Government Sampling Data for VOCs in Pierre’s Water System
The Pierre public water system in Hughes County, South Dakota, which serves over 14,000 people across 5,141 connections, draws water from surface sources. According to federal EPA monitoring conducted from 2013 to 2015 under the Unregulated Contaminant Monitoring Rule (UCMR3), no health-based violations were recorded for volatile organic compounds (VOCs) in this system. VOCs such as 1,1-dichloroethane, chloromethane, and others were not detected above their reporting levels, while two detections of MTBE were reported at concentrations up to 16.8 micrograms per liter (µg/L), or parts per billion (ppb). It is important to note these detections are measurements, not indications of safety concerns or regulatory breaches.
Why Volatility Matters: Exposure Routes Beyond Drinking
VOCs, or volatile organic compounds, include solvent compounds that can easily evaporate from water into air. This volatility means exposure during everyday activities such as showering and dishwashing can allow these compounds to enter your home’s indoor air. Inhalation of volatile organics released from water may pose different considerations than ingestion. Thus, controlling VOCs in household water is about more than just drinking water quality; it also concerns air quality indoors.
How Seasonal Water-Table Changes Affect Solvent Plume Positioning
In regions like Hughes County, seasonal fluctuations in the water table can cause a solvent plume—an underground zone where VOCs concentrate—to move relative to the screened depth of a well. Higher water tables in wet seasons can raise the plume closer to the intake screen, potentially increasing VOC concentrations in extracted water. Conversely, lower water tables in dry periods may reduce this concentration. These movements mean VOC levels in water may vary seasonally, complicating assessment without ongoing monitoring.
Distinguishing Public Water Records from Individual Well Testing
The EPA’s public water system record reflects broad monitoring results for the community source, not measurements from any individual residential well or household plumbing. This distinction means the record provides evidence about the system’s overall water quality but cannot specify what is present in your home's water. If you rely on a private well or have unique plumbing concerns, a specific water test from a certified laboratory is necessary to establish your water’s VOC content.
Interpreting Terms: 'Detected', 'Median', and 'Range' in VOC Sampling
'Detected' refers to instances where the testing instrument found a VOC at or above its reporting level, not a violation or unsafe condition. The 'median' is the middle value of detected concentrations, showing a typical measurement among positives. The 'range' reflects the spread from the lowest to highest detected values. For example, MTBE detections in Pierre ranged from just above 5.0 µg/L to 16.8 µg/L, with a median around 11.3 µg/L. These figures help describe what was measured but do not imply any hazard on their own.
Understanding Measured VOC Levels Against Federal Standards
While these VOCs were monitored, none have established federal maximum contaminant levels (MCLs) under UCMR3 data, and the Pierre system reported zero health-based violations. VOC detection above reporting levels does not mean the water exceeds any enforceable safety standard. This sampling data documents presence and concentration but does not define a health risk or regulatory breach for the system.
Reading Certified Laboratory VOC Test Results for Your Water
A certified lab test reports VOC concentrations in micrograms per liter (µg/L), equivalent to parts per billion (ppb). Results specify which volatile compounds were found and at what levels. Such a test is the only way to determine whether VOC concentrations in your specific water supply are above your comfort or treatment thresholds. It also helps guide selection of appropriate treatment solutions tailored to your water’s VOC profile.
Recommended Next Step: Confirm Your Water’s VOC Levels
Sourcing your water's VOC levels from a certified laboratory test is the key step. This test settles whether your household's VOC content requires additional treatment beyond your current setup, which you described as no longer keeping pace. The Fleck VOCs & Industrial Chemicals Filter ships ready to configure and offers a documented filtration method designed to address VOCs and solvent compounds effectively. Knowledge from your test results guides confident action in managing volatile organics in your Pierre home's water supply.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-09-10. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Pierre (SD4600242), SD: 165 results across 7 listed contaminants, 2 detections above the reporting level; no federal MCL for these UCMR-listed VOCs
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