Public water system record
Hamilton Public Water System
Serves Hamilton, Butler County, OH · 62,447 people served
Federal records show no health-based violations and 4 monitoring/reporting issues for Hamilton Public Water System in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 4
Key facts
- Hamilton Public Water System draws water from 21 wells.
- Most recent enforcement action: boil water order by Ohio, September 1997.
- Record on file since 1991, with 8 health-based violations before October 19, 2016.
- Lead pipe inventory: 4,156 lead and 7,230 unknown out of 23,072 service lines.
Check whether Hamilton Public Water System serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Dec 30, 2025 | Active |
|
Chlorite
Monitoring and reporting
|
Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Consumer Confidence Rule
OTHER
|
Dec 23, 2019 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jan 10, 2019 | Resolved |
Full record since 1991
EPA's records for Hamilton Public Water System go back to 1991. Before October 19, 2016 they list 8 health-based violations (7 resolved, 1 archived by EPA without a recorded fix) and 4 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 8 | 1 |
| 2000s | 0 | 3 |
| October 19, 2016 to 2019 | 0 | 2 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Total Coliform (acute), began September 1997, Resolved.
Show all 8 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform (acute)
Contaminant limit exceeded
|
Sep 1, 1997 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Mar 1, 1997 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Oct 1, 1994 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Jun 1, 1993 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Jun 1, 1992 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
May 1, 1992 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Nov 1, 1991 | Archived |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Nov 1, 1991 | Resolved |
Enforcement actions
Ohio regulators issued 2 boil water orders to Hamilton Public Water System in 1997. The most recent was a boil water order in September 1997.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 22, 1997 | Ohio | Boil water order | 1 violation (1 health-based): Total Coliform |
| Apr 2, 1997 | Ohio | Boil water order | 1 violation (1 health-based): Total Coliform |
Where the water comes from
Hamilton Public Water System draws water from 21 wells. 1 other community water system and 1 smaller public system such as schools, businesses or campgrounds buy water from Hamilton Public Water System.
Community systems that buy water from it
- Butler Co. Water District 2 PWS Hamilton, OH
Annual water quality report
Hamilton Public Water System must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Ohio.
Certified drinking water labs by state EPA guidance for private wells