Public Water Partners

Saipan, MP

Commonwealth Utilities Corp (Tinian) Water System

Consumer Confidence Report status

Commonwealth Utilities Corp (Tinian) 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 no open violations for Commonwealth Utilities Corp (Tinian).

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 Northern Mariana Islands’s official records. Always confirm current status with Northern Mariana Islands before making decisions based on this information.

System facts

System ID (PWSID)
MP0000002
System type
Community Water System
Population served
3,005
Service connections
733
Ownership
state government
Water source
groundwater (wells)

Commonwealth Utilities Corp (Tinian) is among the 6 largest community water systems in Northern Mariana Islands, serving 3,005 people from groundwater.

As of August 1, 2026, its federal record holds 17 entries between 2001 and 2022, all of which EPA lists as closed. Nothing has been added since 2022.

Of the 17, 11 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 Lead and Copper Rule, the Total Coliform Rules, and the Groundwater Rule.

Violation history

  • Failure To Address Deficiency

    Health-based

    Groundwater Rule

    December 31, 2022 – February 28, 2023

    Resolved

  • Public Notification Violation for NPDWR Violation

    —

    Public Notice

    December 31, 2022 – June 30, 2023

    Resolved

  • Follow-up Or Routine LCR Tap M/R

    —

    Lead and Copper Rule

    January 1, 2020 – September 23, 2022

    Resolved

  • Failure To Address Deficiency

    Health-based

    Groundwater Rule

    July 30, 2019 – August 2, 2022

    Resolved

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 2008 – August 31, 2008

    Resolved

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    April 1, 2008 – April 30, 2008

    Resolved

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    April 1, 2007 – April 30, 2007

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2005 – December 14, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2005 – December 14, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2003 – December 14, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2003 – December 14, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    July 1, 2002 – May 24, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    July 1, 2002 – May 24, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2002 – May 24, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2002 – May 24, 2005

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    July 1, 2001 – June 26, 2003

    Resolved

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    July 1, 2001 – June 26, 2003

    Resolved

Resolved addressed and confirmed by the state

Enforcement actions

Common questions

Is Commonwealth Utilities Corp (Tinian) required to publish a Consumer Confidence Report?

Yes. Commonwealth Utilities Corp (Tinian) 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 Commonwealth Utilities Corp (Tinian)’s next Consumer Confidence Report due?

Commonwealth Utilities Corp (Tinian)’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does Commonwealth Utilities Corp (Tinian) have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for Commonwealth Utilities Corp (Tinian).

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

Commonwealth Utility Corporation

6706644282

Saipan, MP 96950