WAIKOLOA
Hawaii — Community Water System — PWSID: HI0000135
System Information
| PWSID | HI0000135 |
| System Name | WAIKOLOA |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Sep 10, 1979 |
| Last Reported | Dec 8, 2025 |
Location & Contact
| State | Hawaii |
| City | WAIKOLOA |
| ZIP Code | 96738 |
| Address | HAWAII WATER SERVICE COMPANY |
| Organization | CARRASCO, TONY |
| Phone | 808-883-2065 |
Population & Service
| Population Served | 12,100 |
| Service Connections | 2,120 |
Drinking Water Violations (11)
This water system has 11 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mar 1, 2010 | — | E. COLI | MR | No | No | — | — | — | Resolved | Jun 28, 2010 | Ground Water Rule |
| Mar 1, 2010 | — | E. COLI | MR | No | No | — | — | — | Resolved | Jun 28, 2010 | Ground Water Rule |
| Feb 1, 2010 | Feb 28, 2010 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 28, 2010 | Total Coliform Rule |
| Feb 1, 2010 | Feb 28, 2010 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 28, 2010 | Total Coliform Rule |
| Jan 1, 2000 | Jan 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Jan 31, 2000 | Total Coliform Rule |
| Jan 1, 2000 | Jan 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Jan 31, 2000 | Total Coliform Rule |
| Jan 1, 2000 | Jan 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Jan 31, 2000 | Total Coliform Rule |
| Jan 1, 2000 | Jan 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Jan 31, 2000 | Total Coliform Rule |
| Jan 1, 2000 | Jan 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Jan 31, 2000 | Total Coliform Rule |
| Jan 1, 2000 | Jan 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Jan 31, 2000 | Total Coliform Rule |
| Jul 1, 1992 | Dec 31, 1992 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 1992 | Lead and Copper Rule |
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.