Public water system record
Commonwealth Utilities Corp (Tinian)
Serves Carolinas, San Jose (Tinian Municipality), Marpo Heights and 2 more places, Tinian Municipality, MP · 3,005 people served
Federal records show 2 health-based violations and 2 monitoring/reporting issues for Commonwealth Utilities Corp (Tinian) in the last ten years. The most serious issue in this window was a resolved Groundwater Rule violation.
System profile
- Health-based violations, last 10 years
- 2
- Resolved
- 2
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 2
Key facts
- Commonwealth Utilities Corp (Tinian) draws water from 1 well.
- Record on file since 2001, with 3 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 1,901 unknown out of 1,901 service lines.
Check whether Commonwealth Utilities Corp (Tinian) 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.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Groundwater Rule
Treatment technique failure
|
140 | Dec 31, 2022 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jul 30, 2019 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Dec 31, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2020 | Resolved |
Full record since 2001
EPA's records for Commonwealth Utilities Corp (Tinian) go back to 2001. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 10 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 3 | 10 |
| October 19, 2016 to 2019 | 1 | 0 |
| 2020s | 1 | 2 |
Most recent health-based violation before October 19, 2016: Total Coliform, began August 2008, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2007 | Resolved |
What the violations mean
Groundwater Rule
2 incidentsThe system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Commonwealth Utilities Corp (Tinian) draws water from 1 well. 3 other community water systems buy water from Commonwealth Utilities Corp (Tinian).
Community systems that buy water from it
- 3K Ice and Water Company Tinian, MP
- Black Micro Corporation Tinian Saipan, MP
- Tinian Ice and Water Tinian, MP
Annual water quality report
Commonwealth Utilities Corp (Tinian) 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.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
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 the Northern Mariana Islands.
Certified drinking water labs by state EPA guidance for private wells