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States → Montana

MALMSTROM AIR FORCE BASE

PWS ID: MT0000515 · MALMSTROM AIR FORCE BASE, Montana 59402

PFAS Detected

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

Population Served
8,850
Total Violations
82
Health-Based Violations
39
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Federal
Connections
2
County
Cascade
School/Daycare
No
MCL Violations
39
Monitoring Violations
35
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Total Haloacetic Acids (HAA5) MCL 39 2019
Coliform (TCR) MR 12 2005
Total Haloacetic Acids (HAA5) MR 9 2024
TTHM MR 9 2024
Consumer Confidence Rule Other 8 2023
Revised Total Coliform Rule MON 3 2024
Lead and Copper Rule MR 2 2021

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 12 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
PFOS 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/28/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/28/2023 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 8/28/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFOA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/28/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFBA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/28/2023 <0.02 µg/L 0.02 µg/L Not Detected
NMeFOSAA 8/28/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFPeS 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
lithium 8/28/2023 59.0000 µg/L 9 µg/L Detected
PFEESA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/28/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFNA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 8/28/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 8/28/2023 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/28/2023 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
lithium 8/28/2023 64.0000 µg/L 9 µg/L Detected
PFPeA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/28/2023 <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.