Public water system · TX2460157

Active

Sonterra MUD

At a glance

Sonterra MUD (PWSID TX2460157) is an active community water system in Williamson County, Texas. It reports serving 16,614 people through 9,221 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in December 2024.

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

Population served

16,614

Service connections

9,221

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDTX2460157

System typeCommunity water system

Activity statusActive

Population served16,614

Service connections9,221

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyWilliamson County

How does Sonterra MUD compare with other water systems in Williamson County?

By EPA's size categories, Sonterra MUD is a large system (10,001 to 100,000 people). Williamson County has 51 active public water systems. Its population served is about 21% above the county average of 13,777 people per system, and accounts for 2.4% of the 702,636 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 Sonterra MUD is about 148% 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. 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 Sonterra MUD?

EPA lists Sonterra MUD 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. 33 of the 51 active systems in Williamson County (65%) are also owned by a local government.

Does Sonterra MUD have drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in December 2024. The violations listed here began between April 2012 and December 2024. By type: 7 monitoring and reporting, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (4 of them). EPA lists 10 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
2024-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2024-07-03	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2024-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2023-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2018-07-01	Monitoring and reportingWater Quality Parameter M/R · code 53	Lead and Copper Rulecode 5000	No	Resolved
2018-07-01	Monitoring and reportingWater Quality Parameter M/R · code 53	Lead and Copper Rulecode 5000	No	Resolved
2018-07-01	Monitoring and reportingWater Quality Parameter M/R · code 53	Lead and Copper Rulecode 5000	No	Resolved
2017-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Fluoridecode 1025	Yes	Resolved
2017-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Fluoridecode 1025	Yes	Resolved
2012-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved

All 10 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.

Sonterra MUD: frequently asked questions

Who runs Sonterra MUD?

Sonterra MUD (PWSID TX2460157) is a community water system owned by a local government. It is regulated by the TX state drinking water program.

How many people does Sonterra MUD serve?

Sonterra MUD reports serving 16,614 people through 9,221 service connections in Williamson County, Texas.

Where does Sonterra MUD 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 Sonterra MUD have any drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in December 2024. 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 Sonterra MUD'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 10 violations for this system; 2 are health-based, and the most recent began in December 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.

Where can I find Sonterra MUD's water quality report?

As a community water system, Sonterra MUD 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 Williamson County

Water system	County	Population served	Type	Source
City of Georgetown	Williamson	191,639	Community	Surface water
City of Round Rock	Williamson	130,662	Community	Surface water
City of Leander	Williamson	98,330	Community	Surface water
City of Cedar Park	Williamson	86,939	Community	Surface water
Jonah Water Sud	Williamson	29,861	Community	Purchased surface water
City of Hutto	Williamson	29,580	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, “Sonterra MUD, PWSID TX2460157, Texas”, https://aquacensus.com/water-systems/texas/sonterra-mud-tx2460157 (data as of October 1, 2026).