Public water system · TX1630004

Active

City of La Coste

At a glance

City of La Coste (PWSID TX1630004) is an active community water system in Medina County, Texas. It reports serving 1,488 people through 496 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; none is health-based, and the most recent began in October 2020.

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

Population served

1,488

Service connections

496

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDTX1630004

System typeCommunity water system

Activity statusActive

Population served1,488

Service connections496

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyMedina County

How does City of La Coste compare with other water systems in Medina County?

By EPA's size categories, City of La Coste is a small system (501 to 3,300 people). Medina County has 32 active public water systems. Its population served is about half of the county average of 2,764 people per system, and accounts for 1.7% of the 88,450 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 La Coste 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 5,215 Texas systems (74%) list groundwater as their primary source.

Who owns and regulates City of La Coste?

EPA lists City of La Coste 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. 20 of the 32 active systems in Medina County (63%) are also owned by a local government.

Does City of La Coste have drinking water violations?

EPA's records list 11 violations for this system; none is health-based, and the most recent began in October 2020. The violations listed here began between October 2008 and October 2020. By type: 11 monitoring and reporting. The contaminant or rule involved most often is Chlorine (6 of them). EPA lists 11 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
2020-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2020-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2016-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2014-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2013-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2013-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2013-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2010-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2010-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2009-06-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2008-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved

All 11 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 La Coste: frequently asked questions

Who runs City of La Coste?

City of La Coste (PWSID TX1630004) 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 La Coste serve?

City of La Coste reports serving 1,488 people through 496 service connections in Medina County, Texas.

Where does City of La Coste get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does City of La Coste have any drinking water violations?

EPA's records list 11 violations for this system; none is health-based, and the most recent began in October 2020. 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 La Coste'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. EPA's records list 11 violations for this system; none is health-based, and the most recent began in October 2020. 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 La Coste's water quality report?

As a community water system, City of La Coste 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 Medina County

Water system	County	Population served	Type	Source
Benton City WSC	Medina	32,000	Community	Groundwater
Yancey WSC	Medina	12,186	Community	Groundwater
City of Hondo	Medina	11,044	Community	Groundwater
East Medina County Sud Unit 1	Medina	6,153	Community	Groundwater
City of Devine	Medina	4,335	Community	Groundwater
City of Castroville	Medina	3,913	Community	Groundwater

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, “City of La Coste, PWSID TX1630004, Texas”, https://aquacensus.com/water-systems/texas/city-of-la-coste-tx1630004 (data as of October 1, 2026).