoring data indicates whether VOC compounds were 'detected' above the reporting level in the water system. None were detected above these levels for Keene’s system, which means measurements were below the threshold of reliable detection or not found at all. Median values represent the middle concentration value among results, and range indicates the lowest to highest measurements recorded. For Keene’s system, the absence of detection means these statistical measures are minimal or zero within monitored samples.
Summary
Regional VOC data from the Keene Water Department shows no detections above reporting levels for several monitored solvent compounds. Seasonal water-table changes and source type influence VOC movement and concentrations in local water, but individual household conditions require private testing to confirm. For those seeking to address or reduce VOCs in their water, the Fleck VOCs & Industrial Chemicals Filter ships ready to configure as an effective treatment option for removing such volatile organics from residential water supplies.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-03-09. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Keene Water Department (NH1241010), NH: 60 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level