PlainWater

Harrison County, Missouri

SDWIS compliance plate

Sheet MO081 · Harrison County 8 sys · 511 viol · #2190/3254

VIOL-SEVERE · HEALTH-HIGH · RANK-LOWER · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-TINY · BOOK-FULL

  • VIOL-SEVERE 100.0% flagged
  • HEALTH-HIGH 50.3% health
  • RANK-LOWER #2190/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 75%
  • SYS-TINY 8 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Harrison County ranks #2,190 of 3,254 counties by people served, and #67 of 115 counties in Missouri. See methodology · corpus placement.

Harrison 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 50.3% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #2,190 of 3,254 · #67 of 115 in Missouri.

Flagged-rate neighbourhood around Harrison County

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

0% 20% 40% 60% 80% 100% Shannon · lowest Mercer · highest Jackson · near Boone · near 69.6% 100% 100% 100% 100% 100% 100%

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

Water Systems

System Name Population Violations PFAS
Harrison County PWSD 2 3,740 56 Clean
Bethany PWS 3,292 66 -
Mercer County PWSD 1 3,200 44 Detected
Harrison County PWSD 1 823 166 -
Gilman City PWS 387 84 -
Ridgeway PWS 372 19 -
Cainsville PWS 290 44 -
New Hampton PWS 283 32 -

Compare beyond Missouri

Mid-flagged peers for Harrison County

Cross-state counties nearest Harrison County on flagged-system share (100.0%) and cumulative violation count (511). 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. 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.