HENNINGER FLATS
California - Transient Non-Community - PWSID: CA1900764
System Information
| PWSID | CA1900764 |
| System Name | HENNINGER FLATS |
| System Type | Transient Non-Community |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Jun 22, 2026 |
Location & Contact
| State | California |
| City | DIAMOND BAR |
| ZIP Code | 92756 |
| Address | 1061 GRAND AVENUE |
| Organization | BROWN, THOMAS |
| Phone | 909-569-0800 |
Population & Service
| Population Served | 50 |
| Service Connections | 1 |
Drinking Water Violations (1)
This water system has 1 violation 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aug 1, 1984 | Aug 31, 1984 | Other | No | No | - | - | - | Archived | Aug 31, 1984 | - |
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.