Public water system · TX0310004

Active

City of Los Fresnos

At a glance

City of Los Fresnos (PWSID TX0310004) is an active community water system in Cameron County, Texas. It reports serving 6,009 people through 2,003 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 July 2025.

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

Population served

6,009

Service connections

2,003

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDTX0310004

System typeCommunity water system

Activity statusActive

Population served6,009

Service connections2,003

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyCameron County

How does City of Los Fresnos compare with other water systems in Cameron County?

By EPA's size categories, City of Los Fresnos is a medium system (3,301 to 10,000 people). Cameron County has 30 active public water systems. Its population served is about 59% below the county average of 14,775 people per system, and accounts for 1.4% of the 443,241 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 Los Fresnos is about 10% below 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 Los Fresnos?

EPA lists City of Los Fresnos 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 30 active systems in Cameron County (70%) are also owned by a local government.

Does City of Los Fresnos have drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in July 2025. The violations listed here began between July 2016 and July 2025. By type: 5 public notice, recordkeeping or other, 5 required treatment not met, 1 reporting and 1 monitoring and reporting. The contaminant or rule involved most often is Public Notice (5 of them). EPA lists 12 as resolved. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2025-07-02	ReportingNotification, Known or Potential LSL · code 4H	Lead and Copper Rule Revisionscode 5200	No	Resolved
2016-10-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-10-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2016-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2016-09-07	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-09-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2016-08-31	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-08-27	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-08-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2016-08-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2016-07-31	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-07-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	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 Los Fresnos: frequently asked questions

Who runs City of Los Fresnos?

City of Los Fresnos (PWSID TX0310004) 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 Los Fresnos serve?

City of Los Fresnos reports serving 6,009 people through 2,003 service connections in Cameron County, Texas.

Where does City of Los Fresnos 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 Los Fresnos 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 July 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 Los Fresnos' 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 July 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 Los Fresnos' water quality report?

As a community water system, City of Los Fresnos 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 Cameron County

Water system	County	Population served	Type	Source
Brownsville Public Utilities Board	Cameron	201,249	Community	Surface water
Harlingen Water Works System	Cameron	85,900	Community	Surface water
Laguna Madre Water District	Cameron	46,674	Community	Surface water
East Rio Hondo WSC	Cameron	24,756	Community	Surface water
City of San Benito	Cameron	24,250	Community	Surface water
El Jardin WSC	Cameron	9,423	Community	Purchased 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 Los Fresnos, PWSID TX0310004, Texas”, https://aquacensus.com/water-systems/texas/city-of-los-fresnos-tx0310004 (data as of October 1, 2026).