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Counties → Guam

Guam County, Guam

Water Systems
8
Population Served
327,417
Total Violations
203
94 health-based
PFAS Detected
3
of 5 tested

Violation Analysis

100.0%
Systems with Violations
25.4
Avg Violations per System
46.3%
Health-Based Violations

Water Source Types

GW
5 systems (63%)
SW
3 systems (38%)

PFAS Contamination

5
Systems Tested
3
PFAS Detected
60.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Guam Guam water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (8)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Gwa Northern Water System 139,207 30 Detected
Guam International Airport Authority 138,336 2 -
Gwa Central Water System 21,398 106 Clean
U.S. Navy Water System 12,780 23 Detected
Andersen Air Force Base Water System 7,700 10 Detected
Gwa Southern Water System 5,801 24 Clean
Guam Regional Medical City 1,100 3 -
Guam Plaza Resort Water System 1,095 5 -

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Guam County? ▼
Guam County has 203 total drinking water violations across 8 water systems, of which 94 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Guam County systems? ▼
Water systems in Guam County serve approximately 327,417 people through 8 public water systems.
Has PFAS been detected in Guam County water? ▼
Of 5 water systems tested for PFAS in Guam County, 3 had PFAS detected (60.0% detection rate).
What types of water sources supply Guam County? ▼
Water systems in Guam County use GW (5 systems), SW (3 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 46.3% of Guam County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.