Public water system · TX2460003
ActiveCity of Round Rock
At a glance
City of Round Rock (PWSID TX2460003) is an active community water system in Williamson County, Texas. It reports serving 130,662 people through 37,492 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in July 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
130,662
Service connections
37,492
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Round Rock compare with other water systems in Williamson County?
By EPA's size categories, City of Round Rock is a very large system (more than 100,000 people). Williamson County has 51 active public water systems, and City of Round Rock is the 2nd-largest of them by population served. Its population served is about 9.5 times the county average of 13,777 people per system, and accounts for 19% 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 City of Round Rock is about 19 times 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 Round Rock?
EPA lists City of Round Rock 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 City of Round Rock have drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in July 2011. The violations listed here began between October 2002 and July 2011. By type: 2 monitoring and reporting, 2 contaminant level above the legal limit and 1 required treatment not met. The contaminant or rule involved most often is Haloacetic acids (HAA5) (2 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2011-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2004-12-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2003-11-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2003-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2002-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
All 5 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 Round Rock: frequently asked questions
Who runs City of Round Rock?
City of Round Rock (PWSID TX2460003) 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 Round Rock serve?
City of Round Rock reports serving 130,662 people through 37,492 service connections in Williamson County, Texas.
Where does City of Round Rock 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 Round Rock have any drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in July 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 City of Round Rock'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 5 violations for this system; 3 are health-based, and the most recent began in July 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 City of Round Rock's water quality report?
As a community water system, City of Round Rock 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 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 |
| City of Taylor | Williamson | 20,622 | 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 Round Rock, PWSID TX2460003, Texas”, https://aquacensus.com/water-systems/texas/city-of-round-rock-tx2460003 (data as of October 1, 2026).