County profile · EPA SDWIS + UCMR5
Williams County, North Dakota
22 SDWIS-listed public water systems serve 38,366 people in Williams County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 22
- SDWIS water systems Middle third of counties
- 564
- Total violations Lower third of counties
- 95.5%
- SDWIS systems w/ a violation Middle third of counties
- 33.3%
- UCMR5 PFAS rate (3 tested) Middle third of counties with tests
SDWIS compliance plate
Sheet ND105 · Williams County 22 sys · 564 viol · #1151/3254
VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · ABOVE-PEER · PFAS-MID · SRC-SW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 95.5% flagged
- HEALTH-LOW 13.7% health
- RANK-UPPER #1151/3254
- ABOVE-PEER +2.6 pp
- PFAS-MID 33.3% detect
- SRC-SW SW lead 73%
- SYS-SMALL 22 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Ward County ( -2.6 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Williams County ranks #1,151 of 3,254 counties by people served, and #5 of 52 counties in North Dakota. See methodology · corpus placement.
Williams County standing, mid-flagged corpus third
Flagged-system rate 95.5% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 13.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 33.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #1,151 of 3,254 · #5 of 52 in North Dakota.
Flagged-rate neighbourhood around Williams County
Lowest/highest poles plus in-state counties nearest Williams County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Williston City Of | 26,426 | 42 | Clean |
| Northwest Rural Water District | 5,102 | 26 | Detected |
| Tioga City Of | 2,202 | 7 | - |
| R & T Water System | 1,003 | 10 | - |
| Ray City Of | 950 | 5 | - |
| Trenton Water Users Assoc | 840 | 59 | - |
| Glacier Potable Water | 500 | 16 | - |
| Inspire Communities-Springbrook | 300 | 62 | - |
| Grenora City Of | 244 | 73 | Clean |
| Prairie View HOA | 226 | 53 | - |
| Wildrose City Of | 110 | 56 | - |
| Missouri-Yellowstone Interpretive Center | 100 | 39 | - |
| Stallion Oilfield Services-Williston | 90 | 14 | - |
| 13 Mile Center | 50 | 16 | - |
| Big Country RV Park | 48 | 7 | - |
| Little Beaver Bay Rec Area | 40 | 17 | - |
| Fendee Estates | 30 | 16 | - |
| The Bluffs HOA | 30 | 9 | - |
| Mondak Portables (Water Hauler) | 30 | 4 | - |
| B & B RV | 25 | 22 | - |
| Little Egypt Campground | 20 | 11 | - |
| Western Area Water Supply Authority | 0 | 0 | - |
Compare beyond North Dakota
Mid-flagged peers for Williams County
Cross-state counties nearest Williams County on flagged-system share (95.5%) and cumulative violation count (564). In-state neighbours stay on the compliance plate above.
Similar flagged-system rate
Nearest cross-state counties by % of SDWIS systems with at least one violation on record.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.