CITY OF MERCEDES
Texas — Community Water System — PWSID: TX1080007
System Information
| PWSID | TX1080007 |
| System Name | CITY OF MERCEDES |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 06 |
| Serves School | No |
| Wholesaler | Yes |
| First Reported | Mar 14, 1980 |
| Last Reported | Mar 31, 2026 |
Location & Contact
| State | Texas |
| City | MERCEDES |
| ZIP Code | 78570-0837 |
| Address | PO BOX 837 |
| Organization | MONTOYA, SR, OSCAR, D |
| Phone | 956-565-3114 |
Population & Service
| Population Served | 16,258 |
| Service Connections | 6,061 |
Drinking Water Violations (118)
This water system has 118 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec 30, 2025 | — | MR | No | No | — | TT | — | Unaddressed | — | — | |
| May 1, 2025 | — | Other | No | No | — | — | — | Resolved | Oct 2, 2025 | — | |
| May 1, 2025 | — | Other | No | No | — | — | — | Resolved | Oct 2, 2025 | — | |
| Oct 17, 2024 | — | RPT | No | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | RPT | No | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | RPT | No | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | RPT | No | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | TT | Yes | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | TT | Yes | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | TT | Yes | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| Oct 17, 2024 | — | TT | Yes | No | — | — | — | Resolved | Oct 3, 2025 | — | |
| May 5, 2020 | — | MR | No | Yes | — | — | — | Resolved | Jul 21, 2020 | — | |
| May 5, 2020 | — | MR | No | Yes | — | — | — | Resolved | Jul 21, 2020 | — | |
| May 5, 2020 | — | MR | No | Yes | — | — | — | Resolved | Jul 21, 2020 | — | |
| May 5, 2020 | — | MR | No | Yes | — | — | — | Resolved | Jul 21, 2020 | — | |
| Oct 1, 2013 | — | MR | No | No | — | TT | — | Resolved | Aug 12, 2014 | — | |
| Jul 13, 2013 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Jul 1, 2013 | Sep 30, 2013 | MCL | Yes | No | .086 MG/L | 0.080 mg/L | .08 | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MCL | Yes | No | .086 MG/L | 0.080 mg/L | .08 | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MCL | Yes | No | .086 MG/L | 0.080 mg/L | .08 | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MCL | Yes | No | .086 MG/L | 0.080 mg/L | .08 | Resolved | Sep 30, 2013 | — | |
| Apr 1, 2013 | Jun 30, 2013 | MCL | Yes | No | .1 MG/L | 0.080 mg/L | .08 | Resolved | Jun 30, 2013 | — | |
| Apr 1, 2013 | Jun 30, 2013 | MCL | Yes | No | .1 MG/L | 0.080 mg/L | .08 | Resolved | Jun 30, 2013 | — | |
| Apr 1, 2013 | Jun 30, 2013 | MCL | Yes | No | .1 MG/L | 0.080 mg/L | .08 | Resolved | Jun 30, 2013 | — | |
| Apr 1, 2013 | Jun 30, 2013 | MCL | Yes | No | .1 MG/L | 0.080 mg/L | .08 | Resolved | Jun 30, 2013 | — | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | .107 MG/L | 0.080 mg/L | .08 | Resolved | Mar 31, 2013 | — | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | .107 MG/L | 0.080 mg/L | .08 | Resolved | Mar 31, 2013 | — | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | .107 MG/L | 0.080 mg/L | .08 | Resolved | Mar 31, 2013 | — | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | .107 MG/L | 0.080 mg/L | .08 | Resolved | Mar 31, 2013 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | — | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | — | |
| Oct 1, 2012 | — | Other | No | No | — | — | — | Resolved | Feb 12, 2013 | — | |
| Oct 1, 2012 | — | Other | No | No | — | — | — | Resolved | Feb 12, 2013 | — | |
| Oct 1, 2012 | — | Other | No | No | — | — | — | Resolved | Feb 12, 2013 | — | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | — | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | — | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | — | |
| Aug 1, 2012 | Aug 31, 2012 | TT | Yes | No | — | — | — | Resolved | Aug 31, 2012 | — | |
| Jun 1, 2011 | Jun 30, 2011 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2011 | — | |
| Jun 1, 2011 | Jun 30, 2011 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2011 | — |
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.