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Public water system record

Lake Buchanan

Serves an area of Llano County, TX that includes Buchanan Dam · 2,484 people served

Federal records show 6 health-based violations and 5 monitoring/reporting issues for Lake Buchanan in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • TX1500037
  • AUSTIN
  • TX
  • 2,484 served

System profile

Source water Surface water
ZIP 78714
EPA system ID TX1500037

Verify this system on EPA ECHO →

Health-based violations, last 10 years
6
Resolved
6
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
5

Key facts

  • Lake Buchanan draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.104 mg/L, federal limit 0.08 mg/L (1.3 times the limit), 2019.
  • Most recent formal enforcement: compliance order with a penalty by Texas, December 2020.
  • Record on file since 2004, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 369 unknown out of 744 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Oct 1, 2019 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.071 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 220 Jul 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.104 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
 220 Jul 1, 2019 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.063 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Apr 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Apr 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jan 1, 2019 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Feb 1, 2021 Resolved
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Feb 1, 2021 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Feb 1, 2021 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Feb 1, 2021 Resolved
Public Notice
OTHER
 Jun 23, 2019 Resolved

Full record since 2004

EPA's records for Lake Buchanan go back to 2004. Before October 19, 2016 they list no health-based violations and 3 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2000s 0 3
October 19, 2016 to 2019 6 1
2020s 0 4

Enforcement actions

Texas regulators took 1 formal enforcement action against Lake Buchanan in 2020. The most recent was a compliance order with a penalty in December 2020.

Date By Action Violations covered
Dec 21, 2020 Texas Compliance order with a penalty 6 violations (6 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

4 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Haloacetic Acids (HAA5)

2 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Where the water comes from

Lake Buchanan draws water from 1 surface water intake. 2 other community water systems buy water from Lake Buchanan.

Community systems that buy water from it

Annual water quality report

Lake Buchanan must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Texas.

Certified drinking water labs by state EPA guidance for private wells