How Gasoline Releases Differ from Dry-Cleaning Releases in Groundwater Impact
Gasoline-derived VOCs tend to include chloromethane detected in the Shoreline R. system
Gasoline spills or leaks commonly introduce solvent compounds like chloromethane, a volatile organic compound detected at a median 0.38 micrograms per liter (µg/L or ppb) in one measurement in the CT Water Co. Shoreline River system. This compound is a simple volatile organic solvent that can evaporate quickly but may be measured in surface water sources.
Dry-cleaning solvents like 1,1-dichloroethane were not detected above reporting levels here
Solvents typically associated with dry-cleaning activities, such as 1,1-dichloroethane, showed no detections above the reporting level of 0.03 µg/L in data from 2013-2015. This indicates these dry-cleaning related VOCs are not measurable in the public water system of this region at levels above minimal detection thresholds.
Additional Questions Commercial or Industrial Operators Need to Ask
Consider broader compound ranges beyond residential VOCs
Industrial users often face a wider range of solvent compounds, including halons and HCFCs not commonly found in household water. In the Shoreline River system, halon 1011 and HCFC-22 were not detected above their respective reporting levels.
Assess process-specific exposure and volume demands
Commercial operations must evaluate specific usage rates and potential discharges that affect VOC concentrations, which differ significantly from residential water use patterns and consumer exposure.
Information Households Should Record Before Seeking Treatment Advice
Determine your water source type and system
Confirm whether your home is served by a public surface water system like CT Water Co. Shoreline River, or a private well, as government data apply only to the public system at large.
Obtain specific water test results for your household
Only testing your own tap or well water can establish your personal VOC concentrations. Regional detections do not predict individual home conditions.
Note any odors, tastes, or staining that may indicate chemical presence
While VOCs are generally odorless and tasteless at low levels, noticeable changes can prompt more detailed analysis.
Sampling Scale Behind the VOC Data
Data based on 20 samples from 2013 to 2015 for the Shoreline River system
The EPA's Unregulated Contaminant Monitoring Rule (UCMR3) results come from twenty sampling events covering this public water system serving over 33,000 people in New Haven County and surrounding towns.
Single detections indicate presence, not concentration averages or trends
The solitary detection of chloromethane at 0.38 µg/L does not establish a trend or typical concentration but shows the compound can appear at trace levels.
No VOC compound listed was found above federal maximum contaminant levels
Federal MCLs do not apply to many VOCs monitored under UCMR3, but none of the compounds detected surpassed any regulatory health standard, and no health-based violations are recorded.
Implications for Large, Secondary, or Seasonal Residences
Increased water usage may influence treatment capacity needs
Homes with higher water demand might require treatment equipment with larger filtration or media capacity to maintain effectiveness against VOCs over time.
Seasonal homes should test water quality upon return
Water chemistry can change from stagnation or varying source conditions during vacancy. VOC presence may differ with seasonal shifts.
Multiple properties may warrant separate water quality assessments
Even within the same public system, local plumbing and source variations necessitate individual water testing to verify treatment requirements per property.
Summary
Government sampling of surface water supplying New Haven County and nearby towns shows isolated detections of some volatile organic compounds like chloromethane at very low concentrations, with no health-based violations recorded. Deciding on a VOC treatment class for your household depends on testing your specific water source and usage patterns. The Pentair VOCs & Industrial Chemicals Filter, available for direct purchase and ready to configure, is designed to address a broad spectrum of these solvent compounds when needed.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-11-18. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for CT Water Co. - Shoreline R., Guilford S. (CT0608011), CT: 140 results across 7 listed contaminants, 1 detections above the reporting level; no federal MCL for these UCMR-listed VOCs