PFAS Analyte · UCMR 5

PFUnA

Perfluoroundecanoic acid

CAS 2058-94-8· UCMR 5· No individual MCL set
6
Systems monitored
with official records
6
Systems with detections
100.0% detection rate
12
Detected samples
of 12 total samples
Feb 2023 – Sep 2025
Monitoring period
per UCMR 5 schedule

Detection Rate — PFUnA

Systems with any detection100.0%

6 of 6 monitored systems

Sample-level detection rate100.0%

12 detections across 12 total samples

States with Most PFUnA Detections

1
PA

Pennsylvania

5 detections

2
TX

Texas

5 detections

3
DE

Delaware

2 detections

Water Systems with Most PFUnA Detections

Systems ranked by number of samples detected above the minimum reporting limit. Detection count reflects monitoring frequency, not concentration level.

1

City of Pflugerville

TX2270014 · TX · 63,464 served

4 detected2

Emmaus Borough Public Water

PA3390032 · PA · 14,000 served

3 detected3

Veolia Water Delaware, Inc

DE0000564 · DE · 100,495 served

2 detected4

Doylestown Boro Water Dept

PA1090081 · PA · 8,700 served

1 detected5

Manville Wsc

TX2270033 · TX · 39,648 served

1 detected6

Paw Frackville

PA3540032 · PA · 5,583 served

1 detected

All records are from official EPA UCMR 5 monitoring data. Detection counts reflect the number of samples where the analyte was reported above the minimum reporting limit (MRL). They are not compliance determinations and do not imply a health violation.

PFUnA at a Glance

Full NamePerfluoroundecanoic acid
CAS Number2058-94-8
UCMR RoundUCMR 5
EPA MCLSee mixture rule
Systems Monitored6
Systems Detected6
Detection Rate100.0%

Note

No MCL as of April 2024.

EPA PFAS Drinking Water RegulationEPA UCMR 5 Source Data Back to PFAS Watchlist