Results from entry points (water leaving treatment, not household taps) of public water systems sampled under EPA's Fifth Unregulated Contaminant Monitoring Rule. Click a county to see every water system serving it, or turn on service areas and click a location to see the systems that serve that spot.
2 of the 48 public water systems listed for Northern Mariana Islands were sampled. Sorted by the highest single result relative to EPA's 2024 limits. Each name links to a page with all of that system's results. All 48 Northern Mariana Islands systems, including those not tested · Download all Northern Mariana Islands results (CSV, gzip)
| System | PWSID | City | Population | PFOA (ppt) | PFOS (ppt) | HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Commonwealth Utilities Corp (Saipan) | MP0000001 | Saipan | 48,524 | <MRL | 32.1 | 1.967 | PFOS ≥ 3 × its limit |
| Commonwealth Health Corporation | MP0000171 | Saipan | 744 | <MRL | <MRL | 0 | No PFAS detected |
Highest single result for each system; PFOA and PFOS in ppt (ng/L). Entry-point samples, not tap water; screening comparisons, not compliance determinations.