Jefferson County, Montana
SDWIS compliance plate
Sheet MT043 · Jefferson County 42 sys · 6,871 viol · #2347/3254
VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · BELOW-PEER · PFAS-NONE · SRC-GW · SYS-MID · BOOK-MOST
- VIOL-SEVERE 97.6% flagged
- HEALTH-LOW 18.8% health
- RANK-LOWER #2347/3254
- BELOW-PEER 1.3 pp cleaner
- PFAS-NONE No UCMR5 set
- SRC-GW GW lead 95%
- SYS-MID 42 systems
- BOOK-MOST 6/7 fields
Nearest flagged-rate peer: Lincoln County (+ 1.3 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Jefferson County ranks #2,347 of 3,254 counties by people served, and #20 of 56 counties in Montana. See methodology · corpus placement.
Jefferson County standing, mid-flagged corpus third
Flagged-system rate 97.6% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 18.8% is health-based share in the middle third (≤ 24.5%) . No UCMR5 tests in this extract for Jefferson County . Population served ranks #2,347 of 3,254 · #20 of 56 in Montana.
Flagged-rate neighbourhood around Jefferson County
Lowest/highest poles plus in-state counties nearest Jefferson County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Montana
Mid-flagged peers for Jefferson County
Cross-state counties nearest Jefferson County on flagged-system share (97.6%) and cumulative violation count (6,871). 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.