Public water system · TX1080007

Active

City of Mercedes

At a glance

City of Mercedes (PWSID TX1080007) is an active community water system in Hidalgo County, Texas. It reports serving 16,258 people through 6,061 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

16,258

Service connections

6,061

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDTX1080007

System typeCommunity water system

Activity statusActive

Population served16,258

Service connections6,061

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyHidalgo County

How does City of Mercedes compare with other water systems in Hidalgo County?

By EPA's size categories, City of Mercedes is a large system (10,001 to 100,000 people). Hidalgo County has 28 active public water systems. Its population served is about half of the county average of 32,971 people per system, and accounts for 1.8% of the 923,185 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Mercedes is about 143% above that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Texas has 4,594 active community water systems, 65% of the state's 7,078 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 328 Texas systems (4.6%) list surface water as their primary source.

Who owns and regulates City of Mercedes?

EPA lists City of Mercedes as owned by a local government. The TX state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 21 of the 28 active systems in Hidalgo County (75%) are also owned by a local government.

Does City of Mercedes have drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 2025. The violations listed here began between October 2012 and December 2025. By type: 4 monitoring and reporting, 4 contaminant level above the legal limit, 2 public notice, recordkeeping or other, 1 reporting and 1 required treatment not met. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (5 of them). EPA lists 11 as resolved and 1 as unaddressed. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2025-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2025-05-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2024-10-17	ReportingLSL Reporting · code 4G	Lead and Copper Rule Revisionscode 5200	No	Resolved
2024-10-17	Required treatment not metLSL Inventory · code 2E	Lead and Copper Rule Revisionscode 5200	Yes	Resolved
2020-05-05	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2013-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2013-07-13	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2013-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2013-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2013-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2012-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2012-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

City of Mercedes: frequently asked questions

Who runs City of Mercedes?

City of Mercedes (PWSID TX1080007) is a community water system owned by a local government. It is regulated by the TX state drinking water program.

How many people does City of Mercedes serve?

City of Mercedes reports serving 16,258 people through 6,061 service connections in Hidalgo County, Texas.

Where does City of Mercedes get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does City of Mercedes have any drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is City of Mercedes' water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in December 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.

Where can I find City of Mercedes' water quality report?

As a community water system, City of Mercedes must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Hidalgo County

Water system	County	Population served	Type	Source
Mcallen Public Utility	Hidalgo	189,957	Community	Surface water
North Alamo WSC	Hidalgo	171,195	Community	Surface water
City of Edinburg	Hidalgo	85,224	Community	Surface water
City of Pharr	Hidalgo	79,715	Community	Surface water
City of Mission	Hidalgo	77,058	Community	Surface water
Sharyland WSC	Hidalgo	68,562	Community	Surface water

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “City of Mercedes, PWSID TX1080007, Texas”, https://aquacensus.com/water-systems/texas/city-of-mercedes-tx1080007 (data as of October 1, 2026).