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States → California

MAMMOTH MOUNTAIN SKI AREA - OUTPOST 14

PWS ID: CA2600624 · MAMMOTH LAKES, California 93546

PFAS Detected

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

Population Served
7,736
Total Violations
31
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
25
County
Mono
School/Daycare
No
MCL Violations
0
Monitoring Violations
14
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 12 2014
Lead and Copper Rule MR 1 1993
Gross Alpha, Excl. Radon and U MR 1 1981

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpS 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 5/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 5/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 5/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 5/20/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFBS 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 5/20/2024 15.8000 µg/L 9 µg/L Detected
NMeFOSAA 5/20/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 5/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 5/20/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 5/20/2024 <0.008 µg/L 0.008 µg/L Not Detected
8:2 FTS 5/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 5/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 5/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 5/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 5/20/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 5/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/20/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 5/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 11/6/2024 12.0000 µg/L 9 µg/L Detected
NMeFOSAA 11/6/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 11/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 11/6/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 11/6/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFPeS 1/29/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 1/29/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 1/29/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 1/29/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 1/29/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 1/29/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 1/29/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 1/29/2025 <0.004 µg/L 0.004 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.