Guam Drinking Water Compliance Records
5 water systems serving 186,886 people. 13 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
5
100%
B
0
0%
C
0
0%
D
0
0%
F
0
0%
5
Water Systems
186,886
Population Served
13
Historical Records
0
Health-Based (All Years)
Systems With the Most Recent EPA Records
U.S. NAVY WATER SYSTEM
12,780 served1 historical record
A
ANDERSEN AIR FORCE BASE WATER SYSTEM
7,700 served0 historical records
A
GWA NORTHERN WATER SYSTEM
139,207 served1 historical record
A
GWA CENTRAL WATER SYSTEM
21,398 served10 historical records
A
GWA SOUTHERN WATER SYSTEM
5,801 served1 historical record
A
Large Systems With No Recent Records
GWA NORTHERN WATER SYSTEM
139,207 served1 historical record
A
GWA CENTRAL WATER SYSTEM
21,398 served10 historical records
A
U.S. NAVY WATER SYSTEM
12,780 served1 historical record
A
ANDERSEN AIR FORCE BASE WATER SYSTEM
7,700 served0 historical records
A
GWA SOUTHERN WATER SYSTEM
5,801 served1 historical record
A
Largest Water Systems in Guam
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| GWA NORTHERN WATER SYSTEM | A | 139,207 | 1 |
| GWA CENTRAL WATER SYSTEM | A | 21,398 | 10 |
| U.S. NAVY WATER SYSTEM | A | 12,780 | 1 |
| ANDERSEN AIR FORCE BASE WATER SYSTEM | A | 7,700 | 0 |
| GWA SOUTHERN WATER SYSTEM | A | 5,801 | 1 |
Contaminants in Guam
Lead in GuamArsenic in GuamNitrate in GuamFluoride in GuamPFOS in GuamPFOA in GuamTHMs in GuamHAA5 in Guam
Cities in Guam
MANGILAO(3)ASAN(2)ADELUP(2)AGANA HEIGHTS(2)ANIGUA(2)PIGO(2)TALOFOFO(2)ADACAO(1)DEDEDO(1)TAMUNING(1)TUMON(1)APRA HEIGHTS(2)AGAT(1)PITI(1)SANTA RITA(1)FP(1)GUAM NAVAL MAGAZINE(1)GUAM NAVAL FACILITY(1)GUAM NAVAL REGIONAL MEDICAL CE(1)GUAM NAVAL SHIP REPAIR FACILIT(1)GUAM NAVAL STATION(1)GUAM NAVAL SUPPLY DEPOT(1)NAVAL COMMUNICATIONS AREA MAST(1)NORTH TIPALAO(1)SOUTH TIPALAO(1)SUMAY(1)APO AP(1)UNATAC(1)