Madison County, Montana
SDWIS compliance plate
Sheet MT057 · Madison County 45 sys · 4,771 viol · #2052/3254
VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL
- VIOL-SEVERE 100.0% flagged
- HEALTH-LOW 5.1% health
- RANK-LOWER #2052/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 100.0% detect
- SRC-GW GW lead 100%
- SYS-MID 45 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Silver Bow County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Madison County ranks #2,052 of 3,254 counties by people served, and #14 of 56 counties in Montana. See methodology · corpus placement.
Madison County standing, mid-flagged corpus third
Flagged-system rate 100.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 5.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #2,052 of 3,254 · #14 of 56 in Montana.
Flagged-rate neighbourhood around Madison County
Lowest/highest poles plus in-state counties nearest Madison County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Montana
Mid-flagged peers for Madison County
Cross-state counties nearest Madison County on flagged-system share (100.0%) and cumulative violation count (4,771). 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. 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.