The water delivered by the Dover Water Department in Kent County, Delaware, draws from groundwater sources that supply nearly 40,000 residents. This public water system has been studied under federal programs to monitor the presence of volatile organic compounds (VOCs), also known as volatile organics or solvent compounds, which are chemicals that can evaporate easily and may originate from various industrial or natural sources.
What does it mean when a laboratory's method detection limit reports a compound as 'not detected'?
Laboratories use specific thresholds called method detection limits (MDLs) to determine whether a volatile compound is measurable in water samples. If a VOC concentration is below this limit, the lab reports it as 'not detected.' For example, in Dover's public water system record, none of the 1,1-dichloroethane or chloromethane samples exceeded their MDLs of 0.03 and 0.2 micrograms per liter (µg/L), respectively. This does not imply the compounds are completely absent, only that their levels were too low to be quantified confidently by the testing method.
How do seasonal water-table variations affect the position of a solvent plume relative to a well screen?
Seasonal fluctuations in groundwater levels can cause solvent plumes—concentrations of volatile organic compounds in groundwater—to shift vertically and horizontally. During wet seasons, rising water tables may dilute contaminants or shift them away from well screens, while dry seasons might concentrate solvents closer to extraction points. This dynamic behavior means that VOC levels detected in samples can vary over time even within the same water system.
How does treated water differ at the tap once the Autotrol VOCs & Industrial Chemicals Filter is in use?
The Autotrol VOCs & Industrial Chemicals Filter employs specialized filtration technology designed to reduce volatile organics and industrial chemicals from household water. Once the system ships ready to configure and is connected, the treated water at the tap can exhibit significantly reduced levels of these compounds, improving overall water quality for residential use. The equipment relies on mechanisms such as granular activated carbon to adsorb solvent compounds effectively without using chemicals or altering water chemistry beyond removal of target VOCs.
Which volatile organic compounds appear in Dover’s public water record and which do not, according to EPA UCMR3 monitoring?
Between 2013 and 2015, EPA monitoring for the Dover Water Department measured multiple VOCs at specified reporting levels. Compounds such as 1,1-dichloroethane, chloromethane, bromomethane, and 1,3-butadiene were not detected above their respective detection limits. However, HCFC-22 was detected in 2 of 28 samples, with concentrations up to 0.26 micrograms per liter (µg/L) or parts per billion (ppb), and Halon 1011 was detected once at 0.064 µg/L. No federal Maximum Contaminant Levels (MCLs) apply to these specific UCMR-listed VOCs, so these detections do not indicate health-based violations or unsafe conditions but simply demonstrate the presence of trace amounts in the groundwater source.
Can you provide a worked example of reading the median and range for VOC detections from this record as a homeowner?
Examining HCFC-22 detections, the EPA data shows a median concentration of 0.235 µg/L in the two samples where it was found, with a highest detected value of 0.26 µg/L. This means half of the detected measurements were above 0.235 µg/L and half below, with all detections falling between the reporting level of 0.08 µg/L and the highest value. A homeowner interpreting this data should understand these are small concentrations measured in parts per billion, and that no federal limits exist for these VOCs in the monitored system. A personal water test would be necessary to know the specific VOC levels in their household supply.
How do public water system records like Dover’s differ from private well testing in what they establish about VOC presence?
Public system records aggregate data from multiple sampling points over time to characterize the water supply as a whole, rather than any individual home’s water quality. They provide information on the groundwater source and distribution system but cannot substitute for private well testing or in-home water analysis. VOC levels in a specific household’s water can vary due to plumbing, well depth, and local contamination sources. For households in Dover served by the public system, these EPA records offer a broad view of solvent compound occurrences but do not replace personal water testing to quantify exact VOC levels at a residence.
In summary, the EPA’s monitoring under the Unregulated Contaminant Monitoring Rule presents valuable data on volatile organic compounds found in the Dover, Kent County groundwater system. This information helps residents understand what compounds have been detected historically, their concentration ranges, and which compounds have not been found at significant levels. For detailed information, visit the EPA’s official public water system records for Dover Water Department.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-03-12. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Dover Water Department (DE0000571), DE: 196 results across 7 listed contaminants, 3 detections above the reporting level; no federal MCL for these UCMR-listed VOCs
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