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Water in the upper Trinity River basin upstream of the Dallas-Fort Worth metroplex is generally a calcium bicarbonate type water. Average dissolved solids (DS) concentrations during the study period ranged from 174 mg/L in the Elm Fork Trinity River near Lewisville to 682 mg/L in Mountain Creek near Cedar Hill. Upstream of the municipal waste effluents in the Dallas-Fort Worth metroplex, average dissolved oxygen (DO) concentrations generally exceed 7.0 mg/L, average DO percent saturation values generally exceed 70%, and average biochemical oxygen demand (BOD) concentrations generally were 12.0 mg/L. Average concentrations of total nitrogen and total phosphorus increase significantly downstream of municipal waste effluents in the Dallas-Fort Worth metroplex. Lead has been detected in excess of the 50 micrograms/L maximum contaminant level, and iron has been detected in excess of the 300 micrograms secondary maximum contaminant level at two sites on streams in the study area. 29 refs., 27 figs., 20 tabs.

Areal and temporal variations in the quality of surface water in hydrologic accounting unit 120301, Upper Trinity River basin, Texas