Jefferson County, Missouri
SDWIS compliance plate
Sheet MO099 · Jefferson County 99 sys · 6,751 viol · #355/3254
VIOL-SEVERE · HEALTH-MID · RANK-TOP · BELOW-PEER · PFAS-MID · SRC-GW · SYS-MID · BOOK-FULL
- VIOL-SEVERE 99.0% flagged
- HEALTH-MID 20.1% health
- RANK-TOP #355/3254
- BELOW-PEER 1.0 pp cleaner
- PFAS-MID 28.6% detect
- SRC-GW GW lead 86%
- SYS-MID 99 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Cass County (+ 1 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Jefferson County ranks #355 of 3,254 counties by people served, and #8 of 115 counties in Missouri. See methodology · corpus placement.
Jefferson County standing, mid-flagged corpus third
Flagged-system rate 99.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 20.1% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 28.6% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #355 of 3,254 · #8 of 115 in Missouri.
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 Missouri
Mid-flagged peers for Jefferson County
Cross-state counties nearest Jefferson County on flagged-system share (99.0%) and cumulative violation count (6,751). 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.