County profile · EPA SDWIS + UCMR5
Ravalli County, Montana
129 SDWIS-listed public water systems serve 30,657 people in Ravalli County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 129
- SDWIS water systems Larger third of counties
- 9,816
- Total violations Upper third of counties
- 93.0%
- SDWIS systems w/ a violation Middle third of counties
- 50.0%
- UCMR5 PFAS rate (2 tested) Upper third of counties with tests
SDWIS compliance plate
Sheet MT081 · Ravalli County 129 sys · 9,816 viol · #1349/3254
VIOL-SEVERE · HEALTH-LOW · RANK-MID · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-LARGE · BOOK-FULL
- VIOL-SEVERE 93.0% flagged
- HEALTH-LOW 13.4% health
- RANK-MID #1349/3254
- PHOTO-FINISH ±0.1 pp
- PFAS-HIGH 50.0% detect
- SRC-GW GW lead 99%
- SYS-LARGE 129 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Yellowstone County (+ 0.1 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Ravalli County ranks #1,349 of 3,254 counties by people served, and #8 of 56 counties in Montana. See methodology · corpus placement.
Ravalli County standing, mid-flagged corpus third
Flagged-system rate 93.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 13.4% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,349 of 3,254 · #8 of 56 in Montana.
Flagged-rate neighbourhood around Ravalli County
Lowest/highest poles plus in-state counties nearest Ravalli County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Montana
Mid-flagged peers for Ravalli County
Cross-state counties nearest Ravalli County on flagged-system share (93.0%) and cumulative violation count (9,816). 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.