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Overview of PFAS Detections in Fresno's Water System

The City of Fresno's public water system, serving over half a million residents via surface water sources, has recorded multiple detections of PFAS compounds in federal monitoring. These detections represent measurements but are not health violations, as the system maintains a record free of EPA health-based violations. Understanding these readings helps households consider water treatment choices effectively.

1. Plumbing Material and Age: Factors Separate from Source Water

While PFAS compounds originate from environmental sources, plumbing components and their age play a negligible role in PFAS presence in tap water. Residential plumbing in Fresno does not contribute PFAS; the numbers reported result from the water system's source and distribution. Concerns from plumbing typically relate to metals or other contaminants, so households focusing on PFAS can separate this factor from their treatment decisions.

2. How PFAS Enter Groundwater and Water Distribution in Fresno

PFAS substances in Fresno's water supply stem primarily from sources upstream of the surface water intake points and historical environmental releases in the region. These man-made chemicals persist in the environment and can accumulate in water bodies supplying the city. Continuous monitoring by the EPA under the Unregulated Contaminant Monitoring Rule (UCMR) captures their occurrence but does not equate to a failure of water safety standards.

3. Interpreting Median and Range Values in the Government Record

For example, for PFOA, Fresno's system recorded 36 detections above the reporting limit, with a highest measured concentration of 0.016 micrograms per liter and a median of those detections at 0.0058 micrograms per liter. Similar results exist for PFOS and other PFAS types. The median reflects a typical detected value while the highest indicates peak measurement in the monitoring period. Households should understand these represent a range of detected concentrations, not a single consistent level.

4. Understanding Measured Levels Against Federal Standards

Federal Maximum Contaminant Levels (MCLs) are set for some PFAS compounds such as PFOA and PFOS at 4.0 nanograms per liter. Fresno recorded several samples above this threshold, reflecting the sensitivity of detection rather than a water safety breach. These detections guide ongoing water quality management and inform treatment technology development but do not indicate mandatory action by residents based on public supply compliance alone.

5. How a Certified Laboratory Test Reports PFAS in Your Home Water

To know your home's specific PFAS concentrations, a certified laboratory test is required. Such tests report detailed levels for multiple PFAS compounds and clarify presence relative to health benchmarks. This personalized data is essential to tailor treatment choices, as system-wide monitoring cannot predict individual tap water quality due to variables like premise plumbing and water use patterns.

6. Impact of Sample and Well Depth on Expected PFAS Concentration

Sampling depth and water source type affect expected PFAS levels significantly. Surface water systems like Fresno's differ from groundwater wells, which may have different PFAS profiles depending on aquifer characteristics and contamination pathways. Homeowners with wells should consider their unique conditions when evaluating PFAS presence and treatment needs.

Concluding Step: Ordering a Comprehensive PFAS Test for Your Household

The critical step for Fresno residents weighing treatment options is to have a certified laboratory conduct a thorough PFAS analysis of their household water. This test settles the question of actual exposure and informs the choice between treatment technologies.

For those deciding on treatment equipment, the Fleck PFAS Forever Chemicals Filter ships ready to configure and uses proven technology to reduce a range of PFAS contaminants effectively. With knowledge of your water's specific PFAS levels, you can select a solution that fits your household's needs.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2025-12-16. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for CITY OF FRESNO (CA1010007), CA: 3390 results across 10 listed contaminants, 211 detections above the reporting level; 85 results above a 2024 federal MCL