Public water system record

Guadalupe Blanco River Authority

On record as serving Calhoun County, TX · Population served not reported

Federal records show 11 health-based violations and 10 monitoring/reporting issues for Guadalupe Blanco River Authority in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

TX0290005
CYPRESS
TX
0 served

System profile

Source water Surface water

ZIP 77429

EPA system ID TX0290005

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 11
Resolved: 2
Unresolved: 1
Archived by EPA: 8
Any acute record: Yes
Monitoring issues, last 10 years: 10

Key facts

Guadalupe Blanco River Authority draws water from 1 surface water intake.
Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2023.
Record on file since 2006, with 0 health-based violations before October 19, 2016.

Check whether Guadalupe Blanco River Authority serves your address

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 0.083 mg/L, federal limit 0.08 mg/L (at or just above 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 0.091 mg/L, federal limit 0.08 mg/L (1.1 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
Interim Enhanced Surface Water Treatment Rule Treatment technique failure	120	Apr 1, 2025	Resolved	Yes
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 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
LEAD AND COPPER RULE REVISIONS Treatment technique failure	350	Oct 17, 2024	Active	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	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 0.093 mg/L, federal limit 0.08 mg/L (1.2 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 0.084 mg/L, federal limit 0.08 mg/L (1.1 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 0.094 mg/L, federal limit 0.08 mg/L (1.2 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 0.097 mg/L, federal limit 0.08 mg/L (1.2 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 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)	220	Apr 1, 2023	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	Oct 31, 2025	Resolved
Public Notice OTHER	May 31, 2025	Resolved
Public Notice OTHER	May 1, 2025	Active
Public Notice OTHER	Apr 19, 2025	Resolved
LEAD AND COPPER RULE REVISIONS RPT	Oct 17, 2024	Active
Revised Total Coliform Rule Monitoring violation	Feb 1, 2024	Resolved
Total Trihalomethanes (TTHMs) Monitoring and reporting	Dec 26, 2023	Resolved
Total Trihalomethanes (TTHMs) Monitoring and reporting	Aug 29, 2023	Resolved
Public Notice OTHER	Jul 15, 2023	Resolved
CARBON, TOTAL Monitoring and reporting	Jan 1, 2023	Resolved

Full record since 2006

EPA's records for Guadalupe Blanco River Authority go back to 2006. Before October 19, 2016 they list no health-based violations and 2 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
2000s	0	1
2010 to October 18, 2016	0	1
2020s	11	10

What the violations mean

Total Trihalomethanes (TTHMs)

9 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Interim Enhanced Surface Water Treatment Rule

1 incident

The system did not meet a filtration or treatment requirement for surface water

Inadequate treatment of surface water can let pathogens such as Cryptosporidium and Giardia through

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Guadalupe Blanco River Authority draws water from 1 surface water intake. 2 other community water systems buy water from Guadalupe Blanco River Authority.

Community systems that buy water from it

City of Port Lavaca Port Lavaca, TX
Gbra Calhoun County Rural Water System Cypress, TX

Annual water quality report

Guadalupe Blanco River Authority 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.

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