KOOLAU RANCH
Hawaii — Non-Transient Non-Community — PWSID: HI0000438
System Information
| PWSID | HI0000438 |
| System Name | KOOLAU RANCH |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Jun 7, 2024 |
| Last Reported | Dec 8, 2025 |
Location & Contact
| State | Hawaii |
| City | KILAUEA |
| ZIP Code | 96754 |
| Address | Koolau Ranch |
| Organization | GUIMARAES, ROBERTO |
| Phone | — |
Population & Service
| Population Served | 60 |
| Service Connections | 9 |
Drinking Water Violations
No violations recorded for this water system in the EPA SDWIS database.
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.