Search city, ZIP, contaminant⌘KFind my water

Forensic evidence record · ev-ca5410010-f-porterville-pfoa

Perfluorooctanoic acid (PFOA)

A single published measurement record with its qualifier, sampling context, source identifier, method note, and stated limitations kept together.

Published evidence record

22 ng/LReported measurement
Back to water-system profile
22 ng/Lreported result
Not verified from sourcereporting limit
Sample date: 2023-05-15 to 2023-11-20sample date
2026-10-15publication date
Source observations (58)
  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-07 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-14 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-05 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-03 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-33 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-09 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-25 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-11 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-11 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-08 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-21 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-04 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-19 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-03 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-15 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-01 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-27 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-19 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-13 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-23 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-12 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-17 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-13 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-10 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-01 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-11 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-09 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-09 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-31 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-07 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Detected above reporting limit. = 0.02 µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-11 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Detected above reporting limit. = 0.022 µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-07 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-29 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-06 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-35 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-02 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-15 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-05 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-13 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-12 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-03 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-01 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-03 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-06 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-01 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-05 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-17 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-02 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-21 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2700-10 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-07 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-08 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-05 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-04 · Method EPA 533

  • PFOA — Sample date: 2023-05-22

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE3140-09 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-13 · Method EPA 533

  • PFOA — Sample date: 2023-05-15

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGE2095-37 · Method EPA 533

  • PFOA — Sample date: 2023-11-20

    Below reporting limit. < Result value not available µg/L

    Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable

    Source: src-ucmr5-2024 · UCMR5_All.txt · Sample AGK2698-15 · Method EPA 533

Measurement evidence

Analyte
Perfluorooctanoic acid (PFOA)
Result qualifier
=
Reference basis
4.0 ng/L federal MCL (2024)
Sampling location
Entry Point to Distribution
Water system ID
CA5410010
Source ID
src-ucmr5-2024

Laboratory context

No laboratory method note was published with this record.

Sampling context

This result represents a entry point to distribution sample. It does not establish the condition at every distribution point or household tap.

Record limitation

System-level entry-point monitoring; not a measurement of the water at an individual household tap.

Source provenance

UCMR5 Analytical Results

Fifth Unregulated Contaminant Monitoring Rule (UCMR5) — PFAS occurrence data

U.S. Environmental Protection Agency · Published 2024

Nationwide entry-point monitoring for 29 PFAS and lithium under the fifth UCMR cycle. Results are entry-point-to-distribution samples, not household-tap measurements.

Open source profile →Original record

How to interpret this record

This page preserves one measurement. Interpretation requires its qualifier, reporting limit, reference basis, date, sampling location, and limitations; the number alone is not a safety verdict.

Review finding states →

Related intelligence

Water-system profileData sourcesMethodologyEvidence verification