County · North Dakota
Williams County, North Dakota: drinking water records
This overview covers 9 ZIP codes and 11 community water systems in Williams County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Williston City of ND5301012 | 26,426 | 120 | 0 | 0 | 0 ppb |
| Northwest Rural Water District ND5301079 | 5,102 | 120 | 1 | 0 | 0 ppb |
| Grenora City of ND5300425 | 244 | 60 | 0 | 0 | 0 ppb |
| Prairie View HOA ND5301766 | 226 | 0 | 0 | 1 | 0 ppb |
| Tioga City of ND5300936 | 2,202 | 0 | 0 | 0 | 0 ppb |
| R & T Water System ND5301152 | 1,003 | 0 | 0 | 0 | 1.7 ppb |
| Ray City of ND5300809 | 950 | 0 | 0 | 0 | 0 ppb |
| Trenton Water Users Assoc ND5300948 | 840 | 0 | 0 | 0 | 0.8 ppb |
| Inspire Communities-Springbrook ND5301063 | 300 | 0 | 0 | 0 | 0 ppb |
| Wildrose City of ND5301011 | 110 | 0 | 0 | 0 | 26.3 ppb |
| Western Area Water Supply Authority ND5301686 | 0 | 0 | 0 | 0 | not reported |
ZIP reports in Williams County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.