SAIPAN, MP
Diamond Water Gualo Rai Water System
Consumer Confidence Report status
Diamond Water Gualo Rai 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 Diamond Water Gualo Rai.
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)
- MP0000221
- System type
- Community Water System
- Population served
- 55
- Service connections
- 1
- Ownership
- privately owned
- Water source
- groundwater (wells)
Diamond Water Gualo Rai is one of 92 community water systems in Northern Mariana Islands in the 500 or fewer people size category, serving 55 people from groundwater.
As of August 1, 2026, its federal record holds 4 entries between 2021 and 2024, all of which EPA lists as closed.
Of the 4, 1 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 Groundwater Rule and inorganic chemicals.
Violation history
Failure To Address Deficiency
Health-basedGroundwater Rule
August 15, 2024 – April 1, 2025
ResolvedFailure To Address Deficiency
Health-basedGroundwater Rule
August 15, 2024 – April 1, 2025
ResolvedMonitoring, Regular
—Nitrate
January 1, 2023 – December 31, 2023
ResolvedFailure To Address Deficiency
Health-basedGroundwater Rule
November 13, 2021 – April 26, 2022
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| August 15, 2024 – April 1, 2025 | Failure To Address Deficiency | Groundwater Rule | Health-based | Resolved |
| August 15, 2024 – April 1, 2025 | Failure To Address Deficiency | Groundwater Rule | Health-based | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Nitrate | — | Resolved |
| November 13, 2021 – April 26, 2022 | Failure To Address Deficiency | Groundwater Rule | Health-based | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- April 1, 2025State Compliance achieved1 linked violation
- April 1, 2025State Compliance achieved1 linked violation
- March 18, 2024State Compliance achieved1 linked violation
- April 26, 2022State Compliance achieved1 linked violation
Common questions
Is Diamond Water Gualo Rai required to publish a Consumer Confidence Report?
- Yes. Diamond Water Gualo Rai 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 Diamond Water Gualo Rai’s next Consumer Confidence Report due?
- Diamond Water Gualo Rai’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does Diamond Water Gualo Rai have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for Diamond Water Gualo Rai.
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
Diamond Ice & Water
6703223222
SAIPAN, MP 96950