Franklin County, Ohio
75 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-03
For most households in Franklin County, the 75 tracked ZIP codes show adequate but uneven water quality.
How Franklin County Compares
How Franklin County Compares
Franklin County scores 1 points above the Ohio state average (60/100) and 7 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Franklin County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.3 (asthma 11.1%, diabetes 11.8%)
Estimated additional annual cost per homeowner: $1,219, driven primarily by flood
Infrastructure: 0.365% avg pipe failure probability, 41% of ZIPs at high risk
64.2% of homes built before 1978 (lead paint era)
Violation History (2022–2024)
→ Stable trendEPA violation counts by year across Franklin County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 55 violations. Past 5 years: 100 total (100 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,219
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
628,924 housing units in Franklin County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Franklin County
Remediation costs are relatively manageable for most homeowners in Franklin County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Franklin County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Franklin County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | COLUMBUS PUBLIC WATER SYSTEM | 1,305,946 | 323 |
| 2 | Mid-ohio Water Supply District Plain City Wtp | 4,467 | 315 |
| 3 | London City Public Water System | 10,256 | 315 |
| 4 | Sanitary District #4 | 8,575 | 315 |
| 5 | Mid-ohio Water Supply District Water District 1 | 5,176 | 315 |
33 total water systems serve Franklin County.
All ZIP Codes in Franklin County
75 ZIP codes tracked in Franklin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 43004 | Blacklick | 70 | B | 1 | $298K |
| 2 | 43016 | Dublin | 70 | B | 0 | $413K |
| 3 | 43110 | Canal Winchester | 70 | B | 0 | $284K |
| 4 | 43201 | Columbus | 68 | C | 7 (2 health) | $438K |
| 5 | 43205 | Columbus | 68 | C | 7 (2 health) | $291K |
| 6 | 43206 | Columbus | 68 | C | 7 (2 health) | $280K |
| 7 | 43211 | Columbus | 68 | C | 7 (2 health) | $92K |
| 8 | 43217 | Columbus | 68 | C | 7 (2 health) | — |
| 9 | 43218 | Columbus | 68 | C | 7 (2 health) | — |
| 10 | 43222 | Columbus | 68 | C | 7 (2 health) | $216K |
| 11 | 43231 | Columbus | 68 | C | 7 (2 health) | $223K |
| 12 | 43069 | Reynoldsburg | 66 | C | 0 | — |
| 13 | 43137 | Lockbourne | 66 | C | 2 (1 health) | $225K |
| 14 | 43195 | Groveport | 66 | C | 0 | — |
| 15 | 43198 | Groveport | 66 | C | 0 | — |
| 16 | 43199 | Groveport | 66 | C | 0 | — |
| 17 | 43017 | Dublin | 65 | C | 0 | $475K |
| 18 | 43086 | Westerville | 65 | C | 1 (1 health) | — |
| 19 | 43125 | Groveport | 65 | C | 0 | $233K |
| 20 | 43203 | Columbus | 64 | C | 7 (2 health) | $282K |
| 21 | 43210 | Columbus | 64 | C | 7 (2 health) | — |
| 22 | 43216 | Columbus | 64 | C | 7 (2 health) | — |
| 23 | 43226 | Columbus | 64 | C | 7 (2 health) | — |
| 24 | 43234 | Columbus | 64 | C | 7 (2 health) | — |
| 25 | 43236 | Columbus | 64 | C | 7 (2 health) | — |
