PlainWater
States → Wyoming

YNP-OLD FAITHFUL

PWS ID: WY5680085 · YELLOWSTONE, Wyoming 82190

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
7,675
Total Violations
35
Health-Based Violations
18
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Federal
Connections
153
County
Teton
School/Daycare
No
MCL Violations
10
Monitoring Violations
13
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 10 2023
Lead and Copper Rule MR 4 2024
Lead and Copper Rule TT 4 2024
CARBON, TOTAL MR 3 2005
Long Term 2 Enhanced Surface Water Treatment Rule TT 2 2022
Interim Enhanced Surface Water Treatment Rule TT 1 2022
TTHM MR 1 2023
Total Haloacetic Acids (HAA5) MR 1 2023
Nitrate MR 1 1993
Surface Water Treatment Rule MR 1 2022
Revised Total Coliform Rule MON 1 2022
Coliform (TCR) MR 1 1995
Surface Water Treatment Rule TT 1 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
NMeFOSAA 8/23/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 8/23/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/23/2023 <0.008 µg/L 0.008 µg/L Not Detected
lithium 8/23/2023 55.7000 µg/L 9 µg/L Detected
NEtFOSAA 8/23/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 5/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 5/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 5/15/2023 <0.002 µg/L 0.002 µg/L Not Detected
lithium 5/15/2023 63.0000 µg/L 9 µg/L Detected
NMeFOSAA 5/15/2023 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 5/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 5/15/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 5/15/2023 <0.008 µg/L 0.008 µg/L Not Detected
NFDHA 5/15/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 5/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 5/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 5/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/15/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 5/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 5/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 5/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 5/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 5/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 2/27/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFBS 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 2/27/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 2/27/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 2/27/2023 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 2/27/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 2/27/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 2/27/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 2/27/2023 <0.003 µg/L 0.003 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.