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  Assessment Summary   2006 Texas Water Quality Inventory and 303(d) List (June 27, 2007)  The Texas Water Quality Inventory is prepared by the Texas Commission on Environmental Quality (TCEQ) and submitted to the United States Environmental Protection Agency (EPA) biennially on even numbered years in accordance with Section 305(b) of the Clean Water Act (CWA). Due to the enabling legislation, the Inventory is often called the 305(b) report. The 305(b) report allows the public, local governments, state agencies, the Texas Legislature, the EPA, and Congress to evaluate water quality in Texas. Water bodies that do not support their Water quality standards, and for which existing controls are not adequate, are placed on the 303(d) list of impaired water bodies [as required under CWA Section 303(d)]. The report is also published on the TCEQ web site as the Texas Water Quality Inventory and 303(d) List.  The Inventory describes the status of all surface water bodies of the state that were evaluated for the given assessment period. The TCEQ uses data collected during the most recent five-year period in making its assessment. The data are gathered by many different organizations that all operate according to approved quality control guidelines and sample collection procedures. The quality of waters described in the Inventory represents a snapshot of conditions during the limited time period considered in the assessment. The period of record for water quality data and information used in the 2006 Inventory and List is December 1, 1999 to November 30, 2004.  Included as a companion document to this summary is a review of the trophic status of Texas reservoirs.  Because additional and more recent data are available for most of these reservoirs, all reservoirs were evaluated in a consistent manner using the last ten years of data.  A Groundwater Monitoring and Assessment component has also been updated for 2006 as a companion document to this summary.  Table 1 describes monitoring and assessment information compiled for each of Texas's major water body types:  streams, reservoirs, estuaries, and gulf waters. Overall use attainment status of uses for each of the water body types has been prepared and includes the recent assessment information developed for 2006.  See next page.                  Texas Commission on Environmental Quality              Page 1 of 9                         June 27, 2007      Table 1.  Overall Use Attainment for All Water Body Types   Streams  (Miles) Reservoir (Acres) Estuary (Square miles) Ocean Shoreline (Square miles) Total Unit Size in Texas 191,228 1,994,600 2,393 3,879 Monitoring Information Total unit size surveyed 22,776  12% 1,574,405 79% 2,082 87% 3,879 100% Total unit size not surveyed 168,452 88% 420,195 21% 311 13% 0 0% Assessment Information Total unit size assessed 21,044 11% 1567957 79% 2082 87% 3,879 100% Total unit size meeting one or more of its Uses 9298 5% 934992 47% 491 21% 0 0% Total unit size not supporting one or more of its Uses 11746 6% 632965 32% 1591 66% 3,879 100%  For each water body or portion of a water body where a designated use is not supported, the causes(s) were identified from available information and included in the Inventory.  Table 2 describes cause of impairments for each of Texas’s major waterbody types:  streams, reservoirs, estuaries, and gulf waters, as well as a total length or area for each cause.    Table 2.  Size of Waterbodies Impaired by Causes      Cause Streams (Miles) Reservoir (Acres) Estuary (Square Miles) Ocean Shoreline (Square Miles) aluminum in water 24       bacteria 4904 556 10 556bacteria (oyster waters)   421  chlordane in edible tissue 241     chloride 977     DDD in edible tissue 63      Texas Commission on Environmental Quality              Page 2 of 9                         June 27, 2007         Cause Streams (Miles) Reservoir (Acres) Estuary (Square Ocean Shoreline Miles) (Square Miles) DDE in edible tissue 63 26,992    DDT in edible tissue 63     depressed dissolved oxygen 1,669 2,731 265  dieldrin in edible tissue 129 38,914    dioxin in edible tissue 114 2,710 29  endrin in edible tissue 63 2,731    excessive algal growth 86 2,710    heptachlor epoxide in edible tissue 129 82,204    heptachlor in edible tissue 63 2,731    hexachlorobenzene in edible tissue 63     impaired fish community 224     impaired habitat 164     impaired macrobenthic community 175 2710    lead in water 70     lindane in edible tissue 63     mercury in