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Counties → Ohio

Franklin County, Ohio

SDWIS compliance plate

Sheet OH049 · Franklin County 96 sys · 5,342 viol · #32/3254

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

  • VIOL-SEVERE 83.3% flagged
  • HEALTH-MID 22.2% health
  • RANK-TOP #32/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-MID 38.5% detect
  • SRC-GW GW lead 84%
  • SYS-MID 96 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Franklin County ranks #32 of 3,254 counties by people served, and #1 of 88 counties in Ohio. See methodology · corpus placement.

Franklin County standing, lower-flagged corpus third

Flagged-system rate 83.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 22.2% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 38.5% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #32 of 3,254 · #1 of 88 in Ohio.

Flagged-rate neighbourhood around Franklin County

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

0% 20% 40% 60% 80% 100% Fayette · lowest Paulding · near Fulton · near Vinton · highest 78.6% 82.1% 82.8% 83.3% 83.3% 84.7% 100%

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

Water Systems

System Name Population Violations PFAS
Columbus Public Water System 1,305,946 33 Detected
Westerville City PWS 39,000 32 Detected
Reynoldsburg City PWS 37,847 5 Detected
Gahanna City PWS 33,258 37 Clean
Bexley City PWS 14,250 15 Detected
Jefferson Water and Sewer District PWS 11,294 123 Clean
Canal Winchester City PWS 9,286 3 Clean
Sanitary District #4 8,575 40 Detected
Aqua Ohio - Blacklick 7,100 19 Clean
Aqua Ohio - Huber Ridge PWS 6,950 24 Clean
Aqua Ohio - Lake Darby 3,562 4 Clean
Groveport PWS 3,229 149 Clean
Obetz Village PWS 3,167 24 -
Aqua Ohio - Worthington Hills PWS 2,500 0 -
Timberlake Water System 1,600 201 Clean
Obetz Satellite 6 PWS 1,317 16 -
Obetz Satellite 2 PWS 1,267 11 -
Mount Carmel Grove City 1,000 0 -
Aqua Ohio - Timberbrook Pw 865 2 -
Turn Point Apostolic Church PWS 800 113 -
Enchanted Acres MHP 750 53 -
Cedar Ridge Lodge Area PWS 600 76 -
Oak Hills Mobile Home Park 505 65 -
Movement Church of Columbus 400 0 -
Covenant Church 400 0 -
Darbydale Elementary School PWS 370 12 -
Grace Evangelical Church 311 87 -
Lockbourne Village PWS 275 48 -
Leonard Park PWS 266 4 -
Great Beginnings Academy 236 238 -
Pleasant Acres MHP 217 169 -
Ponderosa Estates MHP 216 324 -
Dollar General #17176 - Grove City 203 0 -
Obetz Satellite 3 PWS 200 2 -
Makoy Center, Inc. 200 55 -
Southeast Conservation Club - Campground 200 23 -
Hayden Heights MHP 188 395 -
Country Side Mobile Home 180 725 -
The Darby House 180 95 -
Groveport Municipal Golf Course PWS 175 41 -
Obetz Satellite 4 PWS 175 2 -
Sutphen Corporation 160 46 -
Creekside Church 155 35 -
Obetz Satellite 1 PWS 151 18 -
By Way Mobile Home Park 150 74 -
Homestead Springs Golf Course 150 8 -
Sunoco Food Mart 7563 PWS 150 24 -
Brobst Memorial Park PWS 150 15 -
Darby Nature Center PWS 150 0 -
Circle S Farms PWS 150 23 -

Compare beyond Ohio

Lower-flagged peers for Franklin County

Cross-state counties nearest Franklin County on flagged-system share (83.3%) and cumulative violation count (5,342). 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.