Step 1: Understand Seasonal Water-Table Changes and Solvent Plume Movement Near Your Well Screen
Seasonal changes in the local water table level can shift how volatile organic compounds (VOCs), also called solvent compounds, move underground near your water source. For instance, variations in rainfall and groundwater recharge can cause a plume of compounds like chloromethane or 1,1-dichloroethane to rise or fall relative to the depth of a well’s intake. This movement may lead to varying concentrations in water at different times of year, even if the overall regional presence is stable. Recognizing this dynamic is important because treatment needs may change depending on when water is drawn.
Step 2: Know Why Granular Activated Carbon (GAC) Beds Are Sized for Contact Time Rather Than Flow Alone
Water treatment systems targeting VOCs rely heavily on granular activated carbon to adsorb solvent compounds. The key to effective removal is not just how fast water moves through the system but how long it stays in contact with the carbon. Contact time allows the activated carbon to capture volatile organics before they pass into your household plumbing. Simply increasing flow rate without adequate contact time reduces treatment efficiency, making properly sized GAC beds essential for managing VOCs such as chloromethane detected at up to 0.32 micrograms per liter (parts per billion) in Aguadilla's public water system.
Step 3: Judge Treatment Capacity Against Your Household’s Daily Water Use
When selecting a VOC water treatment system, consider your household’s average daily water demand. The system’s capacity must match or exceed this demand with sufficient contact time to remove volatile organics effectively. For example, a system designed for a larger family’s water use will have a bigger carbon bed and flow rates optimized to keep removal rates high. Understanding your daily consumption helps ensure your chosen system consistently delivers treated water without compromising on VOC reduction.
Step 4: Recognize Differences Between Public-System Monitoring Data and Private Well Testing
The Environmental Protection Agency’s monitoring of the Aguadilla public water system shows minimal measured VOCs: chloromethane was the only volatile organic compound detected above reporting levels, at 0.32 micrograms per liter (µg/L or parts per billion), while others like 1,1-dichloroethane and bromomethane were not detected at levels above reporting limits. This data covers the public water supply as a whole, not any individual household’s water. To determine your home's exact VOC levels, you would need specific water testing performed on your tap or well by a certified laboratory. Public system results provide useful background but do not reveal individual variations caused by plumbing or localized contamination.
Step 5: Differentiate Between Gasoline Releases and Dry-Cleaning Releases in Groundwater VOC Profiles
Sources of VOCs in groundwater can vary by contamination type, affecting which compounds appear and in what concentrations. For example, a gasoline spill typically introduces hydrocarbons such as MTBE, which was monitored but not detected above reporting levels in Aguadilla. Conversely, dry-cleaning solvent releases often involve chlorinated compounds not commonly found in fuel-related plumes. Understanding the source of VOCs helps anticipate which volatile organics might be present and guides the choice of treatment technology to target those specific chemicals.
In summary, evaluating seasonal changes in solvent plume behavior, ensuring sufficient carbon contact time, sizing treatment to your water use, understanding the limits of public system data versus private testing, and identifying contamination sources all play key roles in selecting an effective VOC water treatment approach. The Pentair VOCs & Industrial Chemicals Filter ships ready to configure and offers a granular activated carbon method designed to address these solvent compounds found in the Aguadilla water system.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2016-12-11. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Aguadilla (PR0003293), PR: 272 results across 7 listed contaminants, 1 detections above the reporting level; no federal MCL for these UCMR-listed VOCs