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Counties → Ohio

Marion County, Ohio

SDWIS compliance plate

Sheet OH101 · Marion County 33 sys · 1,445 viol · #925/3254

VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 81.8% flagged
  • HEALTH-LOW 19.8% health
  • RANK-UPPER #925/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 97%
  • SYS-SMALL 33 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Marion County ranks #925 of 3,254 counties by people served, and #42 of 88 counties in Ohio. See methodology · corpus placement.

Marion County standing, lower-flagged corpus third

Flagged-system rate 81.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 19.8% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #925 of 3,254 · #42 of 88 in Ohio.

Flagged-rate neighbourhood around Marion County

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

0% 20% 40% 60% 80% 100% Fayette · lowest Butler · near Paulding · near Vinton · highest 78.6% 81.8% 81.8% 82.1% 82.8% 83.3% 100%

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

Water Systems

System Name Population Violations PFAS
Aqua Ohio - Marion 46,317 20 Clean
Elgin Local Schools 1,321 0 -
Aqua Ohio - la Rue Village 800 105 -
Ridgedale JR/SR High School 465 29 -
Ridgedale Elementary School 361 21 -
Cornerstone Alliance Church 350 4 -
Marion Sunoco 250 8 -
Oakridge Estates 230 122 -
Dollar General Store - Prospect #19559 220 0 -
Dollar General - New Bloomington #25498 217 0 -
Raceway Mini Mart 200 60 -
Rise Christian Church 180 32 -
Grace Baptist Church 175 21 -
Dairy Bar of Green Camp 165 12 -
Pleasant Acres Mobile Home Community LLC 158 69 -
Hickory Grove Lake Campground 130 32 -
New White Swan Restaurant 125 47 -
Berwick Pizza 75 58 -
Timothy Lutheran Church 75 73 -
VFW Post 7201- Stephen J Chaney 75 15 -
Green Camp Pit Stop 75 0 -
Calvary Bible Baptist Church 70 41 -
Washburn Browne Park 60 82 -
Elgin High School - Gym 50 176 -
Enterprise Baptist Church 50 180 -
Grand Prairie Farm Market 50 34 -
Al's Country Market PWS 46 0 -
New Vision Fire and Rescue 45 53 -
Cruiser's Pizza Subs and Suds 40 24 -
Oak Knoll Baptist Church 35 39 -
Bloom Medicinals 30 0 -
Green Camp Methodist Church 25 25 -
Mary's Dairy Bar 25 63 -

Compare beyond Ohio

Lower-flagged peers for Marion County

Cross-state counties nearest Marion County on flagged-system share (81.8%) and cumulative violation count (1,445). 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.