Understanding Source Variability in VOC Contamination

Gasoline versus Dry-Cleaning Releases in Groundwater

Gasoline spills typically introduce a mix of hydrocarbons, some of which are volatile organic compounds like MTBE, whereas dry-cleaning solvent releases contribute chlorinated solvents such as 1,1-dichloroethane. According to EPA UCMR3 data for the Rehoboth District public water system, none of the gasoline-related VOCs such as MTBE were detected above reporting levels, and chlorinated solvents like 1,1-dichloroethane were also below detection. This difference highlights the importance of knowing the contamination source when choosing treatment.

Seasonal Water-Table Fluctuations and Their Effects on VOC Distribution

Movement of Solvent Plumes Relative to Well Screens

Seasonal variations in groundwater levels can shift volatile organic compound plumes vertically and horizontally. These shifts may affect well intake points differently over time. For Rehoboth Beach, where groundwater is the source, variations influence whether VOC concentrations near well screens rise or fall seasonally, complicating reliance on single tests and making regular monitoring important for accurate treatment sizing.

Household Usage Patterns Influencing VOC Treatment Needs

Differences Between Large Households, Seasonal, and Second Homes

Water demand changes among household types impact the volume of water treated and contact time with filtration media. A large full-time household requires continuous treatment for VOCs, whereas a seasonal or second home may face stagnation-related VOC concentration changes during unoccupied periods. Treatment equipment should accommodate these usage patterns to maintain VOC reduction effectiveness.

Impact of Plumbing Materials and Age Separate From Source Water

Potential VOC Interaction With Older Plumbing

Although VOCs primarily originate from source water, older plumbing materials can influence water chemistry and potentially adsorb or release compounds. This effect can alter effective VOC concentrations at the tap. Newer pipes may have less such interaction. Selecting treatment technology should consider the age and material of household plumbing to ensure consistent VOC control.

Interpreting the Median and Range of VOC Measurements From EPA Records

What the Reported Data Means for a Homeowner

The Rehoboth District’s UCMR3 records show for HCFC-22, a volatile organic compound, two detections above 0.08 micrograms per liter (µg/L) with a median detection of 0.31 µg/L; no other targeted VOCs showed detection above reporting levels. These numbers represent typical system-level concentrations over 2013 to 2015 and should not be assumed to reflect any single home's water. Homeowners need testing of their own supply for precise data.

Sample Size and Its Implications on the Reliability of VOC Data

Understanding the Scope of EPA Monitoring in the Region

The monitoring covered 12 results for most VOCs, drawn from the public water system serving over 81,000 people via 27,139 connections in Rehoboth Beach. This sample size supports broad conclusions about system water quality but leaves individual household variations uncharacterized. Limited samples mean homeowners should consider private testing to tailor treatment methods.

Closing

After assessing your household’s VOC demand based on private water tests, the C-Series VOCs & Industrial Chemicals Filter ships ready to configure for efficient reduction of volatile organic compounds and solvent contaminants commonly found in the Rehoboth District water system. This technology uses appropriate contact time and filtration media optimized for residential water treatment needs.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-10-26. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Rehoboth District (DE0000991), DE: 80 results across 7 listed contaminants, 2 detections above the reporting level; no federal MCL for these UCMR-listed VOCs