Public water system record
Aqua NJ - Hamilton Square
Serves an area of Mercer County, NJ that includes Hamilton Square, Mercerville, Groveville and 2 more places · 39,128 people served
Federal records show no health-based violations and 19 monitoring/reporting issues for Aqua NJ - Hamilton Square 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
- 19
Key facts
- Aqua NJ - Hamilton Square draws water from 5 wells.
- Record on file since 1997, with 2 health-based violations before October 19, 2016.
- Lead pipe inventory: 2 lead and 627 unknown out of 16,223 service lines.
Check whether Aqua NJ - Hamilton Square 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 |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Radium-228
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Radium-226
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Combined Uranium
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2023 | Active |
|
E. coli
Monitoring and reporting
|
Oct 3, 2023 | Active |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Radium-228
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Radium-226
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Combined Uranium
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Dec 11, 2019 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2019 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
Full record since 1997
EPA's records for Aqua NJ - Hamilton Square go back to 1997. Before October 19, 2016 they list 2 health-based violations (2 resolved) and 28 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2000s | 2 | 22 |
| 2010 to October 18, 2016 | 0 | 5 |
| October 19, 2016 to 2019 | 0 | 3 |
| 2020s | 0 | 16 |
Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began July 2006, Resolved.
Show all 2 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.6 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
|
Jul 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2004 | Resolved |
Where the water comes from
Aqua NJ - Hamilton Square draws water from 5 wells. It also has a seasonal connection to Trenton Water Works. 2 other community water systems buy water from Aqua NJ - Hamilton Square.
Emergency or part-time connections to
- Trenton Water Works Trenton, NJ
Community systems that buy water from it
- Robbinsville Twp - Newtown Village Robbinsville, NJ
- Trenton Water Works Trenton, NJ
Annual water quality report
Aqua NJ - Hamilton Square 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 New Jersey.
Certified drinking water labs by state EPA guidance for private wells