Public water system · TX1500037

Active

Lake Buchanan

At a glance

Lake Buchanan (PWSID TX1500037) is an active community water system in Llano County, Texas. It reports serving 2,484 people through 828 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in February 2021.

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

Population served

2,484

Service connections

828

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDTX1500037

System typeCommunity water system

Activity statusActive

Population served2,484

Service connections828

Primary water sourceSurface water

Owner typePrivate

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyLlano County

How does Lake Buchanan compare with other water systems in Llano County?

By EPA's size categories, Lake Buchanan is a small system (501 to 3,300 people). Llano County has 22 active public water systems, and Lake Buchanan is the 4th-largest of them by population served. Its population served is about 42% above the county average of 1,755 people per system, and accounts for 6.4% of the 38,598 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 Lake Buchanan is about 63% 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 Lake Buchanan?

EPA lists Lake Buchanan as privately owned. 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. 12 of the 22 active systems in Llano County (55%) are also privately owned.

Does Lake Buchanan have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in February 2021. The violations listed here began between August 2005 and February 2021. By type: 6 contaminant level above the legal limit, 5 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (4 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
2021-02-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2021-02-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2021-02-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2021-02-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Long Term 2 Enhanced Surface Water Treatment Rulecode 0800	No	Resolved
2019-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2019-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2019-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2019-06-23	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2019-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2005-08-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	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.

Lake Buchanan: frequently asked questions

Who runs Lake Buchanan?

Lake Buchanan (PWSID TX1500037) is a community water system privately owned. It is regulated by the TX state drinking water program.

How many people does Lake Buchanan serve?

Lake Buchanan reports serving 2,484 people through 828 service connections in Llano County, Texas.

Where does Lake Buchanan 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 Lake Buchanan have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in February 2021. 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 Lake Buchanan'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, 6 are health-based, and the most recent began in February 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.

Where can I find Lake Buchanan's water quality report?

As a community water system, Lake Buchanan 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 Llano County

Water system	County	Population served	Type	Source
Kingsland WSC	Llano	12,975	Community	Surface water
City of Horseshoe Bay	Llano	12,729	Community	Surface water
City of Llano	Llano	3,352	Community	Surface water
Tpwd Enchanted Rock Sna	Llano	885	Transient non-community	Groundwater
Camp Longhorn Main Camp	Llano	800	Transient non-community	Surface water
City of Sunrise Beach Village	Llano	791	Community	Groundwater

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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, “Lake Buchanan, PWSID TX1500037, Texas”, https://aquacensus.com/water-systems/texas/lake-buchanan-tx1500037 (data as of October 1, 2026).