FAIRFIELD, OH · Butler County

HAMILTON PUBLIC WATER SYSTEM Water System

Current status

1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Ohio’s official records. Always confirm current status with Ohio before making decisions based on this information.

System facts

System ID (PWSID): OH0904012
System type: Community Water System
Population served: 62,447
Service connections: 24,433
Ownership: local government
Water source: groundwater (wells)

Violation history

Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
December 30, 2025
Unaddressed
Monitoring and Reporting (DBP)
—
Chlorite
April 1, 2025 – April 30, 2025
Archived
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
December 23, 2019 – June 23, 2020
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
January 10, 2019 – July 8, 2019
Resolved
Monitoring and Reporting (DBP)
—
Chlorite
June 1, 2005 – August 31, 2005
Resolved
Monitoring and Reporting (DBP)
—
Chlorite
April 1, 2005 – June 30, 2005
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2002 – April 8, 2002
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
March 1, 1997 – March 31, 1997
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
October 1, 1994 – October 31, 1994
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
June 1, 1993 – June 30, 1993
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
November 1, 1991 – November 30, 1991
Archived

Unaddressed no corrective action on record yetArchived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
December 30, 2025	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Unaddressed
April 1, 2025 – April 30, 2025	Monitoring and Reporting (DBP)	Chlorite	—	Archived
December 23, 2019 – June 23, 2020	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
January 10, 2019 – July 8, 2019	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
June 1, 2005 – August 31, 2005	Monitoring and Reporting (DBP)	Chlorite	—	Resolved
April 1, 2005 – June 30, 2005	Monitoring and Reporting (DBP)	Chlorite	—	Resolved
January 1, 2002 – April 8, 2002	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
March 1, 1997 – March 31, 1997	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 1994 – October 31, 1994	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 1993 – June 30, 1993	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
November 1, 1991 – November 30, 1991	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Archived

Unaddressed no corrective action on record yetArchived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state

Enforcement actions

May 20, 2025State Public Notification requested2 linked violations
July 8, 2019State Compliance achieved2 linked violations
January 10, 2019State Violation/Reminder Notice2 linked violations
April 19, 2007State Compliance achieved2 linked violations
July 8, 2005State Violation/Reminder Notice11 linked violations

Contact

MOSLEY, JAY

Phone not on record

FAIRFIELD, OH 45014