STATE REPORT OH 5 ALERTS 39 HEALTH VIOLATIONS

Ohio Water Quality & Safety Report

45 ZIP codes · 140 water systems · IPC plumbing code · Updated 2026-03-16

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16

45
ZIP Codes
140
Water Systems
34
ZIPs with Violations
5
Active Alerts
IPC
Plumbing Code

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 45 ZIP codes across Ohio, covering 140 community water systems that serve approximately 5,543,332 people.

34 of 45 ZIP codes (76%) have recorded EPA violations. 39 health-based violations have been documented.

Active Weather Alerts

5 active alerts in Ohio including 4 warnings. Severe weather can directly affect tap water quality — flooding, power outages, and infrastructure damage may lead to boil-water advisories.

AlertSeverityAreas
Flood WarningSevereAllen, IN; De Kalb, IN; Defiance, OH
Severe Thunderstorm WarningSevereBoyd, KY; Carter, KY; Greenup, KY; Lawrence, KY; Lawrence…
Severe Thunderstorm WarningSevereLorain, OH
Winter Storm WatchSevereCuyahoga; Geauga
Flood WarningSevereDefiance, OH; Fulton, OH; Williams, OH

View all Ohio alerts →

Plumbing Regulations

Ohio follows the Ohio Plumbing Code (based on IPC) (2017 edition).

  • Plumbing code: IPC (2017)
  • Homeowner DIY: Allowed with permit
  • Water heater permit: Required
  • Annual backflow test: Required

Full Ohio regulations →

Areas with Most Violations

ZIP CodeCitySafety ScoreViolationsHealth-BasedSystem
45801Lima—305LIMA CITY
43952Steubenville—274STEUBENVILLE, CITY OF
43551Perrysburg—190VILLAGE GREEN MHP
44481Warren—160WARREN CITY PWS
44701Canton—150CANTON PUBLIC WATER SYSTEM
43085Columbus—145COLUMBUS PUBLIC WATER SYSTEM
45011Hamilton—130BUTLER CO. WATER DISTRICT 2 PWS
43601Toledo—114TOLEDO CITY OF
44221Cuyahoga Falls—111CUYAHOGA FALLS CITY PWS
44901Mansfield—117MANSFIELD CITY

Areas with No Violations

ZIP CodeCitySafety ScoreSystemPopulation
43016Dublin—PONDEROSA ESTATES MHP216
43025Hebron—HEBRON VILLAGE PWS2,368
43040Marysville—MARYSVILLE CITY PWS25,571
43055Newark—NEWARK CITY PWS49,934
43068Reynoldsburg—REYNOLDSBURG CITY PWS37,847
43125Groveport—GROVEPORT PWS3,229
43616Oregon—OREGON CITY19,950
44136Strongsville—EDGEWOOD ESTATES96
44281Wadsworth—WADSWORTH CITY PWS24,356
44870Sandusky—SANDUSKY CITY25,793

Lead & Copper

  • 0 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 0 ZIP codes (0%)
  • Moderate risk (Zone 2): 0 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

All 45 ZIP Codes in Ohio

Data Sources

Updated daily.

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