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Counties → Ohio

Mercer County, Ohio

SDWIS compliance plate

Sheet OH107 · Mercer County 77 sys · 3,474 viol · #1357/3254

VIOL-SEVERE · HEALTH-LOW · RANK-MID · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 89.6% flagged
  • HEALTH-LOW 18.6% health
  • RANK-MID #1357/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 99%
  • SYS-MID 77 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Mercer County ranks #1,357 of 3,254 counties by people served, and #60 of 88 counties in Ohio. See methodology · corpus placement.

Mercer County standing, lower-flagged corpus third

Flagged-system rate 89.6% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 18.6% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,357 of 3,254 · #60 of 88 in Ohio.

Flagged-rate neighbourhood around Mercer County

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

0% 20% 40% 60% 80% 100% Fayette · lowest Carroll · near Mercer · this county Vinton · highest 78.6% 89.3% 89.5% 89.5% 89.6% 89.6% 100%

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

Water Systems

System Name Population Violations PFAS
Celina City 11,682 451 Detected
Coldwater Village 4,774 309 Clean
St Henry Village 2,596 85 -
Ft Recovery Village 1,501 94 -
Rockford Village 1,120 157 -
Mendon Village 628 19 -
Motor Inn Auto Truck Stop PWS 486 8 -
Chickasaw Village 358 34 -
Christ Chapel Church - Fort Recovery 354 0 -
Pax Machine Works 255 183 -
Buoys Bar & Grill 230 75 -
Fort Recovery Industries 220 39 -
Knights of Saint John 220 7 -
Lake Shore Resort 208 18 -
Zuma Thru/Sunset Laundry/Car Wash 208 46 -
Starlight Drive in Theater 200 33 -
Mt Tabor Church of God-Celina PWS 200 1 -
Hechts Landing - Campground I 195 7 -
Tsc Store 240 184 43 -
Gilbert Station Bar and Grill 175 48 -
Mercer Co Elks Club 2170 175 29 -
Behms Landing Restaurant 175 22 -
St Anthony Catholic Church 175 0 -
St. Teresa Catholic Church 170 8 -
St. Henry's Stop and Go 165 18 -
Kozy Kamp Ground 156 0 -
Dollar General Store - Celina #16694 150 0 -
Marion Township Park PWS 150 0 -
Saint Charles Center 142 91 -
Hechts Landing - Campground III 131 11 -
Lakeside Hideout 130 3 -
Duckfoot-Arnold Landing PWS 128 29 -
American Legion Post 345 127 11 -
Park Grand Resort 126 15 -
Hechts Landing - MHP 122 9 -
Korner Kafe - Maria Stein 120 25 -
Northmoor Golf LLC 107 24 -
Grand Lake Estates 103 263 -
Bayview Sun and Snow 102 19 -
VFW Post 5135 100 49 -
Cooper Farms Central Egg Processing 95 64 -
Hechts Landing - Campground II 86 0 -
Moeller Brew Barn 85 22 -
Streter's Chatt Bar 76 56 -
Shingle Shack Restaurant 75 0 -
Wendelin 2.0 75 63 -
Its It Landing 71 15 -
Wagon Wheel Nite Club 70 62 -
IN-Oh's Stateline Bar & Grill 62 28 -
Cottonwood Park 60 8 -

Compare beyond Ohio

Lower-flagged peers for Mercer County

Cross-state counties nearest Mercer County on flagged-system share (89.6%) and cumulative violation count (3,474). 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.