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States → Guam

GWA SOUTHERN WATER SYSTEM

PWS ID: GU0000001 · MANGILAO, Guam 96913

Population Served
5,801
Total Violations
24
Health-Based Violations
7
Water Source
Surface Water

System Details

System Type
Community
Owner Type
State
Connections
1,900
County
Guam
School/Daycare
No
MCL Violations
7
Monitoring Violations
0
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MCL 4 2018
Total Haloacetic Acids (HAA5) MCL 3 2012

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 91 samples detected PFAS.

Contaminant Date Result MRL Status
lithium 7/7/2025 <9 µg/L 9 µg/L Not Detected
ADONA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 4/7/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 4/7/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 4/7/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 4/7/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 4/7/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 4/7/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 4/7/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 4/7/2025 <0.006 µg/L 0.006 µg/L Not Detected
HFPO-DA 4/7/2025 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 4/7/2025 <0.02 µg/L 0.02 µg/L Not Detected
9Cl-PF3ONS 4/7/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 4/7/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 4/7/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 4/7/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 4/7/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 4/7/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 4/7/2025 <9 µg/L 9 µg/L Not Detected
PFBA 4/7/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 4/7/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 10/27/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 10/27/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 10/27/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 10/27/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 10/27/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 10/27/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 10/27/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFOA 10/27/2025 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 10/27/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFDA 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 10/27/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 10/27/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFPeA 10/27/2025 <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.