Forensic evidence record · ev-ca3610038-f-rialto-pfhxs
Perfluorohexanesulfonic acid (PFHxS)
A single published measurement record with its qualifier, sampling context, source identifier, method note, and stated limitations kept together.
Published evidence record
3.5 ng/LReported measurementSource observations (19)
- PFHxS — Sample date: 2023-08-24
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3H3560-01 · Method EPA 533
- PFHxS — Sample date: 2023-10-04
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3J0631-01 · Method EPA 533
- PFHxS — Sample date: 2024-02-29
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4B3793-01 · Method EPA 533
- PFHxS — Sample date: 2024-04-24
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4D3596-01 · Method EPA 533
- PFHxS — Sample date: 2023-07-19
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G2554-01 · Method EPA 533
- PFHxS — Sample date: 2024-01-04
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A0637-03RE1 · Method EPA 533
- PFHxS — Sample date: 2023-07-19
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G2554-03 · Method EPA 533
- PFHxS — Sample date: 2024-01-04
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A0637-05RE1 · Method EPA 533
- PFHxS — Sample date: 2023-07-19
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G2554-05 · Method EPA 533
- PFHxS — Sample date: 2024-01-04
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A0637-07RE1 · Method EPA 533
- PFHxS — Sample date: 2023-09-26
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3I3362-01 · Method EPA 533
- PFHxS — Sample date: 2024-01-04
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A0637-09RE1 · Method EPA 533
- PFHxS — Sample date: 2023-07-19
Detected above reporting limit. = 0.0035 µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G2554-09 · Method EPA 533
- PFHxS — Sample date: 2024-01-04
Detected above reporting limit. = 0.0034 µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A0637-11RE1 · Method EPA 533
- PFHxS — Sample date: 2023-08-24
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3H3561-01 · Method EPA 533
- PFHxS — Sample date: 2023-07-19
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G2554-13 · Method EPA 533
- PFHxS — Sample date: 2024-01-04
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A0637-13RE1 · Method EPA 533
- PFHxS — Sample date: 2023-07-19
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G2554-15 · Method EPA 533
- PFHxS — Sample date: 2024-04-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.003 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4D3861-01 · Method EPA 533
Measurement evidence
- Analyte
- Perfluorohexanesulfonic acid (PFHxS)
- Result qualifier
- =
- Reference basis
- 10.0 ng/L federal MCL (2024)
- Sampling location
- Entry Point to Distribution
- Water system ID
- CA3610038
- 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.
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 →