What Can Government Data Tell You About PFAS in Your Area?
The federal Environmental Protection Agency (EPA) collects data on unregulated contaminants, including PFAS (per- and polyfluoroalkyl substances, often called "forever chemicals"), in public water systems. For residents of Deschutes County, Oregon, the Bend Water Department provides water drawn from surface sources to over 77,000 people. The EPA's monitoring between May 2023 and August 2024 sampled this system 20 times for various PFAS compounds.
These results show that some PFAS compounds were detected above laboratory reporting levels, but such detections are not violations or safety breaches. Instead, they are measurements indicating the presence of these substances at very low concentrations. To know the PFAS levels in your specific home water, individual testing through a certified laboratory is necessary. Regional data helps understand overall trends and can guide decisions but does not replace a direct home water test.
Why Are Granular Carbon Beds and Ion-Exchange Resins Treated Differently for PFAS?
Two common methods to reduce PFAS in water are granular activated carbon (GAC) and anion exchange resins. Granular carbon filters physically adsorb PFAS molecules onto their surface, capturing many types of these fluorinated compounds. Ion-exchange resins, meanwhile, use charged particles to attract and bind PFAS molecules, often targeting specific ionic forms more effectively.
The choice between these relies on factors such as the specific PFAS compounds present, their concentrations, water chemistry, and system design. Each technology has documented effectiveness profiles for different PFAS types. Understanding these differences is important when choosing the right treatment class for a household’s needs.
Which PFAS Compounds in Bend Water Have Federal Limits and Which Do Not?
Recent federal standards, effective in 2024, set Maximum Contaminant Levels (MCLs) for some PFAS compounds. In Bend’s water system monitoring:
- PFOA (Perfluorooctanoic acid) was detected twice, with one result slightly above the new MCL of 4.0 nanograms per liter (ng/L or parts per trillion, ppt).
- PFOS (Perfluorooctane sulfonate), a significant PFAS component, was not detected above reporting levels.
- PFHxS (Perfluorohexane sulfonate), PFNA (Perfluorononanoic acid), and HFPO-DA (Hexafluoropropylene oxide dimer acid) were not detected above relevant reporting levels or MCLs.
- Other PFAS compounds like PFHxA, PFPeA, and PFHpA appeared at low levels but currently do not have federal MCLs.
Knowing which compounds have enforceable limits and which do not helps prioritize treatment approaches that comply with current standards.
How Reliable Are These Monitoring Results Given the Number of Samples?
The Bend Water Department’s data comes from 20 samples taken from the system's surface water source. While this provides useful insight into regional water quality, 20 results represent a relatively small sample size for understanding continuous variation. Some low-level detections might reflect transient fluctuations or localized sources.
For a household considering treatment, this means while the public data suggests presence of some PFAS at low levels, individual testing is crucial. A small sample provides a snapshot but not a comprehensive timeline of water quality.
What Steps Should You Take to Rule Out PFAS Concerns Before Choosing Treatment?
Before selecting a treatment system, consider these steps ranked from least to more involved:
- Confirm your water source: Municipal supply or private well, as public data applies primarily to the municipal system.
- Review your water utility’s water quality reports: These often include summary results for contaminants including PFAS.
- Perform laboratory testing of your tap or well water: This offers specific concentrations of relevant PFAS in your household supply.
- Assess your daily water usage: Understanding volume helps determine treatment system size and capacity needed.
How to Match Treatment Capacity to Your Daily Water Demand?
Treatment systems designed to reduce PFAS should be sized based on the projected volume of water used daily in your home. This ensures effective removal without frequent filter replacement or performance degradation. Measuring or estimating household water use—commonly averaging around 50 to 100 gallons per person per day—provides a baseline for selecting an appropriate system capacity.
What Solution Is Recommended After You Know Your Demand and Testing?
For homeowners in Deschutes County seeking to address PFAS in their drinking water, the C-Series PFAS Forever Chemicals Filter is a documented option that effectively reduces per- and polyfluoroalkyl substances. It ships ready to configure and can be selected and sized to match your household’s daily water use based on laboratory testing results. Choosing such a system after confirming your water’s PFAS profile offers a targeted step to manage these 'forever chemicals' effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2024-08-14. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for BEND WATER DEPARTMENT (OR4100100), OR: 200 results across 10 listed contaminants, 6 detections above the reporting level; 1 results above a 2024 federal MCL