Dealing with VOCs in Silver Bow: Understanding Butte's Water System Records
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If you notice a solvent-like taste or smell in your household tap water in Butte, Silver Bow County, your concerns about volatile organic compounds (VOCs) are understandable. VOCs, also called volatile organics or solvent compounds, include substances like 1,1-dichloroethane and chloromethane, which sometimes appear in water sources due to industrial activities. However, understanding what the public water supply records say helps clarify the actual situation in your area.
What "Not Detected" Means in VOC Testing
When the Butte Silverbow Water Department's water samples show "not detected" for compounds such as 1,1-dichloroethane or bromomethane, this means the concentration was below the laboratory's method detection limit. For example, 1,1-dichloroethane was not detected above 0.03 micrograms per liter (µg/L), equating to 0.03 parts per billion (ppb). It does not mean the compound is completely absent, but that it is present, if at all, at levels too low for that method to measure.
How Seasonal Changes Affect VOC Plumes in Groundwater
The solvents that contribute to VOCs in water sources can move with the water table, which changes seasonally. During wet seasons, rising groundwater may shift contaminant plumes upward or laterally, affecting well screens differently depending on their depth and location. Understanding this dynamic helps explain intermittent VOC detections in water systems.
Explaining "Detected," "Median," and "Range" in Records
The public water system record for Butte Silverbow Water Department covers testing from 2013 to 2015 for a variety of VOCs including HCFC-22 and MTBE. "Detected" means laboratory instruments measured the compound at or above the reporting level. "Median" describes the middle value among results, and "Range" includes all detected concentrations. For example, none of these VOCs were detected above their specific reporting levels during this period.
Reading Your Certified Laboratory Test Results for VOCs
If you conduct a certified lab test on your household water, the report will list detected compounds and their concentrations. Values are expressed in micrograms per liter (µg/L) or parts per billion (ppb). Comparing your results against regional data and detection limits helps determine the extent of VOC presence, guiding treatment decisions.
Differences Between Gasoline and Dry-Cleaning Solvent Releases in Groundwater
Gasoline releases typically introduce a complex mix of VOCs such as MTBE, which can linger in groundwater and affect taste or odor. Dry-cleaning solvent releases may involve compounds like 1,1-dichloroethane. Each source has distinct chemical signatures and persistence patterns, which influence the choice and effectiveness of treatment methods.
What Detected VOC Ranges Mean Compared to Federal Standards—and What They Don’t
The Butte municipal system's testing shows no VOC detections above the reporting levels and no Health-Based Violations recorded by the EPA. This means the water system’s VOC levels are below federal maximum contaminant levels (MCLs) where they exist. It does not imply individual household taps are free of VOCs, as localized factors vary and only specific testing can confirm that. Detected levels well below concern thresholds indicate no federal health limit is exceeded in the water system.
To address potential VOC presence in your household water based on your test results and water use, water treatment options vary by compound and concentration. The C-Series VOCs & Industrial Chemicals Filter system ships ready to configure for residential water treatment needs and is designed to reduce a wide range of volatile organics effectively. Considering the specific VOC profile you measure can help determine if this class of filter meets your treatment requirements.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-04-28. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Butte Silverbow Water Department (MT0000170), MT: 84 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level