The TCEQ now offers near real-time water quality data from stations located within selected river basins of the state. Each station is equipped to continuously monitor both physical water quality parameters and chemical constituents.

Select a highlighted river basin from the map below to retrieve a monthly summary of hourly data collected at TCEQ's water monitoring stations. These monitoring stations sample the water stream once every fifteen minutes. Hourly averages are then calculated from these fifteen-minute averages.

Although this is the most current data, it is not considered official until it has been certified by the TCEQ technical staff. Only data from TCEQ monitoring sites or monitoring entities that are partnered with the TCEQ is available via this web page. This information is updated hourly.

1 - Canadian River 2 - Red River 3 - Sulphur River 4 - Cypress River 5 - Sabine River 6 - Neches River 7 - Neches-Trinity Coastal 8 - Trinity River 9 - Trinity-San Jacinto Coastal 10 - San Jacinto River 11 - San Jacinto-Brazos Coastal 12 - Brazos River 13 - Brazos-Colorado Coastal 14 - Colorado River 15 - Colorado-Lavaca Coastal 16 - Lavaca River 17 - Lavaca-Guadalupe Coastal 18 - Guadalupe River 19 - San Antonio River 20 - San Antonio-Nueces Coastal 21 - Neuces River 22 - Nueces-Rio Grande Coastal 23 - Rio Grande River

This web page provides the most current hourly averaged data available. Our convention for time-tagging data is the beginning of each hour. For example, values shown for the noon hour are based on measurements taken from noon to 1:00 p.m. The noon average will not be calculated until after 1:00 p.m. The noon average will then be available on our external server from 1:15 p.m. to 1:30 p.m. This results in an apparent one-hour time lag in the data. We also present our data in Local Standard Time for each measuring site. During Daylight Savings, this introduces another apparent one-hour time lag in the data.