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Figure 2.7 <br />California faces numerous water quality problems <br />Fresno <br />Redding <br />San Diego <br />Sacramento <br />Los Angeles <br />San Francisco <br /> <br /> <br /> <br /> <br /> <br />mi0 50 100 150 <br />km0 80 160 240 <br />Water quality hot spots <br />Temperature and sediment <br />Mercury and other heavy metals <br />Phosphorus <br />Pathogens and nutrients <br />Sediment and nutrients <br />Pesticides and nutrients <br />Salts <br />Nutrients <br />Metals and salts <br />Nitrates <br />Nutrients, metals, and pathogens <br />Pesticides <br />Klamath River <br />temperature, sediment, nutrient and <br />dissolved oxygen TMDLs; major tributaries <br />also suer from similar impairments <br />Russian River <br />pathogen TMDL; major <br />tributaries also suer <br />from dissolved oxygen, <br />nitrogen, phosphorus, <br />sediment, temperature, <br />and mercury impairments <br />San Joaquin River <br />boron, DDT, mercury, <br />selenium, and toxaphene TMDLs, <br />among many stressors <br />Santa Ana River <br />salinity, heavy metals, <br />and pathogens are the <br />main TMDL stressors <br />Colorado River region <br />salinity <br />Los Angeles River <br />ammonia, cadmium, copper, <br />lead, nutrients, pH, selenium, <br />and zinc TMDLs <br />Salinas River <br />nitrates, nutrients, <br />chlorides, pathogens, <br />pesticides, and <br />many other stressors <br />Salinity <br />intrusion <br />sOURcE: Authors’ calculations using data from the state Water Resources control board. <br />NOTE: The map highlights only major regional problems, including those for which total maximum daily loads (TMdLs) have <br />been set by water quality regulators.