Provider, PWSID, source-water, ZIP, testing and treatment research for properties in Cincinnati, Ohio.
Water decisions in Cincinnati should begin with the provider shown on the current bill, not with the city name alone. Hamilton County service boundaries can cross ZIP codes, municipal lines and neighboring systems. The current research starting point is Cincinnati Public Water System, with a source profile described as ohio river surface water and great miami buried-valley aquifer.
Greater Cincinnati Water Works treats Ohio River surface water at the Miller plant and groundwater from the Great Miami buried-valley aquifer at the Bolton plant.
The provider record is a starting point, not a household diagnosis. Public-system information describes utility monitoring and compliance. It does not prove the condition at every address, account for service-line or building plumbing, or represent a private well.
Southwest Ohio includes Ohio River treatment, buried-valley aquifer groundwater and purchased-water distribution, so source and supplier must be separated.
The guide represents common Cincinnati mailing ZIPs—45202, 45203, 45204, 45205, 45206, 45207, 45208, 45209 and 24 additional common ZIPs—and uses Cincinnati Public Water System with OH3102612 as the current research starting point.
The bill, service address, current report and property plumbing determine whether the starting point applies. ZIPs, city limits and county lines do not define one water-service boundary.
Cincinnati is grouped with Norwood, Blue Ash, Mason, Loveland inside the Cincinnati and Southwest Ohio hub. Those pages help compare regional systems but do not prove that the same supplier serves each address.
A resident researching PFAS, lead or another health-related concern in Cincinnati should document analyte, unit, sample point, date and reporting limit before interpreting a headline or database result.
ZIP codes do not define utility boundaries. The entries below are static research links for common Cincinnati mailing ZIPs. Confirm the street address, provider and PWSID before relying on a result.
| ZIP code | Postal use | Utility starting point | PWSID | Source profile | Research links |
|---|---|---|---|---|---|
| 45202 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45203 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45204 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45205 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45206 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45207 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45208 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45209 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45211 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45212 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45213 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45214 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45215 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45216 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45217 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45219 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45220 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45223 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45224 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45225 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45226 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45227 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45229 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45230 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45231 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45232 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45233 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45237 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45238 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45239 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45243 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer | |
| 45248 | Common street-address research ZIPUse the property street address, not a PO Box, to confirm the provider. | Cincinnati Public Water SystemVerified public-system research starting point; confirm the current account. | OH3102612 | Ohio River surface water and Great Miami buried-valley aquifer |
ZIP data attribution: common ZIP research starting points were compiled from Ready APIs curated-us-zips, sourced from the U.S. Census Bureau, USPS and SimpleMaps. Postal ZIPs are not water-service boundaries.
A city report should lead to a better decision—not to an automatic equipment recommendation. The correct system depends on what is documented and what the household wants to improve.
Consider point-of-entry treatment when the concern affects multiple fixtures and the exact model has the required reduction claims and flow capacity.
Compare whole-house systems →Use measured hardness to size a softener. A softener controls calcium and magnesium scale; it is not a universal contaminant filter.
Understand water softeners →RO is usually a drinking-water solution. Match the exact membrane system and certification to the specific dissolved substances of concern.
Review reverse osmosis →Installation conditions, plumbing layout, drain access, flow, pressure and maintenance matter. Review professional installation and financing options before final equipment selection.
The Cincinnati metropolitan footprint crosses the Ohio River. A Kentucky address should be researched through KentuckyWaterFiltration.com rather than through an Ohio city page, even when the customer identifies with the same metro area.
Why this matters: provider IDs, annual reports and state databases change at the state line.
The research starting point is Cincinnati Public Water System. That is not a guarantee for every address. Confirm the provider on the current bill and match OH3102612 in Ohio Drinking Water Watch before relying on a utility-wide result.
No. ZIP codes are postal-delivery areas, not water-service boundaries. One ZIP can contain multiple public systems, purchased-water zones and private wells.
Review the current provider, PWSID, newest annual water-quality report, source-water type, any Ohio EPA or UCMR records relevant to that system, and property-specific conditions such as hardness, plumbing age, taste, odor or staining.
No. A utility report describes system-wide monitoring. It cannot prove the same condition at every tap, and it does not describe private plumbing, service-line material, a private well or a treatment system already installed at the property.
There is no responsible citywide answer. A softener addresses hardness; carbon may address selected taste, odor and chemical-reduction goals; reverse osmosis targets drinking water; and whole-house filtration must be matched to flow, test evidence and exact certified claims.
Share the provider, source, ZIP code, report or test result and the improvement you want. The response can address testing, whole-house filtration, softening, reverse osmosis, professional installation and financing availability.
These links are starting points. Use the newest utility report and current account information before relying on a result.
Data timing: Ohio and EPA public-system records can lag current utility operations. EWG is an independent comparison source and is not a regulator or a Zero Trace Water partner. Ohio EPA PFAS and cyanotoxin records distinguish sample points and can include raw and finished water.
