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

Water-table fluctuations shift VOC plumes

Seasonal rises and falls in groundwater levels can move volatile organic compound (VOC) plumes closer to or farther from the well screen that draws your household water. In Fayetteville’s Cliffdale West system, VOCs like chloromethane and HCFC-22 have been detected sporadically over several years. Even small water-table changes can alter VOC concentrations reached by the well.

Groundwater movement affects compound transport

The geoposition and flow of groundwater carry solvent compounds through subsurface layers. These compounds might be traced back to industrial or historical solvent releases rather than current contamination points. Seasonal shifts influence where volatile organics concentrate around water sources.

Household Symptoms That Do and Do Not Point to This Problem

Symptoms that may suggest VOC presence

• Unusual or chemical-like tastes or odors in household water
• Intermittent water discoloration that correlates with groundwater level changes

Symptoms less likely caused by VOCs

• Cloudiness or sediment, which often relates to particulate matter or microbial growth
• Hard water scale buildup, unrelated to VOCs

Which Fixtures, Appliances or Processes Are Affected First and Why

First affected fixtures

Water-using appliances like ice makers, humidifiers, or cold water taps may show early signs of VOC presence due to lower water temperatures preserving volatile compounds. Showerheads and faucets can also reflect VOC levels but might be less noticeable without testing.

Processes sensitive to VOCs

Household processes involving water consumption—cooking, drinking, and bathing—are most impacted by volatile organics if present. HVAC or air humidification systems using water may redistribute volatile compounds into indoor air.

What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page

Detected means measured above a threshold

In EPA UCMR3 monitoring for the Cliffdale West system, "detected" indicates a volatile organic compound was measured above the method’s reporting level, not that it is unsafe or violating standards. For example, chloromethane was detected once at 0.29 micrograms per liter (0.29 parts per billion).

Median shows the middle value of detected measurements

The median of detections represents the midpoint concentration among detected samples, providing insight into typical levels when the compound is present.

Range reflects minimum to maximum detected concentrations

The range describes the spread of measurements, illustrating variability across samples. Some VOCs showed zero detections; others like HCFC-22 had a highest detected value of 0.087 micrograms per liter (0.087 ppb).

What a Certified Laboratory Test for This Constituent Reports and How to Read It

Test results give concentrations specific to your water

Only a certified laboratory test of your home’s water supplies can reveal actual VOC levels present. Testing reports list detected compounds with concentrations in micrograms per liter (µg/L) or parts per billion (ppb).

Interpretation requires knowledge of local standards

Since federal regulations set no maximum contaminant levels (MCLs) for many VOCs monitored in the Fayetteville area, detection alone does not signal a violation. Compare results to regional data like the Cliffdale West system monitoring to understand your water’s relative VOC presence.

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

Gasoline-related VOCs

Gasoline leaks typically introduce compounds like benzene, toluene, and MTBE into groundwater. In the Fayetteville system monitoring, no MTBE was detected above reporting levels, indicating no measurable gasoline release impact during sampling.

Dry-cleaning solvent VOCs

Solvents used in dry cleaning, such as perchloroethylene and 1,1-dichloroethane, are volatile organics of a different chemical class. In Cliffdale West water records, no 1,1-dichloroethane was detected above the reporting level, suggesting minimal dry-cleaning solvent impact during monitoring.

Closing Summary

The water quality record cited here summarizes public water system monitoring for over 15,000 residents and 6,000 connections in Fayetteville’s Cumberland County area. It reflects groundwater source conditions measured from 2013 to 2015 but does not represent individual household water. The EPA’s database at epa.gov provides detailed data on these unregulated contaminants for public review.

For households where existing equipment no longer keeps up with VOC levels indicated by regional data, the Autotrol VOCs & Industrial Chemicals Filter ships ready to configure and can provide targeted treatment to address volatile organic compounds effectively.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2014-09-29. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Cliffdale West (NC0326332), NC: 390 results across 7 listed contaminants, 2 detections above the reporting level; no federal MCL for these UCMR-listed VOCs