The State of Texas and the U.S. Environmental Protection Agency have established stream standards for temperature, dissolved oxygen, total dissolved solids, and pH for most water bodies in the state. Standards vary according to geographic location and according to the established uses of the water body. Conductivity values in the following table were converted from total dissolved solids (TDS) using the conversion: TDS (mg/L)/0.67 = Conductivity (µS/cm). Conductivity is rounded in the following table.


COLORADO RIVER BASIN STANDARDS:
Segment # Segment Name TDS/Specific Conductance (mg/L/µS/cm) Dissolved Oxygen (mg/L) pH Range (SU) Temperature F/C
1421 Concho River 1,600/2390 5 6.5-9.0 90/ 32.2
1416 San Saba River 425/630 5 6.5-9.0 90/ 32.2
1415 Llano River 350/520 5 6.5-9.0 91/32.8
1414 Pedernales River 525/780 5 6.5-9.0 91/32.8
1412 Colorado River Below Lake J. B. Thomas 20,000/29,850 5 6.5-9.0 93/33.9
1409 Colorado River Above Lake Buchanan 900/1340 5 6.5-9.0 91/32.8
1408 Lake Buchanan 600/900 5 6.5-9.0 90/32.2
1406 Lake LBJ 500/750 5 6.5-9.0 94/34.4
1404 Lake Travis 400/600 6 6.5-9.0 90/32.2
1403 Lake Austin 400/600 5 6.5-9.0 90/32.2
1428 Colorado River Below Town Lake 500/750 5-6 6.5-9.0 95/35
1402 Colorado River Below La Grange 500/750 5 6.5-9.0 95/35
1502 Tres Palacios Creek Above Tidal 800/1190 5 6.5-9.0 90/32.2
1401 Colorado River Tidal ** 4 6.5-9.0 95/35
  *depending on flow **salinity is measured in tidal zones.