Population Served
139.2K
Service Connections
39.5K
Total Violations
30
Health-Based Violations
6
Lead & Copper Data
Lead Level
Caution1.70 ppb
Action Level: 15 ppb (EPA) · Sampled: 2025-12-31
015 ppb action level
Copper Level
170000 ppb
Action Level: 1,300 ppb (EPA) · Sampled: 2022-12-31
Copper action level exceeded
System Details
- Water Source
- Groundwater
- System Type
- Community Water System
- City
- MANGILAO
- ZIP Code
- 96913
- Counties Served
- Guam
- Cities Served
- TAMUNING, TALOFOFO, ADACAO, DEDEDO, TUMON, ASAN, ADELUP, AGANA HEIGHTS + 2 more
- Open Violations
- 0
- State
- Guam
Violation Summary
30
Total Violations
6
Health-Based
0
Open Now
Most recent violation: 1985-01-29
Explore Guam Water Quality
See all water systems, lead data, and violation trends for Guam.
Data source: EPA ECHO SDWIS Bulk Download (Jan 2026). PWSID: GU0000006.SafeWater Home