Public water system · TX0310031

Active

East Rio Hondo WSC Arroyo City

At a glance

East Rio Hondo WSC Arroyo City (PWSID TX0310031) is an active community water system in Cameron County, Texas. It reports serving 1,953 people through 651 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011.

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

Population served

1,953

Service connections

651

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDTX0310031

System typeCommunity water system

Activity statusActive

Population served1,953

Service connections651

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyCameron County

How does East Rio Hondo WSC Arroyo City compare with other water systems in Cameron County?

By EPA's size categories, East Rio Hondo WSC Arroyo City is a small system (501 to 3,300 people). Cameron County has 30 active public water systems. Its population served is well below the county average of 14,775 people per system, and accounts for 0.4% 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 East Rio Hondo WSC Arroyo City is well 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 1,192 Texas systems (17%) list purchased surface water as their primary source.

Who owns and regulates East Rio Hondo WSC Arroyo City?

EPA lists East Rio Hondo WSC Arroyo City 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 East Rio Hondo WSC Arroyo City have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011. The violations listed here began between October 2011 and October 2011. By type: 12 monitoring and reporting. The contaminants or rules involved are Heptachlor epoxide, Endrin, Alachlor (Lasso) and Lindane (gamma-BHC). 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
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Heptachlor epoxidecode 2067	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Endrincode 2005	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Alachlor (Lasso)code 2051	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Lindane (gamma-BHC)code 2010	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Benzo(a)pyrenecode 2306	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Heptachlorcode 2065	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Chlordanecode 2959	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Pentachlorophenolcode 2326	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Methoxychlorcode 2015	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Toxaphenecode 2020	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Di(2-ethylhexyl) adipatecode 2035	No	Resolved
2011-10-01	Monitoring and reportingMonitoring, Regular · code 03	Hexachlorobenzenecode 2274	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.

East Rio Hondo WSC Arroyo City: frequently asked questions

Who runs East Rio Hondo WSC Arroyo City?

East Rio Hondo WSC Arroyo City (PWSID TX0310031) is a community water system owned by a local government. It is regulated by the TX state drinking water program.

How many people does East Rio Hondo WSC Arroyo City serve?

East Rio Hondo WSC Arroyo City reports serving 1,953 people through 651 service connections in Cameron County, Texas.

Where does East Rio Hondo WSC Arroyo City get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does East Rio Hondo WSC Arroyo City have any drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011. 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 East Rio Hondo WSC Arroyo City's 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, none is health-based, and the most recent began in October 2011. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.

Where can I find East Rio Hondo WSC Arroyo City's water quality report?

As a community water system, East Rio Hondo WSC Arroyo City 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

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “East Rio Hondo WSC Arroyo City, PWSID TX0310031, Texas”, https://aquacensus.com/water-systems/texas/east-rio-hondo-wsc-arroyo-city-tx0310031 (data as of October 1, 2026).