Records currently available
Ohio record snapshot
These counts describe reviewed records available on Water Quality Lookup. They are not a count of every provider, city, or county in Ohio.
Reviewed profiles or limited identity records.
Local entry points, not service-area boundaries.
Guide sources reviewed September 13, 2026.
Cities
Ohio city entry points currently available
These Ohio city pages are local starting points. City boundaries and water service areas may not match, and more than one provider may serve a city.
Dayton
Start with DAYTON PUBLIC WATER SYSTEM, then confirm the provider for your address.
Open DaytonCanton
Start with CANTON PUBLIC WATER SYSTEM, then confirm the provider for your address.
Open CantonHamilton
Start with HAMILTON PUBLIC WATER SYSTEM, then confirm the provider for your address.
Open HamiltonWater systems
Ohio public water systems currently available
These previews link to reviewed system profiles with identifiers, report-year context, sources, and limitations.
DAYTON PUBLIC WATER SYSTEM
PWSID OH5703512 · Dayton · Latest reviewed report 2025
View system profileCANTON PUBLIC WATER SYSTEM
PWSID OH7608112 · Canton · Latest reviewed report 2025
View system profileHAMILTON PUBLIC WATER SYSTEM
PWSID OH0904012 · Hamilton · Latest reviewed report 2025
View system profileReport context
Three Ohio systems and their 2025 reports
These source-water descriptions come from existing system profiles reviewed August 2, 2026. The reports describe past reporting periods, not current conditions at an address.
Hamilton · OH0904012
Great Miami Buried Valley Aquifer
Hamilton’s 2025 report identifies this aquifer as its groundwater source. Its selected results distinguish the North and South plants.
The existing overview also retains the report’s missed chlorite-monitoring context and corrections to the prior report. A selected result row does not replace those disclosures.
Dayton · OH5703512
Miami and Mad River well fields
Dayton’s 2025 report describes groundwater pumped from the Great Miami River Buried Valley Aquifer through these well fields. Water is treated at the Miami and Ottawa plants.
The existing overview keeps each plant’s selected nitrate results separate from distribution-system chlorine results. The sampling location is part of the result’s meaning.
Canton · OH7608112
Three well fields and treatment plants
Canton’s 2025 report describes groundwater from three well fields supplying three treatment plants. Its selected barium result was sampled in 2022, while the selected fluoride result is from 2025.
The existing overview preserves the report’s dated reservoir-deficiency and corrective-action context without treating it as a current status update.
Continue your Ohio lookup
Use the system directory, a plain-language guide, or the methodology page for the next step.
System directory
Ohio public water systems
Browse the reviewed system profiles currently available for this state.
Browse systemsLookup guide
How to look up your drinking water system
Start with a utility bill, PWSID, state lookup tool, or official report so you can find the public water system behind a city or provider name.
Read the lookup guideReport guide
How to read a water quality report
A plain-English walkthrough of Consumer Confidence Reports, including report years, detected contaminants, legal limits, violations, and source notes.
Read the report guideData and trust
Sources, methodology, and limitations
See how records are sourced, reviewed, dated, and limited before using a summary.
Review methodologyStatewide context
Read Ohio’s water records in context
Record types
A system, facility, and sampling point are different records
Ohio EPA’s October 2024 Drinking Water Viewer guide separates water systems, facilities, sampling points, results, schedules, and violations. A system ID identifies the public water system; a facility or sampling-point record describes one part of it.
The guide says the public sampling-point list shows active points and omits proposed or inactive points. A missing point in that view does not establish that it never existed or was never sampled.
Search dates
Check the date window before drawing a conclusion
Ohio EPA’s October 2024 guide describes a two-year default collection window for sample searches and a three-year default window for violations. Each search can cover up to five years at a time.
Adjust the date range for the question you are researching. An empty result within a filter does not establish that there are no historical records or current notices.
Groundwater context
A public groundwater system is different from a private well
Hamilton, Dayton, and Canton each describe groundwater supplies in their reviewed reports. These are public-system examples; they are not a statewide groundwater inventory or evidence about a nearby private well.
Confirm the provider using your bill, property manager, or utility before applying a report to your situation. A city name or nearby well field does not establish service to a property.
Official system lookup
Find an Ohio public water system record
Ohio EPA’s Drinking Water Viewer replaces Drinking Water Watch. Start with the full PWSID or utility name from a bill or annual report.