| 26 | 43251 | Columbus | 64 | C | 7 (2 health) | — |
| 27 | 43260 | Columbus | 64 | C | 7 (2 health) | — |
| 28 | 43266 | Columbus | 64 | C | 7 (2 health) | — |
| 29 | 43268 | Columbus | 64 | C | 7 (2 health) | — |
| 30 | 43270 | Columbus | 64 | C | 7 (2 health) | — |
| 31 | 43271 | Columbus | 64 | C | 7 (2 health) | — |
| 32 | 43272 | Columbus | 64 | C | 7 (2 health) | — |
| 33 | 43279 | Columbus | 64 | C | 7 (2 health) | — |
| 34 | 43287 | Columbus | 64 | C | 7 (2 health) | — |
| 35 | 43291 | Columbus | 64 | C | 7 (2 health) | — |
| 36 | 43299 | Columbus | 64 | C | 7 (2 health) | — |
| 37 | 43202 | Columbus | 63 | C | 7 (2 health) | $317K |
| 38 | 43204 | Columbus | 63 | C | 7 (2 health) | $171K |
| 39 | 43207 | Columbus | 63 | C | 7 (2 health) | $156K |
| 40 | 43212 | Columbus | 63 | C | 7 (2 health) | $515K |
| 41 | 43215 | Columbus | 63 | C | 7 (2 health) | $508K |
| 42 | 43219 | Columbus | 63 | C | 7 (2 health) | $174K |
| 43 | 43220 | Columbus | 63 | C | 7 (2 health) | $463K |
| 44 | 43221 | Columbus | 63 | C | 7 (2 health) | $419K |
| 45 | 43224 | Columbus | 63 | C | 7 (2 health) | $160K |
| 46 | 43228 | Columbus | 63 | C | 7 (2 health) | $204K |
| 47 | 43229 | Columbus | 63 | C | 7 (2 health) | $211K |
| 48 | 43235 | Columbus | 63 | C | 7 (2 health) | $347K |
| 49 | 43194 | Lockbourne | 61 | C | 2 (1 health) | — |
| 50 | 43068 | Reynoldsburg | 60 | C | 0 | $226K |
| 51 | 43081 | Westerville | 59 | C | 1 (1 health) | $297K |
| 52 | 43085 | Columbus | 58 | C | 7 (2 health) | $373K |
| 53 | 43209 | Columbus | 58 | C | 7 (2 health) | $374K |
| 54 | 43213 | Columbus | 58 | C | 7 (2 health) | $198K |
| 55 | 43214 | Columbus | 58 | C | 7 (2 health) | $371K |
| 56 | 43223 | Columbus | 58 | C | 7 (2 health) | $114K |
| 57 | 43227 | Columbus | 58 | C | 7 (2 health) | $134K |
| 58 | 43230 | Columbus | 58 | C | 7 (2 health) | $283K |
| 59 | 43232 | Columbus | 58 | C | 7 (2 health) | $153K |
| 60 | 43002 | Amlin | 53 | D | 0 | $300K |
| 61 | 43021 | Galena | 53 | D | 0 | $525K |
| 62 | 43026 | Hilliard | 53 | D | 0 | $324K |
| 63 | 43033 | Kirkersville | 53 | D | 0 | $158K |
| 64 | 43054 | New Albany | 53 | D | 0 | $483K |
| 65 | 43074 | Sunbury | 53 | D | 0 | $397K |
| 66 | 43109 | Brice | 53 | D | 0 | $238K |
| 67 | 43123 | Grove City | 53 | D | 4 (1 health) | $262K |
| 68 | 43126 | Harrisburg | 53 | D | 0 | $165K |
| 69 | 43064 | Plain City | 45 | D | 0 | $419K |
| 70 | 43065 | Powell | 45 | D | 0 | $452K |
| 71 | 43119 | Galloway | 45 | D | 0 | $236K |
| 72 | 43018 | Etna | 40 | D | 0 | — |
| 73 | 43073 | Summit Station | 40 | D | 0 | — |
| 74 | 43721 | Brownsville | 40 | D | 0 | $65K |
| 75 | 43740 | Gratiot | 40 | D | 0 | $123K |
Recommended Buyer Guides for Franklin County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 64.2% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Franklin County, Ohio
Overview
Franklin County in Ohio covers 75 ZIP codes with an average Home Safety Score of C (61/100).
51 of 75 ZIP codes have recorded EPA violations. 95 health-based violations have been documented.
← Back to Ohio water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.