Basin 1  Canadian River Basin Basin 14   Colorado River Basin Basin 2  Red River Basin Basin 15   Colorado-Lavaca Coastal Basin Basin 3  Sulphur River Basin Basin 16   Lavaca River Basin Basin 4  Cypress River Basin Basin 17   Lavaca-Guadalupe Coastal Basin Basin 5  Sabine River Basin Basin 18   Guadalupe River Basin Basin 6  Neches River Basin Basin 19   San Antonio River Basin Basin 7  Neches-Trinity Coastal Basin Basin 20   San Antonio-Nueces Coastal Basin Basin 8  Trinity River Basin Basin 21   Nueces River Basin Basin 9  Trinity-San Jacinto Coastal Basin Basin 22   Nueces-Rio Grande Coastal Basin Basin 10   San Jacinto River Basin Basin 23   Rio Grande River Basin Basin 11   San Jacinto-Brazos Coastal Basin Basin 24   Bays and Estuaries Basin 12   Brazos River Basin Basin 25   Gulf of Mexico Basin 13   Brazos-Colorado Coastal Basin

TCEQ Region   1 TCEQ Region   9 TCEQ Region   2 TCEQ Region   10 TCEQ Region   3 TCEQ Region   11 TCEQ Region   4 TCEQ Region   12 TCEQ Region   5 TCEQ Region   13 TCEQ Region   6 TCEQ Region   14 TCEQ Region   7 TCEQ Region   15 TCEQ Region   8 TCEQ Region   16