Lookup steps
Search the Drinking Water Viewer
- Open the Viewer and choose Water Systems. Enter the full ID in Water System ID, or search using Water System Name.
- Select Search, then open the matching ID or name. Compare the identity with your bill or report before reading the record.
- Use the record’s Menu to choose the kind of information you need. Ohio EPA’s guide explains the facilities, samples, schedules, and violation views and their filters.
- For a Viewer question, use Ohio EPA’s Viewer guidance page or the Information Management Section contact in the guide. Ask the utility directly to confirm service to your property.
Verified identity example
Hamilton Public Water System · OH0904012
During this guide’s review, entering OH0904012 in the Viewer returned one matching HAMILTON PUBLIC WATER SYSTEM record. Opening its ID confirmed the same identity; EPA’s separate exact-ID record matched it too.
The system page separates source-water, purchased-water, and service-type information. Those fields describe the system and do not confirm which provider serves an individual address.
Other official tools
Reports, notices, and household questions
Annual reports
Find an issued report or request a copy
Dayton’s Water Quality page and Canton’s report archive list reports by year. Hamilton links its 2025 report from Utility Bill Inserts. Use the reporting year inside the document, then check individual sample dates.
If a report is missing or difficult to use, ask the provider for the reporting year and accessible format or language assistance you need. The selected overviews above do not cover every Ohio report.
Browse Dayton’s water reports →
Notices and alerts
Use the provider’s current instructions
Hamilton’s boil-advisory page explains its notification channels, including Butler County’s emergency notification system, local media, and city social media. Follow that page’s enrollment link if it applies to your service.
Canton publishes Water Department announcements separately from its annual reports. Read the affected area, issue date, and any later update; an empty announcements page does not establish that no notice exists elsewhere.
Lead and service lines
Use the material resources for your own utility
Canton’s Lead Awareness page links a Service Line Map and a Service Line Material Survey. These describe a different subject from the lead-and-copper sample summaries in Ohio’s Viewer.
Ask your provider what is known about both portions of your service line and how to resolve an unknown material. A utility map or survey link alone does not establish your property’s material, replacement eligibility, or tap-water result.
PFAS information
Separate project updates from measured results
Dayton’s PFAS and Drinking Water page links local project information and Ohio EPA funding documents. Those resources describe program activity; they do not provide a statewide PFAS result summary.
For a measured result, use the relevant system’s report or sample record and retain the compound, unit, sampling date, and location. Do not treat a project announcement as a result for your household.
Private wells and testing
Follow a separate well-testing pathway
Ohio’s Private Water Systems Program is administered by the Department of Health and local health districts. It covers private wells and other private supplies, including springs and rainwater cisterns. Use its homeowner and contact resources for a private-supply question.
A nearby public-system report does not describe your private well. The well needs its own testing and maintenance pathway.
Use EPA’s laboratory resources to find the relevant certification program. Confirm that a laboratory accepts residential samples and performs the specific test you need, then obtain collection instructions before sampling.
Lookup questions
Using Ohio’s water information
Is Drinking Water Watch still the Ohio lookup tool?
Ohio EPA’s October 2024 guide identifies Drinking Water Viewer as its replacement. Use the Viewer linked by Ohio EPA and search with the full system ID or name.
Why might an older sample be missing from a search?
The Viewer guide describes a default two-year sample window. Check Collected Between and adjust the range; the guide permits up to five years per search. Ask Ohio EPA about records you still cannot find.
Why does Canton’s 2025 report include a 2022 result?
The reporting year is not necessarily the sampling year of every row. The reviewed Canton overview preserves 2022 for barium and 2025 for fluoride so the dates remain visible when comparing results.
Does a groundwater report describe my private well?
No. The groundwater descriptions here belong to the named public systems. A private well needs its own testing and maintenance pathway; proximity to a public well field does not establish shared conditions.
Official sources
Official sources for Ohio
Use Ohio Environmental Protection Agency and the official sources below to verify system identity, record dates, and current notices before relying on a summary.
Statewide sources
Ohio Environmental Protection Agency
PWSID OH0904012 · Sources for this system
Hamilton Public Water System
PWSID OH5703512 · Sources for this system
City of Dayton Department of Water
PWSID OH7608112 · Sources for this system