Households Facing VOCs in Cass County: What Fargo’s Water Data Reveals

This week, Fargo-area households must decide how best to address volatile organic compounds (VOCs) in their water supply amid existing equipment strains.

How Seasonal Water-Table Changes Move a Solvent Plume Relative to a Well Screen

A common belief is that contaminants stay fixed underground, but seasonal shifts in the water table can cause a VOC solvent plume to rise or fall relative to a well screen. In Fargo’s surface water system, such movement may affect concentrations drawn into water supplies. Because the groundwater flow and water levels vary with the seasons, VOC levels can fluctuate accordingly, impacting treatment needs and effectiveness. Recognizing this variability is essential when assessing water quality trends and evaluating treatment performance.

How a Gasoline Release Differs from a Dry-Cleaning Release in What It Leaves in Groundwater

It’s often assumed all VOC contamination sources act the same. However, gasoline spills tend to introduce a complex mix of hydrocarbons that degrade over time, while dry-cleaning solvents like perchloroethylene persist longer and penetrate deeper. For Fargo’s surface water-sourced system, no detections of several VOCs common to these releases, such as 1,1-dichloroethane or chloromethane, were found above reporting levels during federal monitoring from 2013 to 2015. Understanding the distinct source profiles assists households in determining potential risks and appropriate responses.

How the Constituent Enters Groundwater or the Distribution System in This Region

Many think VOC contamination primarily occurs from groundwater infiltration, but in Fargo’s case, the public water system draws from surface water sources. VOCs can enter the system through runoff or atmospheric deposition rather than solely from underground plumes. The EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) results for Fargo’s system showed all tested VOCs, including bromomethane and MTBE, below their respective reporting levels. While this does not guarantee absence in all home water, it reflects the system’s wide-area conditions and typical constituent presence patterns.

How Public-System Records Differ from Private-Well Testing in What They Establish

A frequent misconception is that public water system data directly apply to every individual household. Public-system tests measure water quality at source or entry points and represent system-wide averages or maximums, not specific home tap levels. Private wells vary widely based on local geology, nearby contamination sources, and well construction. For a Fargo household, only direct water testing can confirm personal VOC levels. Public records, like those from the City of Fargo system, are useful for general awareness but cannot substitute for specific household analysis.

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

It’s often believed that any unusual taste, smell, or water discoloration indicates VOC contamination. However, VOCs typically do not produce strong sensory clues at the low levels often found in municipal supplies. Instead, symptoms such as persistent chemical taste or odor, staining, or health effects require thorough water testing to attribute confidently to VOCs. Households whose equipment struggles to keep up with VOC removal should consider advanced treatment options designed for volatile organics to support consistent water quality.

What should not be concluded from the area data is that all Fargo households face VOC concentrations above health-based standards or that the absence of detected VOCs in system tests guarantees safety at every tap. The EPA record shows no VOC detection above reporting limits for the city’s surface water system during UCMR3 monitoring, but individual water quality depends on local factors. Where existing equipment cannot fully manage VOCs, the Pentair VOCs & Industrial Chemicals Filter ships ready to configure as a targeted solution to reduce volatile organic compounds and related industrial chemicals, supporting household water treatment beyond standard setups.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2013-12-02. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for City of Fargo (ND0900336), ND: 28 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level