VOCs in Sussex Water: Understanding Rehoboth Beach's Volatile Organic Compounds Record

Why a Granular Activated Carbon Bed Is Sized for Contact Time Rather Than Flow Alone

Contact Time Matters More Than Flow Rate

Effective reduction of VOCs and solvent compounds relies largely on how long water stays in contact with the granular activated carbon bed. Quick flow can allow VOCs to pass through untreated, whereas proper contact time enables adsorption and removal.

Balancing Household Demand and Treatment Capacity

The system must accommodate typical residential peak water use while maintaining sufficient contact time. This balance ensures removal efficiency for volatile organics detected in the regional groundwater supply.

Design Focused on VOCs Removal

Unlike some water treatment approaches that prioritize flow, treating VOCs emphasizes contact time with the media to address compounds like HCFC-22, detected in limited samples from Rehoboth's water system.

What Distinguishes This Problem From the Two Problems Most Often Confused With It

VOC Detection Is Not a Health Violation

Measurements in the Rehoboth District public water system found occasional detections of HCFC-22 up to 0.38 micrograms per liter (µg/L) or parts per billion (ppb). These detections are not violations, health-based or otherwise, as no federal maximum contaminant levels (MCLs) exist for these compounds.

Difference From Aesthetic Issues

Unlike taste or staining concerns often linked with chloride or total dissolved solids, VOCs relate to volatile organic chemicals present in source groundwater that may evaporate or off-gas during household water use.

Distinction From Microbial or Particulate Contamination

VOC issues arise from chemical compounds, not bacteria, sediment, or mineral particles. This distinction is critical for determining appropriate testing and treatment strategies.

The Household or Facility Symptoms That Do and Do Not Point to This Problem

Symptoms That May Indicate VOCs

• Unusual chemical or solvent-like odors during showering or dishwashing
• Noticeable chemical tastes in drinking water
• Inhalation exposure symptoms when water vaporizes

Symptoms Not Typically Linked to VOCs

• Water hardness effects such as scale buildup
• Iron or manganese staining
• Biological odors or coloration

Which Fixtures, Appliances or Processes Are Affected First and Why

Showers and Faucets Producing Aerosols

Volatile organics can volatilize during showering and faucet use, leading to inhalation exposure. These fixtures are the first point for VOC-related concerns.

Dishwashers and Hot Water Heaters

Heating water can increase volatilization of solvent compounds, potentially releasing VOCs into indoor air or affecting appliance function over time.

Ice Makers and Drinking Water Faucets

VOCs are less volatile at cold temperatures but may still alter water taste or odor from drinking sources.

How to Compare This Area's Record With a Neighboring County's Without Overreading It

Use Reported Detection Frequencies and Concentrations

Compare the presence and concentrations of VOCs such as HCFC-22, chloromethane, and 1,1-dichloroethane from EPA monitoring data rather than assuming uniform water quality across counties.

Consider Different Water Sources and Population Served

Rehoboth District serves over 81,000 people via groundwater; neighboring counties may have different sources or system sizes influencing VOC occurrence.

Recognize That Detection Is Not a Safety Finding

Presence of VOCs above reporting levels is a measurement fact, not a health violation or safety concern by itself, so interpret data accordingly.

The Single Test to Order and What Results Would Settle the Question

To determine household VOC levels definitively, order a laboratory analysis targeting volatile organic compounds using methods aligned with EPA guidelines. Results reporting concentrations in micrograms per liter (ppb) will clarify the presence and amount of VOCs in your specific water supply, guiding the need for treatment.

If VOCs are detected at levels consistent with the regional data, the Autotrol VOCs & Industrial Chemicals Filter offers a documented approach for reducing volatile organics in residential water.

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