edible tissue 43 4,679 2 3879mercury in water 3     PCBs in edible tissue 266  29  pH 121     selenium in water 126     sulfate 95 361,331    total dissolved solids 516     toxaphene in edible tissue 63 8,157    toxicity in sediment 4 68,057    toxicity in water 74     Texas Commission on Environmental Quality              Page 3 of 9                         June 27, 2007         Cause Streams (Miles) Reservoir (Acres) Estuary (Square Ocean Shoreline Miles) (Square Miles) zinc in edible tissue  116,074 29  zinc in water 3 41,464     Assessment Summary for Streams and Rivers  Stream Miles Surveyed in Texas191,22822,776168,4520500001000001500002000002500001MilesTotal Stream Miles in Texas Surveyed Not Surveyed   Overall Assessment Outcome for Streams and Rivers5 6890255075100Support CategoryPercentFully Supporting One or More Uses Impaired for One or More Uses Not Assessed   Texas Commission on Environmental Quality              Page 4 of 9                         June 27, 2007      Assessment Summary for Streams and Rivers (Continued)  Total Stream Miles Assessed per Use05,00010,00015,00020,00025,000Designated UseMilesFully Supporting Not Supporting Not Assessed Miles Surveyed Fully Supporting 13,783 8,723 788 8,688 12,072Not Supporting 1,961 4,893 396 0 1,285Not Assessed 7,033 9,094 21,592 86 9,419Miles Surveyed 22,776 22,710 22,776 8,774 22,776Aquatic Life Use Recreation (Contact and Non)Fish Consumption Public Water SupplyGeneral Uses   Assessment Summary for Reservoirs    Total Reservoir Acres Surveyed in Texas1,994,6001,574,405420,19505000001000000150000020000002500000AcresAcresTotal Reservoir Acres in Texas  Surveyed Not Surveyed           Texas Commission on Environmental Quality              Page 5 of 9                         June 27, 2007     Assessment Summary for Reservoirs (Continued)  Overall Assessment Outcome for Reservoirs4732210255075100Support CategoryPercent Fully Supporting One or More Uses  Not Supporting One or More Uses  Not Assessed    Total Reservoir Acres Assessed per Use0500,0001,000,0001,500,0002,000,000Designated UseAcresFully Supporting 845,383 691,639 247,782 1,506,715 1,232,926Not Supporting 83,763 26,992 369,488 0 192,121Not Assessed 645,259 855,774 957,136 0 149,358Miles Surveyed 1,574,405 1,574,405 1,574,405 1,506,715 1,586,967Aquatic Life Use Recreation (Contact and Non)Fish Consumption Public Water Supply General UsesFully Supporting Not Supporting Not Assessed Miles Surveyed          Texas Commission on Environmental Quality              Page 6 of 9                         June 27, 2007     Assessment Summary for Estuaries   Total Estuary Square Miles Surveyed in Texas2,0822,393311050010001500200025003000EstuarySquare MilesTotal Estuary Square Miles  Surveyed Not Surveyed      Overall Assessment Outcome for Estuaries2166130255075100Support CategoryPercentFully Supporting One or More Uses  Not Supporting One or More Uses Not Assessed    Texas Commission on Environmental Quality              Page 7 of 9                         June 27, 2007     Assessment Summary for Estuaries (Continued)  Total Estuary Square Miles Assessed per Use05001,0001,5002,0002,500Disignated UseSquare MilesFully Supporting 1,746 2,024 561 0 2,032 1,305Not Supporting 265 10 30 0 450Not Assessed 72 48 1,491 0 50 301Miles Surveyed 2,082 2,082 2,082 0 2,082 2,055Aquatic Life UseRecreation (Contact and Non)Fish ConsumptionPublic Water Supply General UsesOyster Water UseFully Supporting Not Supporting Not Assessed Miles Surveyed    Assessment Summary for Gulf of Mexico  Total Ocean Square Miles Surveyed in Texas3879 38790010002000300040005000Assessment StatusSquare MilesTotal Ocean Square Miles  Surveyed Not Surveyed     Texas Commission on Environmental Quality              Page 8 of 9                         June 27, 2007       Overall Assessment Outcome for Ocean Shoreline01000020406080100120Support CategoryPercentFully Supporting One or More Uses Not Supporting One or More Uses Not Assessed    Total Ocean Square Miles Assessed per Use02,0004,0006,000Designated UseSquare MilesFully Supporting 1,112 964 0 0 1,112 0Not Supporting 0 556 3,879 0 0 0Not Assessed 2,767 2,359 0 0 2,767 3,879Miles Surveyed 3,879 3,879 3,879 0 3,879 0Aquatic Life Use Recreation (Contact and Non)Fish Consumption Public Water SupplyGeneral Uses Oyster Water UseFully Supporting Not Supporting Not Assessed Miles Surveyed          Texas Commission on Environmental Quality              Page 9 of 9                         June 27, 2007   

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