Is Toledo, OH Tap Water Safe to Drink?

Where Does Toledo Get Its Water?

Toledo's drinking water is supplied by the City of Toledo's water system, which draws from Lake Erie, one of the Great Lakes. Lake Erie is a surface water source shared by a large region of the Midwest and subject to seasonal algae blooms and runoff, which is one reason Toledo's treatment process is fairly involved.

The city operates a treatment plant that processes Lake Erie water before it reaches your tap. The aggregate data references a single treatment facility serving the system's 31 ZIP codes.

How Is Toledo Tap Water Treated?

Toledo's water goes through a multi-step treatment process. The system uses softening to reduce hardness, along with filtration to remove particulates and other contaminants before the water moves to disinfection.

For disinfection, the system uses a combination of ozone, free chlorine, and a membrane-based step. Ozone is applied early in the process to break down organic compounds and help control taste and odor. Free chlorine is added to maintain a residual disinfectant as water travels through the distribution pipes to your home.

Ozone treatment is particularly relevant in Toledo's context because it can help address byproducts from algal blooms in Lake Erie. This layered approach is designed to handle the variable source water quality that comes with a large, open freshwater lake.

What's in Toledo Tap Water?

The most notable finding from recent EPA testing is lithium, detected at up to 9 micrograms per liter across all 31 sampled ZIP codes. There is currently no enforceable federal maximum contaminant level for lithium in drinking water. The detected level is at the reporting limit, meaning the actual concentration may be at or below that threshold.

Several PFAS compounds were also detected at trace levels. PFTrDA was found at up to 0.007 micrograms per liter, and three others, including HFPO-DA (sometimes called GenX) and PFBA, each reached up to 0.005 micrograms per liter. All of these values are at or below their respective reporting limits, and none exceeded an enforceable federal standard based on available data.

PFAS are a broad class of synthetic chemicals used historically in industrial processes, firefighting foam, and consumer products. They can enter source water through industrial discharge and runoff. Their detection in Lake Erie-sourced systems is consistent with national patterns documented by EPA monitoring programs.

Health Risk Profile for Toledo

For most adults, the contaminant levels detected in Toledo's water do not exceed any enforceable federal drinking-water standard. The lithium reading of 9 micrograms per liter is at the detection reporting threshold and is not tied to a legal limit. The PFAS compounds detected are at trace levels at or below their reporting limits, and none triggered a regulatory exceedance in the available data.

Sensitive groups, including infants, pregnant individuals, and people with compromised immune systems, may face greater concern from PFAS exposure even at low concentrations. EPA has set enforceable limits for some PFAS compounds (like PFOA and PFOS) at 4 parts per trillion, though those specific compounds were not listed among Toledo's top detected contaminants. If you are in a sensitive group, consulting a healthcare provider about your individual risk is a reasonable step.

Given that PFAS compounds were detected, a filter certified to NSF/ANSI 58 (reverse osmosis) or NSF/ANSI P473 is the most effective option for reducing PFAS at the tap. NSF/ANSI is an independent third-party certification program, so look for that label on the box when shopping. These certifications confirm the filter has been tested to reduce the specific contaminants listed.

The science on some PFAS compounds, including several detected here, is still evolving and EPA has not yet set enforceable limits for all of them. Detected levels at or near reporting limits mean the true concentration could be very low or essentially undetectable. A filter provides an extra layer of precaution if you want one.