August 2026 · Orevant Compliance Intelligence
More than 4,000 public water systems operate in Ohio, regulated by the Ohio Environmental Protection Agency (Ohio EPA) Division of Drinking and Ground Waters alongside the federal Safe Drinking Water Act. For operators in 2026, the Ohio drinking water compliance requirements have grown heavier than they look: PFAS monitoring obligations are approaching, lead service line inventories are under active enforcement, and annual reporting deadlines carry no flexibility. A gap against either the federal or the Ohio layer lands on your system's EPA SDWIS record.
Ohio EPA regulates community water systems, non-transient non-community systems, and transient systems under Ohio Administrative Code (OAC) Chapter 3745-91. Community systems — those serving at least 15 service connections or 25 people year-round — carry the full monitoring and reporting burden. Small groundwater systems and mobile home parks are the most common, and the most likely to be operating with a single part-time operator.
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Community systems serving 25 to 1,000 people must collect at minimum one routine total coliform sample per month. A positive result triggers repeat sampling within 24 hours. Missed or late samples are the most common monitoring violation in Ohio SDWIS data, and the most preventable.
The EPA's LCRI, finalized October 2024, required every community water system to submit a complete lead service line inventory by the federal October 16, 2024 deadline. Under 40 CFR 141.84, service lines classified as unknown are treated as lead, triggering treatment technique requirements until the material is confirmed. Ohio's older industrial cities carry some of the highest lead service line counts in the country, and incomplete inventories surface at the next sanitary survey as a significant deficiency.
The EPA PFAS National Primary Drinking Water Regulation, finalized April 2024, set Maximum Contaminant Levels of 4 ppt for PFOA and PFOS. There is no size exemption — every community and non-transient non-community system must complete initial PFAS monitoring, with the initial monitoring window running through 2027 and MCL compliance required by 2029. Ohio has documented PFAS detections near manufacturing and fire-training sites, and groundwater systems near those areas are drawing enforcement attention.
Community water systems must distribute an annual CCR to all customers by July 1. The 2026 CCR adds mandatory disclosures: PFAS detection results and lead service line inventory status. A CCR that omits these elements, or was not distributed on time, is a reporting violation in SDWIS.
Ohio's primary drinking water standards sit in OAC 3745-81, with monitoring and reporting requirements in OAC 3745-82. Ohio EPA adds state-specific obligations on top of the federal floor, including routine monitoring frequencies and reporting through its electronic Drinking Water Information System (e-DWR).
Ohio requires water systems to be operated by certified operators under OAC 3745-7. Certification class corresponds to system classification, and the certified operator must be current and on record with Ohio EPA. A lapsed certification, or failing to update records after an operator change, is a routine sanitary survey finding and can trigger enforcement.
Agricultural runoff in Ohio's farming regions creates elevated nitrate risk, particularly in northwest Ohio. Nitrate above 10 mg/L requires immediate Tier 1 public notification within 24 hours. Systems in agricultural areas face more frequent monitoring requirements.
Ohio EPA conducts sanitary surveys on a schedule driven by system type and compliance history. The survey reviews source, treatment, storage, distribution, monitoring and reporting, and operator compliance. Uncorrected deficiencies from a prior survey become repeat findings with higher enforcement exposure at the next survey.
Your open violations, monitoring schedule, and inspection history are in the EPA SDWIS database; Ohio EPA also publishes compliance history through its drinking water portal. The fastest way to see your current federal status is a free lookup at orevant.com using your PWS ID, printed on any Ohio EPA correspondence. For the complete picture including Ohio-specific obligations, the $199 compliance scan covers both federal SDWA and Ohio EPA requirements for your system type and size.
Check Your Ohio Water System — Free at orevant.com
Yes. Ohio-specific requirements including OAC 3745-81 and 3745-82 monitoring obligations are included alongside all applicable federal EPA standards.
We pull from EPA SDWIS regularly and map Ohio-specific obligations for your system type and size.
Orevant is built for small systems. Requirements are filtered by your classification, population served, and source water, so a small groundwater system never sees rules that only apply to a large surface water utility.
Free water system lookup — search by system name or PWSID. See your EPA profile, current violations, and upcoming deadlines in minutes.
Orevant provides compliance information tools. Content on this page does not constitute legal advice. Compliance determinations should be verified with your state primacy agency.