PlainWater

Mahnomen County, Minnesota

SDWIS compliance plate

Sheet MN087 · Mahnomen County 18 sys · 98 viol · #2953/3254

VIOL-MID · HEALTH-LOW · RANK-BOTTOM · BELOW-PEER · PFAS-NONE · SRC-GW · SYS-SMALL · BOOK-MOST

  • VIOL-MID 22.2% flagged
  • HEALTH-LOW 7.1% health
  • RANK-BOTTOM #2953/3254
  • BELOW-PEER 10.2 pp cleaner
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 100%
  • SYS-SMALL 18 systems
  • BOOK-MOST 6/7 fields

Nearest flagged-rate peer: Isanti County (+ 10.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Mahnomen County ranks #2,953 of 3,254 counties by people served, and #85 of 87 counties in Minnesota. See methodology · corpus placement.

Mahnomen County standing, lower-flagged corpus third

Flagged-system rate 22.2% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 7.1% is health-based share at or below the lower third (≤ 10.3%) . No UCMR5 tests in this extract for Mahnomen County . Population served ranks #2,953 of 3,254 · #85 of 87 in Minnesota.

Flagged-rate neighbourhood around Mahnomen County

Lowest/highest poles plus in-state counties nearest Mahnomen County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Mahnomen · this county · lowest Hubbard · near 22.2% 32.4% 33.3% 34.7% 34.8% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

Compare beyond Minnesota

Lower-flagged peers for Mahnomen County

Cross-state counties nearest Mahnomen County on flagged-system share (22.2%) and cumulative violation count (98). 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.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers
Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.