Opening: What Government Testing Shows for Deschutes County Water Systems
The EPA’s records for the Bend Water Department, serving over 77,000 people in Deschutes County, Oregon, show no detected levels above reporting limits for volatile organic compounds (VOCs) such as 1,1-dichloroethane, chloromethane, bromomethane, HCFC-22, Halon 1011, 1,3-butadiene, or MTBE. This surface water source is monitored regularly under the federal Unregulated Contaminant Monitoring Rule (UCMR3, 2013-2015).
1. Why Volatility Matters: Exposure Through Showering, Dishwashing, and Inhalation Routes Versus Drinking
VOCs are volatile organic compounds known as solvent compounds that can enter household water supplies. While drinking water is a direct exposure route, these compounds can also vaporize during activities such as showering and dishwashing. This can lead to inhalation exposure, which some studies suggest may be significant compared to ingestion. Understanding the volatility of these compounds helps households weigh the importance of filtration for vapor-phase as well as liquid-phase exposure.
2. How Seasonal Water-Table Changes Move a Solvent Plume Relative to a Well Screen
Seasonal fluctuations in groundwater levels can shift the position of volatile solvent plumes relative to a well screen or water intake source. While the Bend Water Department uses surface water, private wells and other local sources may experience these shifts, affecting the concentration of VOCs in drawn water. This movement occurs because water tables rise and fall with precipitation and usage patterns, which may transiently increase or decrease VOC presence near water intakes.
3. What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
The EPA’s occurrence data for Deschutes County water shows ‘not detected’ results for monitored VOCs above specific reporting levels—this means the instruments measuring these chemicals did not find amounts above the threshold set for recording. No federal maximum contaminant levels (MCLs) exist for these VOCs in public water systems, so 'detected' simply indicates presence, not a violation or unsafe condition. Median and range values summarize concentration data where found, but here, the data reflects non-detections in all samples.
4. How VOCs Enter Groundwater or the Distribution System in This Region
In Deschutes County, VOCs like 1,1-dichloroethane and MTBE can originate from industrial solvents, gasoline leaks, or chemical spills. These compounds often infiltrate surface waters and groundwater through runoff or infiltration from environmental releases. Public systems using surface water have treatment and monitoring programs to track such compounds. Nonetheless, solvent compounds may enter household water distribution networks through source water contamination or transient plumbing system interactions.
5. How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The EPA UCMR3 data for this area is based on 16 to 22 sampling events from the Bend Water Department system between 2013 and 2015. While this volume provides a regional snapshot, it represents only public system monitoring points, not individual household wells. A limited number of samples means the data gives an overview of system-wide water quality but cannot confirm conditions at a single residence. Homeowners concerned about VOCs should perform targeted water testing specific to their source and use patterns.
Closing Summary and Source
The EPA’s public water system records for the Bend Water Department in Deschutes County confirm no measurable VOC levels above reporting limits for the compounds tested during the last federal monitoring cycle. These data represent the system’s surface water source and service connections, not individual household plumbing. For households weighing treatment options against volatile solvent compounds, the Fleck VOCs & Industrial Chemicals Filter ships ready to configure for residential use and is documented to reduce solvent compound concentrations effectively. For complete information, consult the EPA UCMR database at epa.gov.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-10-20. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Bend Water Department (OR4100100), OR: 148 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level