The water supplied to homes in Montgomery County, PA, by Aqua PA's Main System comes from surface water sources and serves over 800,000 people. This municipal supply is monitored regularly for a range of substances, including volatile organic compounds (VOCs), which are a group of carbon-based chemicals that can evaporate into the air and sometimes enter drinking water.
How a Gasoline Release Differs from a Dry-Cleaning Release in What It Leaves in Groundwater
VOCs can originate from different sources such as gasoline spills or dry-cleaning solvents. Gasoline-related contamination often involves compounds like benzene, toluene, or MTBE, which are monitored but were not detected above reporting levels in this water system’s recent monitoring. Dry-cleaning solvents typically include chlorinated VOCs such as 1,1-dichloroethane. In Montgomery County's water system record, 1,1-dichloroethane was detected in some samples but at very low levels—generally under 0.14 micrograms per liter (µg/L), or parts per billion (ppb). These detections do not indicate any violation or health-based limit but illustrate that trace amounts can sometimes be measured. The source and nature of an accidental release influence which VOCs are found and their persistence in groundwater or surface water supplies.
Why a Granular Activated Carbon Bed Is Sized for Contact Time Rather Than Flow Alone
Water treatment for VOCs often uses granular activated carbon (GAC) filters. The effectiveness of GAC depends heavily on how long the water remains in contact with the carbon media, not simply on the flow rate through the system. Sufficient contact time allows the carbon to adsorb volatile organic compounds efficiently, reducing their concentration before water reaches taps. Choosing a treatment system with an adequate contact time relative to household water use is key to optimizing removal of VOCs such as 1,1-dichloroethane.
What a Certified Laboratory Test for This Constituent Reports and How to Read It
Laboratory testing for VOCs reports detected concentrations relative to method detection limits (MDLs) and reporting levels (RLs). A ‘detected’ VOC means the lab measured a concentration above the RL, not that it exceeds any legal or health limit. For example, in Montgomery County’s water system, detections of 1,1-dichloroethane ranged from 0.03 to 0.14 µg/L. No federal maximum contaminant level (MCL) exists for this compound under the Unregulated Contaminant Monitoring Rule (UCMR), so detections simply document presence, not safety concerns. A non-detect result means the concentration is below the lab’s detection threshold, not necessarily zero.
How to Judge Treatment Capacity Against the Household's Daily Demand
When comparing technical approaches to VOC reduction, consider your household’s average and peak daily water usage. A treatment system sized properly will maintain effective VOC contact time even during high demand periods. Oversized systems can waste resources, while undersized ones may not reduce VOCs adequately. Verify the system’s specifications include the volume of treated water per day and the expected contact time to match typical household consumption.
What Questions a Commercial or Industrial Operator Adds That a Household Does Not
Unlike residential users, commercial and industrial facilities may face different regulatory requirements and water volumes. They often require validation of treatment capacity for large fluctuating flows and may test for a broader range of industrial solvents. Residential users primarily need to confirm that their selected system effectively targets the VOCs documented in their supply area and is sized for typical household use.
What Distinguishes This Problem from the Two Problems Most Often Confused with It
VOCs as volatile organics differ from other water quality concerns such as microbial contamination or inorganic minerals. This difference affects treatment choice. For example, VOCs are generally removed by adsorption or air stripping, whereas disinfectants and metals require different methods. Confusing VOC presence with aesthetic issues like odor or taste can lead to inappropriate treatment selections. Testing specifically for VOCs provides the clarity needed.
To determine whether VOC treatment is warranted for your household water, the single recommended test is a certified laboratory analysis for volatile organic compounds, including the specific compounds detected by the Aqua PA system. If VOCs are confirmed at levels of concern to you, choosing a Fleck VOCs & Industrial Chemicals Filter may help reduce those compounds effectively. This system ships ready to configure, providing a direct purchase option tailored for residential control of VOCs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2013-10-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Aqua PA - Main System (PA1460073), PA: 363 results across 7 listed contaminants, 7 detections above the reporting level; no federal MCL for these UCMR-listed VOCs
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