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Public water system record

Sunset Bay

Serves an area of Aransas County, TX · 123 people served

Federal records show 10 health-based violations and 8 monitoring/reporting issues for Sunset Bay in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.

  • TX0040055
  • AUSTIN
  • TX
  • 123 served

System profile

Source water Groundwater
ZIP 78714
EPA system ID TX0040055

Verify this system on EPA ECHO →

Health-based violations, last 10 years
10
Resolved
1
Unresolved
0
Archived by EPA
9
Any acute record
No
Monitoring issues, last 10 years
8

Key facts

  • Sunset Bay draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.27 mg/L, federal limit 0.08 mg/L (3.4 times the limit), 2024.
  • Most recent formal enforcement: compliance order with a penalty by Texas, April 2025.
  • Lead pipe inventory: 0 lead and 0 unknown out of 42 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 0.128 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
 220 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.149 mg/L, federal limit 0.08 mg/L (1.9 times the limit)
 220 Jul 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.207 mg/L, federal limit 0.08 mg/L (2.6 times the limit)
 220 Apr 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.259 mg/L, federal limit 0.08 mg/L (3.2 times the limit)
 220 Jan 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.27 mg/L, federal limit 0.08 mg/L (3.4 times the limit)
 220 Oct 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.252 mg/L, federal limit 0.08 mg/L (3.2 times the limit)
 220 Jul 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.199 mg/L, federal limit 0.08 mg/L (2.5 times the limit)
 220 Apr 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.208 mg/L, federal limit 0.08 mg/L (2.6 times the limit)
 220 Jan 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.13 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
 220 Oct 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Apr 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
Public Notice
OTHER
 Nov 19, 2025 Active
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Nov 4, 2025 Active
Chlorine
Monitoring and reporting
 Jul 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Public Notice
OTHER
 Jun 10, 2025 Active
Public Notice
OTHER
 May 17, 2025 Resolved
Public Notice
OTHER
 Oct 5, 2019 Resolved
Public Notice
OTHER
 Apr 6, 2019 Resolved
Asbestos
Monitoring and reporting
 Jan 1, 2017 Resolved

Enforcement actions

Texas regulators took 1 formal enforcement action against Sunset Bay in 2025. The most recent was a compliance order with a penalty in April 2025.

Date By Action Violations covered
Apr 23, 2025 Texas Compliance order with a penalty 8 violations (8 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

10 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Sunset Bay draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).

Annual water quality report

Sunset Bay 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.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Sunset Bay for a copy.

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