PlainWater

Cass County, Missouri

SDWIS compliance plate

Sheet MO037 · Cass County 31 sys · 1,771 viol · #111/3254

VIOL-SEVERE · HEALTH-HIGH · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-SW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 100.0% flagged
  • HEALTH-HIGH 54.2% health
  • RANK-TOP #111/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-HIGH 66.7% detect
  • SRC-SW SW lead 74%
  • SYS-SMALL 31 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Cass County ranks #111 of 3,254 counties by people served, and #2 of 115 counties in Missouri. See methodology · corpus placement.

Cass 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 54.2% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 66.7% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #111 of 3,254 · #2 of 115 in Missouri.

Flagged-rate neighbourhood around Cass County

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

0% 20% 40% 60% 80% 100% Shannon · lowest Mercer · highest St. Louis city · near Clay · 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
Kansas City PWS 513,800 23 Detected
Belton PWS 23,598 32 Detected
Raymore PWS 21,517 33 Clean
Harrisonville PWS 10,019 86 Clean
Pleasant Hill PWS 8,262 71 Detected
Peculiar PWS 6,226 30 Detected
Cass County PWSD 9 6,063 11 Clean
Cass County PWSD 2 4,650 22 Detected
Cass County PWSD 7 4,143 5 Detected
Cass County PWSD 10 3,068 19 -
Cass County PWSD 5 2,875 44 -
Cass County PWSD 3 2,760 17 -
Cass County PWSD 6 2,575 33 -
Cass County PWSD 11 1,948 6 -
Cass County PWSD 4 1,840 9 -
Lake Winnebago PWS 1,600 29 -
MO American Garden City 1,590 414 -
Springdale Lake Estates 1,500 25 -
Archie PWS 1,300 252 -
Drexel PWS 965 142 -
NW Cass County Water Resource District 938 16 -
Southfork MHP 795 32 -
Cass County PWSD 1 723 14 -
Cleveland PWS 690 96 -
Freeman PWS 482 55 -
East Lynne PWS 400 33 -
Creighton PWS 349 156 -
Meadow View Mhc LLC 320 5 -
Crown MHP 300 3 -
Pickering Place 250 9 -
Cass County PWSD 8 198 49 -

Compare beyond Missouri

Mid-flagged peers for Cass County

Cross-state counties nearest Cass County on flagged-system share (100.0%) and cumulative violation count (1,771). 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.

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.