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Counties → Missouri

Washington County, Missouri

SDWIS compliance plate

Sheet MO221 · Washington County 39 sys · 3,278 viol · #2442/3254

VIOL-SEVERE · HEALTH-MID · RANK-LOWER · PHOTO-FINISH · PFAS-NONE · SRC-GW · SYS-SMALL · BOOK-MOST

  • VIOL-SEVERE 97.4% flagged
  • HEALTH-MID 39.5% health
  • RANK-LOWER #2442/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 100%
  • SYS-SMALL 39 systems
  • BOOK-MOST 6/7 fields

Nearest flagged-rate peer: Lawrence County ( -0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Washington County ranks #2,442 of 3,254 counties by people served, and #77 of 115 counties in Missouri. See methodology · corpus placement.

Washington County standing, mid-flagged corpus third

Flagged-system rate 97.4% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 39.5% is health-based share above the upper third (> 24.5%) . No UCMR5 tests in this extract for Washington County . Population served ranks #2,442 of 3,254 · #77 of 115 in Missouri.

Flagged-rate neighbourhood around Washington County

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

0% 20% 40% 60% 80% 100% Shannon · lowest Lawrence · near St. Francois · near Mercer · highest 69.6% 96.7% 97.2% 97.4% 97.7% 97.9% 100%

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

Water Systems

System Name Population Violations PFAS
Potosi PWS 2,527 468 -
Kingston K 14 School Primary 975 9 -
Potosi East 900 87 -
YMCA Trout Lodge & Camp Lakewood 800 96 -
Washington County PWSD 1 503 201 -
Irondale PWS 420 34 -
MO American Rogue Creek Utilities 276 244 -
Mineral Point PWS 231 332 -
Anthonies Mill Resort Subdivision 214 279 -
Richwoods Elementary School 200 26 -
Washington County PWSD 2 175 10 -
St Joachim Church and School 150 60 -
Caledonia PWS 130 83 -
Twin Eagles Lake RV and Hideout 130 16 -
Washington State Park Office 125 77 -
Washington State Park Campground 125 4 -
Starlite Drive in Theatre 100 218 -
Bates Creek Baptist Camp 100 135 -
YMCA Ozarks East Camp 100 58 -
Roys Number One 100 55 -
B and M Quickstop 100 14 -
Fourche Valley Golf Club 50 225 -
Bri Co Inc 50 145 -
Dollar General #19381 Richwoods 50 5 -
Saucys Pizzeria 45 29 -
Reed Lumber Company LLC 45 42 -
Little Learners Academy 37 102 -
Buckman North America Cadet Plant 35 50 -
Spring Lake Subdivision 25 1 -
The Legacy Ranch 25 7 -
Potosi R III Schools Ballfield Complex 25 1 -
Backwoods Convenience Bar and Grill 25 50 -
Spring Lake Ranch 25 8 -
YMCA of the Ozarks Sunnen Recreation 25 0 -
Washington County Knights of Columbus 25 88 -
Dollar General #15600 Washington County 25 8 -
Dollar General #22907 Old Mines 25 1 -
Quick Stop Convenience Store 25 4 -
Doe Run Company Viburnum 29 6 6 -

Compare beyond Missouri

Mid-flagged peers for Washington County

Cross-state counties nearest Washington County on flagged-system share (97.4%) and cumulative violation count (3,278). 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

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

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.