10 community and non-transient non-community water systems are listed for American Samoa in EPA SDWIS. 1 were sampled under UCMR 5; 1 of those had at least one PFAS result at or above the reporting level, and 0 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
American Samoa map · Download: systems (CSV) · all results (CSV, gzip)
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Sampled under UCMR 5 (1)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Central Asg | AS9711948 | Pago Pago | 45,315 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
Not tested under UCMR 5 (9)
UCMR 5 required monitoring by systems serving 3,300 or more people and by a representative sample of smaller systems. The systems below have no UCMR 5 results in EPA's data. Not tested is not the same as not detected: the absence of results says nothing about PFAS in their water.
| System | PWSID | Type | City | Population | Counties |
|---|---|---|---|---|---|
| Afono Asg | AS9710858 | CWS | Pago Pago | 327 | Eastern District |
| Aoa Asg | AS9710652 | CWS | Pago Pago | 344 | Eastern District |
| Aunuu Asg | AS9310751 | CWS | Pago Pago | 402 | Eastern District |
| Fagasa Asg | AS9711356 | CWS | Pago Pago | 577 | Western District |
| Fitiuta Asg | AS9630145 | CWS | Pago Pago | 213 | Manu'a District |
| Masefau Asg | AS9710855 | CWS | Pago Pago | 457 | Eastern District |
| Ofu - Olosega Asg | AS9430546 | CWS | Pago Pago | 270 | Manu'a District |
| Tau-Faleasao Asg | AS9630243 | CWS | Pago Pago | 236 | Manu'a District |
| Vatia Asg | AS9710657 | CWS | Pago Pago | 460 | Eastern District |