Gwa Northern Water System
Published drinking-water records and contacts for Gwa Northern Water System. System GU0000006. Review sources and dates; not a real-time water assessment.
- System ID
- GU0000006
- State or territory
- GU
- Published population served
- 139207
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 3630 — 2023-09-04 – 2025-12-18
- Lead and copper monitoring summaries: 10 — 1992-01-01 – 2025-12-31
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Read the provider’s annual water quality report
Report link listed: 2026-10-07. This is not the report’s sampling date.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2025-12-18 | Well F-20 / 16102T |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-20 / 16102T |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2025-12-18 | Well F-20 / 16102T |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2025-12-18 | Well F-20 / 16102T |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2025-12-18 | Well F-20 / 16102T |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-13 / 61073T |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2025-12-18 | Well D-9 / 61043T |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2025-12-18 | Well F-13 / 61073T |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2025-12-18 | Well F-20 / 16102T |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-13 / 61073T |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2025-12-18 | Well F-13 / 61073T |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFPeA | 0.0035 µg/L | 0.003 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2025-12-18 | Well F-13 / 61073T |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2025-12-18 | Well D-9 / 61043T |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2025-12-18 | Well F-20 / 16102T |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2025-12-18 | Well F-20 / 16102T |
| lithium | < 9 µg/L | 9 µg/L | 2025-12-18 | Well F-13 / 61073T |
Download all EPA UCMR 5 records (CSV)
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.0017 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.0025 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0.0025 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Copper (CU90) | 170 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0.0019 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0.006 mg/L | 2003-01-01 – 2003-12-31 | 2026Q3 |
| Lead (PB90) | 0.0057 mg/L | 2002-07-01 – 2002-12-31 | 2026Q3 |
| Lead (PB90) | 0.0064 mg/L | 2002-01-01 – 2002-06-30 | 2026Q3 |
Published compliance history
15 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Inorganic Chemicals / Maximum Contaminant Level Violation, Average | 1985-01-29 – 1985-02-28 | Archived | Yes | 2026Q3 |
| Inorganic Chemicals / Maximum Contaminant Level Violation, Average | 1985-01-10 – 1985-02-09 | Archived | Yes | 2026Q3 |
| Inorganic Chemicals / Maximum Contaminant Level Violation, Average | 1985-01-07 – 1985-02-06 | Archived | Yes | 2026Q3 |
| Miscellaneous Other Rules / Operations Report | 1981-06-10 – 1981-07-09 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Operations Report | 1981-05-10 – 1981-06-09 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1981-03-14 – 1981-04-13 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Operations Report | 1981-02-10 – 1981-03-09 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Operations Report | 1981-01-10 – 1981-02-09 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1981-01-10 – 1981-02-09 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Operations Report | 1980-09-09 – 1980-10-08 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1980-08-14 – 1980-09-13 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Operations Report | 1980-07-10 – 1980-08-09 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1980-05-14 – 1980-06-13 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1979-12-14 – 1980-01-13 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1979-11-14 – 1979-12-13 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
Administrative contact (EPA filing)
Bordallo, Miguel: 671-300-6845
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.