Public water system · OH0900715
ActiveFairfield City Pws
At a glance
Fairfield City Pws (PWSID OH0900715) is an active community water system in Butler County, Ohio. It reports serving 44,907 people through 13,682 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in February 1998.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
44,907
Service connections
13,682
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Fairfield City Pws compare with other water systems in Butler County?
By EPA's size categories, Fairfield City Pws is a large system (10,001 to 100,000 people). Butler County has 20 active public water systems, and Fairfield City Pws is the 4th-largest of them by population served. Its population served is about 137% above the county average of 18,928 people per system, and accounts for 12% of the 378,564 people reported by systems filed under the county. Across Ohio, the 3,854 active systems average 2,767 people each. Nationally, the average active community water system reports serving 6,703 people, so Fairfield City Pws is about 6.7 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Ohio has 1,028 active community water systems, 27% of the state's 3,854 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 3,446 Ohio systems (89%) list groundwater as their primary source.
Who owns and regulates Fairfield City Pws?
EPA lists Fairfield City Pws as owned by a local government. The OH state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 8 of the 20 active systems in Butler County (40%) are also owned by a local government.
Does Fairfield City Pws have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in February 1998. The violations listed here began between August 1994 and February 1998. By type: 3 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 4 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1998-02-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 1995-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1994-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 4 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Fairfield City Pws: frequently asked questions
Who runs Fairfield City Pws?
Fairfield City Pws (PWSID OH0900715) is a community water system owned by a local government. It is regulated by the OH state drinking water program.
How many people does Fairfield City Pws serve?
Fairfield City Pws reports serving 44,907 people through 13,682 service connections in Butler County, Ohio.
Where does Fairfield City Pws get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Fairfield City Pws have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in February 1998. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Fairfield City Pws' water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in February 1998. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.
Where can I find Fairfield City Pws' water quality report?
As a community water system, Fairfield City Pws must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Butler County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Butler Co. Water District 2 Pws | Butler | 116,572 | Community | Purchased surface water |
| Hamilton Public Water System | Butler | 62,447 | Community | Groundwater |
| Middletown City Pws | Butler | 51,229 | Community | Groundwater |
| Southwest Regional Water District | Butler | 42,856 | Community | Groundwater |
| Oxford City Pws | Butler | 24,000 | Community | Groundwater |
| Monroe City Pws | Butler | 15,600 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Fairfield City Pws, PWSID OH0900715, Ohio”, https://aquacensus.com/water-systems/ohio/fairfield-city-pws-oh0900715 (data as of October 1, 2026).