Understanding Your Laboratory Test Report

Reported PFAS compounds list individual detections, usually by chemical name and concentration

Values indicate the amount detected, never declaring safety or violation alone

Check that testing methods comply with federal standards for sensitivity and reporting

Look for PFOA, PFOS, PFHxS, PFNA, HFPO-DA, PFBS, PFHxA, PFPeA, PFBA, and PFHpA among listed compounds

Household-Specific Questions Before Choosing Treatment

Have you obtained a certified laboratory test of your own household water?

What volumes of water do you need filtered daily in your home?

Do you require removal of multiple PFAS compounds or a focus on a particular one?

Are you prepared to review ongoing testing to confirm treatment performance?

Industrial or Commercial Questions Not Typically Applied in Homes

Is continuous large-scale contaminant monitoring required for your operation?

Are there regulatory reporting needs tied to PFAS discharge or treatment results?

Do you manage multiple water sources with variable PFAS profiles?

Are high flow rates or special chemical handling equipment necessary?

Sources of PFAS in Fresno Water Systems

The City of Fresno’s supply is surface water, treated and monitored extensively

PFAS compounds are detected in some samples but no health-based violations are recorded

PFAS can enter drinking water from industrial discharges, consumer products, and environmental persistence

Variations in PFAS presence reflect environmental factors and treatment methods over time

Meaning of Fresno’s PFAS Measurement Range Compared to Federal Standards

Measured concentrations for PFOA and PFOS in Fresno’s system are below the 2024 federal maximum contaminant levels (MCLs)

Some detections are above reporting limits but do not equal health violations or unsafe water

PFHxS and other PFAS compounds have varying detection frequencies, with some results near or below forthcoming MCLs

Federal MCLs set limits to guide treatment decisions but do not diagnose individual water quality without testing

Potential Effects When PFAS Are Untreated Over Many Years

PFAS compounds resist breakdown and can accumulate in water systems and human bodies over time

Long-term exposure concerns have led to regulatory monitoring and emerging health studies

Mitigation equipment designed for PFAS removal can help reduce accumulation risks in household water

Regular water testing supports tracking changes and treatment effectiveness for peace of mind

Differences Between Public Water System Data and Private Well Testing

Public water system records reflect average and range across many connections, not individual homes

Private well water quality varies and must be tested directly to assess PFAS presence and concentration

Public system monitoring uses standardized sampling schedules and reporting thresholds

Households relying on public water receive ongoing quality reporting but should test if concerned about specific contaminants

What Fresno Residents Should Not Conclude From Public System Data Alone

Detection above reporting levels in the city system does not mean your home’s water exceeds safety limits

No health-based violations are recorded in Fresno’s monitored water system for PFAS as of current data

Testing your own household water is necessary to understand your exact PFAS levels and treatment needs

The C-Series PFAS Forever Chemicals Filter ships ready to configure and can be matched to household demands after testing

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