Area Data and Its Limits for Your Household's Water
When considering PFAS—per- and polyfluoroalkyl substances, also known as "forever chemicals"—it is important to understand the distinction between regional water testing results and the water from your own household tap. Government testing provides data about water systems serving large populations, such as the Parker Water and Sanitation District (Parker WSD) in Douglas County, Colorado. These results reflect the water system's quality as a whole but cannot specify individual water quality for any particular home or well. To determine your home's specific PFAS levels, individual water testing would be necessary.
Firefighting Foam, Textile Finishing, and Landfills: PFAS Sources in the Region
PFAS compounds historically have been linked to several sources, including firefighting foams, textile finishing processes, and landfill leachate. The Parker WSD water supply comes from surface water, which can be influenced by upstream activities such as industrial discharges and environmental runoff. Although these sources are recognized as possible contributors to PFAS presence in water, the system's monitoring data does not specify the exact origin of detected compounds within Douglas County.
Granular Carbon Beds versus Ion-Exchange Resins for PFAS Treatment
Different water treatment technologies address PFAS in distinct ways. Granular activated carbon filters work by adsorbing PFAS molecules onto their surfaces, effectively reducing their concentration in water. Ion-exchange resins operate by exchanging PFAS ions in water with other ions, capturing the contaminants. These approaches vary in efficiency depending on the specific PFAS compound and concentration. The Pentair PFAS Forever Chemicals Filter uses advanced filtration technology to reduce a broad range of fluorinated compounds, offering homeowners a direct-purchase option that ships ready to configure for residential water treatment.
Interpreting Median and Range PFAS Results as a Homeowner
The EPA Unregulated Contaminant Monitoring Rule (UCMR5) data for Parker WSD between 2024 and 2025 reports PFOA detections above the reporting level in 2 out of 26 tests, with the highest measurement at 0.0048 micrograms per liter (µg/L). Other PFAS such as PFBS, PFHxA, PFPeA, and PFBA also appeared in some samples but below applicable standards. The median values offer an average level of occurrence detected, while the range indicates the spread of concentrations found. These figures provide a general idea of what residents might expect but do not specify individual home water results.
The Measured PFAS Range Compared to Federal Standards
The federal Maximum Contaminant Level (MCL) for PFOA and PFOS is 4.0 nanograms per liter (ng/L), equivalent to 0.004 µg/L. The highest PFOA detection of 0.0048 µg/L slightly exceeds this level, but this is a monitoring result and not a violation or indication of unsafe water under EPA regulations. No PFOS levels were reported above the detection threshold. The presence of other PFAS was detected at lower concentrations, all below relevant federal MCLs. These data points suggest low-level detection rather than confirm the presence of harmful contamination at residences.
Sample Size and What It Means for Water Quality Reliability
The 26 samples taken from Parker WSD represent a snapshot of water quality over time and locations within the distribution system. While these results are useful for monitoring trends and informing regulation, they reflect a limited sample size relative to the entire system's connections. Homeowners should recognize that local plumbing, water source variations, or additional contamination could result in different PFAS levels. For precise determination, direct water testing is advisable.
Potential Consequences of Untreated PFAS Over Time
Long-term exposure to certain PFAS at elevated levels may lead to health concerns, but the presence of low-level detections in public water does not establish risk. Without treatment, PFAS compounds can accumulate due to their persistent chemical structure. Using effective filtration, such as the Pentair PFAS Forever Chemicals Filter, can reduce these substances, providing an additional safeguard for residential water quality over time.
What Douglas County Data Should Not Lead You to Assume
Area-wide water system results do not equate to individual household water conditions. Detection in municipal water above reporting levels is not a legal violation or a sign of unsafe water by itself. Residents should not conclude their home water is contaminated based solely on system data but should consider individual testing. Furthermore, the presence of PFAS detections within regulatory thresholds indicates ongoing monitoring rather than immediate health threats.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-07-01. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for PARKER WSD (CO0118040), CO: 260 results across 10 listed contaminants, 28 detections above the reporting level; 2 results above a 2024 federal MCL
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