FAIRFIELD, OH · Butler County
HAMILTON PUBLIC WATER SYSTEM Water System
Consumer Confidence Report status
HAMILTON PUBLIC WATER SYSTEM must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show 1 item for HAMILTON PUBLIC WATER SYSTEM that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)
HAMILTON PUBLIC WATER SYSTEM is one of 180 community water systems in Ohio in the 10,001 to 100,000 people size category, serving 62,447 people from groundwater.
As of August 1, 2026, its federal record holds 10 entries between 1991 and 2025, of which 1 remains open; none are health-based.
Of the 10, 5 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Consumer Confidence Rule, the Stage 1 Disinfectants and Disinfection Byproducts Rule, and the Total Coliform Rules.
Violation history
Consumer Confidence Report Inadequate Reporting
—Consumer Confidence Rule
December 30, 2025
UnaddressedMonitoring and Reporting (DBP)
—Chlorite
April 1, 2025 – April 30, 2025
ArchivedConsumer Confidence Report Inadequate Reporting
—Consumer Confidence Rule
December 23, 2019 – June 23, 2020
ResolvedConsumer Confidence Report Inadequate Reporting
—Consumer Confidence Rule
January 10, 2019 – July 8, 2019
ResolvedMonitoring and Reporting (DBP)
—Chlorite
June 1, 2005 – August 31, 2005
ResolvedMonitoring and Reporting (DBP)
—Chlorite
April 1, 2005 – June 30, 2005
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
January 1, 2002 – April 8, 2002
ResolvedMaximum Contaminant Level Violation, Acute (TCR)
Health-basedColiform (TCR)
March 1, 1997 – March 31, 1997
ResolvedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
July 1, 1993 – May 25, 1995
ResolvedMaximum Contaminant Level Violation, Acute (TCR)
Health-basedColiform (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 |
| July 1, 1993 – May 25, 1995 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | 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
- January 20, 2026State Violation/Reminder Notice3 linked violations
- May 20, 2025State Public Notification requested2 linked violations
- July 8, 2019State Compliance achieved2 linked violations
- January 23, 2001State Compliance achieved2 linked violations
Common questions
Is HAMILTON PUBLIC WATER SYSTEM required to publish a Consumer Confidence Report?
- Yes. HAMILTON PUBLIC WATER SYSTEM is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is HAMILTON PUBLIC WATER SYSTEM’s next Consumer Confidence Report due?
- HAMILTON PUBLIC WATER SYSTEM’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does HAMILTON PUBLIC WATER SYSTEM have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show 1 item for HAMILTON PUBLIC WATER SYSTEM that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
MOSLEY, JAY
Phone not on record
FAIRFIELD, OH 45014