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CITY OF MERCEDES

Texas — Community Water System — PWSID: TX1080007

System Information

PWSIDTX1080007
System NameCITY OF MERCEDES
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region06
Serves SchoolNo
WholesalerYes
First ReportedMar 14, 1980
Last ReportedJan 6, 2026

Location & Contact

StateTexas
CityMERCEDES
ZIP Code78570-0837
AddressPO BOX 837
OrganizationMONTOYA, SR, OSCAR, D
Phone956-565-3114

Population & Service

Population Served16,258
Service Connections6,061

Drinking Water Violations (81)

This water system has 81 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
May 1, 2025 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Oct 17, 2024 — LEAD AND COPPER RULE REVISIONS TT Yes No — — — Unaddressed — Lead and Copper Rule Revisions
Oct 17, 2024 — LEAD AND COPPER RULE REVISIONS TT Yes No — — — Unaddressed — Lead and Copper Rule Revisions
Oct 17, 2024 — LEAD AND COPPER RULE REVISIONS RPT No No — — — Unaddressed — Lead and Copper Rule Revisions
Oct 17, 2024 — LEAD AND COPPER RULE REVISIONS RPT No No — — — Unaddressed — Lead and Copper Rule Revisions
May 5, 2020 — E. COLI MR No Yes — — — Resolved Jul 21, 2020 Ground Water Rule
May 5, 2020 — E. COLI MR No Yes — — — Resolved Jul 21, 2020 Ground Water Rule
Oct 1, 2013 — Lead and Copper Rule MR No No — TT — Resolved Aug 12, 2014 Lead and Copper Rule
Jul 13, 2013 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .1 MG/L 0.080 mg/L .08 Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .1 MG/L 0.080 mg/L .08 Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .1 MG/L 0.080 mg/L .08 Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .1 MG/L 0.080 mg/L .08 Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Oct 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2012 Total Coliform Rule
Oct 1, 2012 Oct 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2012 Total Coliform Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Oct 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2012 Total Coliform Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Oct 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2012 Total Coliform Rule
Oct 1, 2012 Oct 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2012 Total Coliform Rule
Oct 1, 2012 Dec 31, 2012 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Oct 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2012 Total Coliform Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 — Public Notice Other No No — — — Resolved Feb 12, 2013 Public Notice Rule and Revised PN Rule
Oct 1, 2012 — Public Notice Other No No — — — Resolved Feb 12, 2013 Public Notice Rule and Revised PN Rule
Oct 1, 2012 — Public Notice Other No No — — — Resolved Feb 12, 2013 Public Notice Rule and Revised PN Rule
Oct 1, 2012 Dec 31, 2012 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2012 Aug 31, 2012 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Aug 31, 2012 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jun 1, 2011 Jun 30, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2011 Total Coliform Rule
Jun 1, 2011 Jun 30, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2011 Total Coliform Rule
Apr 15, 2011 — Public Notice Other No No — — — Addressed — Public Notice Rule and Revised PN Rule
Apr 15, 2011 — Public Notice Other No No — — — Addressed — Public Notice Rule and Revised PN Rule
Jan 10, 2011 — Public Notice Other No No — — — Addressed — Public Notice Rule and Revised PN Rule
Jan 10, 2011 — Public Notice Other No No — — — Addressed — Public Notice Rule and Revised PN Rule
Jan 10, 2011 — Public Notice Other No No — — — Addressed — Public Notice Rule and Revised PN Rule
Sep 1, 2010 Sep 30, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2010 Total Coliform Rule
Sep 1, 2010 Sep 30, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2010 Total Coliform Rule
Sep 1, 2010 Sep 30, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2010 Total Coliform 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.

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