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Water quality

Ohio water quality

Ohio public water systems are regulated by the Ohio EPA and generally meet federal standards, but the state has several documented regional issues. According to state and federal agencies, harmful algal blooms in western Lake Erie threaten the drinking water of communities like Toledo, PFAS contamination is linked to industrial sites including the DuPont legacy in the Mid-Ohio Valley, and aging infrastructure in older cities can contribute lead.

Documented considerations

PFAS

PFAS has been detected near industrial and military sites in Ohio, and the long-running DuPont C8 (PFOA) legacy from the Parkersburg-area Washington Works plant contaminated Mid-Ohio Valley drinking water. DuPont, Chemours, and Corteva agreed to pay Ohio 110 million dollars in a 2023 PFAS settlement.

Nitrate and algal toxins

According to state agencies and the NRDC, phosphorus and nitrogen runoff fuels harmful algal blooms in western Lake Erie; in 2014 a bloom produced microcystin toxin that forced Toledo to issue a do-not-drink advisory for over 400,000 residents.

Lead

Aging infrastructure in older Ohio cities such as Cleveland and Cincinnati can leach lead from legacy pipes and service lines into tap water.

Hardness

Many Ohio communities relying on groundwater report moderately hard to hard water from limestone-rich aquifers. Hardness is an aesthetic and scale concern rather than a health hazard.

EPA compliance snapshot

From the EPA ECHO Safe Drinking Water Act database, Ohio community water systems carrying one or more violations on record:

664
systems with a violation on record
19
with a health-based violation
25
flagged serious violators

Most common violation categories

  • Revised Total Coliform Rule (274)
  • Consumer Confidence Rule (240)
  • Public Notice (232)
  • Lead and Copper Rule Revisions (73)
  • Nitrate (57)
  • Lead and Copper Rule (33)

Counts are public EPA ECHO figures. 'Health-based' means a system carries at least one health-based violation flag in ECHO. A violation on record is not a statement that current tap water is unsafe; most systems return to compliance. Always check your utility's Consumer Confidence Report for current status. Source: EPA ECHO, retrieved 2026-06-01.

Certified filters for Ohio's main concerns

FAQ

Is Lake Erie water safe to drink?
Communities drawing from western Lake Erie, like Toledo, treat their water to meet safety standards, but harmful algal blooms remain a documented seasonal risk. In 2014 a bloom's microcystin toxin caused a do-not-drink advisory for over 400,000 people, and utilities have since invested in advanced treatment and nutrient-reduction efforts.
Is there PFAS in Ohio drinking water?
PFAS has been detected near industrial and military sites in Ohio, and the DuPont C8 (PFOA) legacy contaminated Mid-Ohio Valley water for decades. A 2023 settlement with DuPont, Chemours, and Corteva directs 110 million dollars to Ohio, with funds supporting PFAS treatment and new water sources in affected areas.
Should I worry about lead in older Ohio cities?
Homes served by legacy lead pipes or plumbing in older Ohio cities can have elevated lead at the tap. Lead is especially harmful to children, so checking with your utility about your service-line material and using lead-certified filtration are sensible precautions.

Sources

  1. NRDC - Toledo's Blooming Algae Crisis
  2. Ohio Capital Journal - DuPont/Chemours/Corteva PFAS Settlement

Not sure how to read your local report? See our guide on reading a water quality report.