Northern Mariana Islands: public water systems and their UCMR 5 PFAS results

48 community and non-transient non-community water systems are listed for Northern Mariana Islands in EPA SDWIS. 2 were sampled under UCMR 5; 1 of those had at least one PFAS result at or above the reporting level, and 1 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).

Northern Mariana Islands 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.