MODESTO, CITY OF
California — Community Water System — PWSID: CA5010010
System Information
| PWSID | CA5010010 |
| System Name | MODESTO, CITY OF |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | MODESTO |
| ZIP Code | 95355 |
| Address | 4240 Litt Road |
| Organization | MARTINEZ, MANUEL |
| Phone | 209-342-4592 |
Population & Service
| Population Served | 218,771 |
| Service Connections | 70,793 |
Drinking Water Violations (23)
This water system has 23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aug 1, 2013 | Aug 31, 2013 | Nitrate | MCL | Yes | No | 46 MG/L | 10 mg/L | 45 | Resolved | Aug 31, 2013 | Nitrate Rule |
| Aug 1, 2013 | Aug 31, 2013 | Nitrate | MCL | Yes | No | 46 MG/L | 10 mg/L | 45 | Resolved | Aug 31, 2013 | Nitrate Rule |
| Mar 1, 2007 | Mar 31, 2007 | Nitrate | MCL | Yes | No | 47.8 MG/L | 10 mg/L | 45 | Resolved | Mar 31, 2007 | Nitrate Rule |
| Mar 1, 2007 | Mar 31, 2007 | Nitrate | MCL | Yes | No | 47.8 MG/L | 10 mg/L | 45 | Resolved | Mar 31, 2007 | Nitrate Rule |
| Jan 1, 2001 | Jan 31, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2001 | Total Coliform Rule |
| Feb 1, 1996 | Feb 29, 1996 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 29, 1996 | Total Coliform Rule |
| Feb 1, 1996 | Feb 29, 1996 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 29, 1996 | Total Coliform Rule |
| Sep 1, 1995 | Sep 30, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 1995 | Total Coliform Rule |
| Sep 1, 1995 | Sep 30, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 1995 | Total Coliform Rule |
| May 1, 1995 | May 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | May 31, 1995 | Total Coliform Rule |
| May 1, 1995 | May 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | May 31, 1995 | Total Coliform Rule |
| Oct 1, 1994 | Oct 31, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1994 | Total Coliform Rule |
| Aug 1, 1994 | Aug 31, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1994 | Total Coliform Rule |
| Aug 1, 1994 | Aug 31, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1994 | Total Coliform Rule |
| Jul 1, 1994 | Jul 31, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 1994 | Total Coliform Rule |
| Jul 1, 1994 | Jul 31, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 1994 | Total Coliform Rule |
| Nov 1, 1993 | Nov 30, 1993 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1993 | Total Coliform Rule |
| Nov 1, 1993 | Nov 30, 1993 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1993 | Total Coliform Rule |
| Nov 1, 1993 | Oct 1, 1997 | Combined Uranium | MCL | Yes | No | 28.8 PCI/L | 30 ug/L | 20 | Resolved | Oct 1, 1997 | Radionuclides and Revised Rad Rule |
| Jul 1, 1993 | Jul 31, 1993 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 1993 | Total Coliform Rule |
| Jun 1, 1993 | Jun 30, 1993 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 30, 1993 | Total Coliform Rule |
| Nov 1, 1992 | Nov 30, 1992 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 1992 | Total Coliform Rule |
| — | — | — | No | No | — | — | — | — | — | — |
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.