Forensic evidence record · ev-ma2002000-f-acton-district-pfba
Perfluorobutanoic acid (PFBA)
A single published measurement record with its qualifier, sampling context, source identifier, method note, and stated limitations kept together.
Published evidence record
20.6 ng/LReported measurementSource observations (10)
- PFBA — Sample date: 2023-03-15
Detected above reporting limit. = 0.0118 µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-56823-1 · Method EPA 533
- PFBA — Sample date: 2023-06-28
Detected above reporting limit. = 0.0141 µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-67971-1 · Method EPA 533
- PFBA — Sample date: 2023-09-21
Detected above reporting limit. = 0.0206 µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-79057-1 · Method EPA 533
- PFBA — Sample date: 2024-01-05
Detected above reporting limit. = 0.0183 µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-89969-1 · Method EPA 533
- PFBA — Sample date: 2023-03-15
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-56826-1 · Method EPA 533
- PFBA — Sample date: 2023-06-05
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-65235-1 · Method EPA 533
- PFBA — Sample date: 2023-09-18
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-78173-1 · Method EPA 533
- PFBA — Sample date: 2023-12-06
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-87135-1 · Method EPA 533
- PFBA — Sample date: 2023-03-13
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-56819-1 · Method EPA 533
- PFBA — Sample date: 2023-09-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.005 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample 810-79058-1 · Method EPA 533
Measurement evidence
- Analyte
- Perfluorobutanoic acid (PFBA)
- Result qualifier
- =
- Reference basis
- No federal or state limit; shown for transparency
- Sampling location
- Entry Point to Distribution
- Water system ID
- MA2002000
- 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.
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