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PFAS in drinking water: U.S. Virgin Islands

EPA UCMR 5 results for 3 public water systems. 1 had at least one PFAS detected; 1 had a highest single PFOA or PFOS result above 4.0 ppt.

UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.

Water system	Serves	PFOA max (ppt)	PFOS max (ppt)	PFAS detected
Nisky Center VI1000037	St. Thomas Island County	5.2	ND	4
Water and Power Authority-STT VI0000443	St. Thomas Island County	ND	ND	0
Water and Power Authority-STX VI0000097	St. Croix Island County	ND	ND	0

ND = not detected (below the 4 ppt UCMR 5 reporting level). Values are the highest single sample result, not an annual average.

Source: EPA UCMR 5 final occurrence data (EPA page last updated 2026-08-28; samples collected January 2023 – December 2025) ↗.

PFAS disclaimer: PFAS results are copied from EPA's UCMR 5 dataset and describe samples taken at a public water system's entry points between 2023 and 2025, not water at any specific address. Levels may have changed since sampling (for example, after new treatment). “Not detected” means below EPA's UCMR 5 minimum reporting level, not zero. This is not a compliance determination or a water test. Contact your water utility for current information.