Ohio lawmakers question proposed Ohio EPA wastewater permit for data centers and Lake Erie protections

Proposal would change how some data centers receive permission to discharge cooling wastewater

Ohio lawmakers are raising concerns about a proposed statewide wastewater discharge permit that could allow certain data centers to release cooling-related wastewater into lakes, rivers and streams, including waterways that flow to Lake Erie. The proposal under review would create a general permit pathway for data centers that do not connect to municipal sewer systems, shifting approvals from individualized permits toward a more standardized process for qualifying facilities.

The permitting question arrives as Ohio continues to attract large-scale data center development, which can require significant water for cooling depending on design. The proposed framework is intended to streamline permitting for discharges that state regulators consider similar in type and impact, while still setting conditions for what can be released and where.

What the draft general permit would do

Under the proposed approach, eligible data centers would seek coverage under a general National Pollutant Discharge Elimination System permit rather than going through a full, site-specific permit review for each project. Facilities would file a notice of intent before discharging wastewater that may contain pollutants associated with industrial cooling systems, such as corrosion inhibitors and metals.

• The draft permit is designed as an expedited process compared with individual permitting.
• It includes exclusions for certain discharge locations, including restrictions related to proximity upstream of surface water intakes used for public drinking water.
• The proposal includes an explicit acknowledgement that authorizing discharges under the permit could result in lower water quality in some state waters as part of accommodating economic development.

Why Lake Erie is central to the debate

Lake Erie supplies drinking water for millions of people and remains vulnerable to pollution-driven problems, including harmful algal blooms fueled by nutrient loading. Lawmakers and environmental advocates argue that any permitting change affecting discharges into tributaries or nearshore areas should be evaluated through a site-specific lens, particularly in watersheds with existing impairment or heavy recreational and drinking-water reliance.

At issue is whether a one-size-fits-all permit can accurately account for differences in a facility’s size, cooling technology, wastewater volume, chemical additives and the sensitivity of the receiving stream or lakefront area.

Chemical and oversight questions

A key point raised by critics is whether the proposed general permit sufficiently addresses emerging contaminants and the monitoring needed to detect harm early. Some lawmakers have highlighted the risk of wastewater containing PFAS, a class of long-lasting chemicals that have drawn increasing regulatory scrutiny nationwide. Opponents also argue that without robust baseline testing and site-specific limits, a general permit could make it harder to identify cumulative effects when multiple facilities discharge within the same watershed.

Timeline and what happens next

The public comment period for the draft permit was extended and is scheduled to close at 5 p.m. Jan. 16, 2026. After reviewing written comments and input from public hearings, Ohio EPA is expected to issue a formal response to comments before the agency director takes final action on whether to adopt, modify or withdraw the proposed general permit.

For lawmakers focused on Lake Erie, the decision is likely to shape not only how quickly projects move through approvals, but also how Ohio balances accelerated industrial growth with long-standing commitments to protect drinking-water sources and sensitive Great Lakes tributaries.