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Sampling Data Definition
The TCEQ monitors the quality of surface water to evaluate physical, chemical, and biological characteristics of aquatic systems with reference to human health concerns, ecological condition, and designated uses. Data provide a basis for effective policies that promote the protection, restoration, and wise use of surface water in Texas.
TCEQ Sampling Data Query, Surface Water Quality Monitoring
Access Water Quality Data
Use H-GAC's Water Resources Information Map (WRIM) to locate Regional Monitoring Stations and access Water Quality Data.
Download TCEQ Quality Assured Datasets
Datasets on this page contain TCEQ Quality Assured ZIP data files for the seven assessment basins that intersect the H-GAC Region. Data can be downloaded as a text file.
Surface Water Monitoring Data by Basin
H-GAC updates the datasets occasionally throughout the year. If data prior to January 1, 1998 is needed, please reach out. For field descriptions and data reformatting instructions, please see Data Field Descriptions and Use.
Basin | Code | Text File Filename | Date Range | Updated |
---|---|---|---|---|
All H-GAC Region Data | AllBasins-txt.zip | 01/03/2000 - 02/25/2025 | 7/8/2025 | |
Bays and Estuaries | [24] | Basin24-txt.zip | 01/03/2000 - 02/12/2025 | 7/8/2025 |
Brazos-Colorado Coastal Basin | [13] | Basin13-txt.zip | 01/03/2000 - 12/16/2024 | 7/8/2025 |
Gulf of Mexico | [25] | Basin25-txt.zip | 01/06/2000 - 11/07/2024 | 7/8/2025 |
San Jacinto River Basin | [10] | Basin10-txt.zip | 01/03/2000 - 02/11/2025 | 7/8/2025 |
San Jacinto/Brazos Coastal Basin | [11] | Basin11-txt.zip | 01/05/2000 - 12/03/2024 | 7/8/2025 |
Trinity-San Jacinto Coastal Basin | [9] | Basin9-txt.zip | 03/08/2000 - 10/03/2024 | 7/8/2025 |
Surface Water Monitoring Data by County
County | Text File Filename | Date Range | Updated |
---|---|---|---|
Austin County | Austin.zip | 04/09/2013 - 07/07/2014 | 07/08/2025 |
Brazoria County | Brazoria.zip | 01/05/2000 - 12/03/2024 | 07/08/2025 |
Chambers County | Chambers.zip | 01/06/2000 - 11/13/2024 | 07/08/2025 |
Colorado County | Colorado.zip | 01/18/2001 - 10/15/2024 | 07/08/2025 |
Fort Bend County | Fort_Bend.zip | 02/29/2000 - 11/05/2024 | 07/08/2025 |
Galveston County | Galveston.zip | 01/06/2000 - 11/20/2024 | 07/08/2025 |
Grimes County | Grimes.zip | 12/11/2002 - 06/02/2004 | 07/08/2025 |
Harris County | Harris.zip | 01/03/2000 - 02/11/2025 | 07/08/2025 |
Liberty County | Liberty.zip | 01/25/2000 - 11/13/2024 | 07/08/2025 |
Matagorda County | Matagorda.zip | 01/03/2000 - 10/22/2024 | 07/08/2025 |
Montgomery County | Montgomery.zip | 01/04/2000 - 12/11/2024 | 07/08/2025 |
San Jacinto County | San_Jacinto.zip | 01/07/2000 - 11/19/2024 | 07/08/2025 |
Walker County | Walker.zip | 01/05/2000 - 11/19/2024 | 07/08/2025 |
Waller County | Waller.zip | 11/15/2000 | 07/08/2025 |
Wharton County | Wharton.zip | 01/05/2000 - 12/16/2024 | 07/08/2025 |