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County profile · EPA SDWIS + UCMR5

Glacier County, Montana

27 SDWIS-listed public water systems serve 10,757 people in Glacier County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.

27
SDWIS water systems Middle third of counties
3,989
Total violations Upper third of counties
88.9%
SDWIS systems w/ a violation Lower third of counties
-
UCMR5 PFAS (none tested) No UCMR5 tests

SDWIS compliance plate

Sheet MT035 · Glacier County 27 sys · 3,989 viol · #2293/3254

VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · PHOTO-FINISH · PFAS-NONE · SRC-GW · SYS-SMALL · BOOK-MOST

  • VIOL-SEVERE 88.9% flagged
  • HEALTH-LOW 4.9% health
  • RANK-LOWER #2293/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 74%
  • SYS-SMALL 27 systems
  • BOOK-MOST 6/7 fields

Nearest flagged-rate peer: Toole County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Glacier County ranks #2,293 of 3,254 counties by people served, and #16 of 56 counties in Montana. See methodology · corpus placement.

Glacier County standing, lower-flagged corpus third

Flagged-system rate 88.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 4.9% is health-based share at or below the lower third (≤ 10.3%) . No UCMR5 tests in this extract for Glacier County . Population served ranks #2,293 of 3,254 · #16 of 56 in Montana.

Flagged-rate neighbourhood around Glacier County

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

0% 20% 40% 60% 80% 100% Powder River · lowest Sanders · near Toole · near Petroleum · highest 66.7% 87.5% 88.6% 88.9% 88.9% 91.3% 100%

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

Water Systems

Compare beyond Montana

Lower-flagged peers for Glacier County

Cross-state counties nearest Glacier County on flagged-system share (88.9%) and cumulative violation count (3,989). 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. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.