1. 52 NAWQA Study Areas

2. Occurrence in Water 010050 Streams Shallow Ground Water Streams Major Aquifers Percentage of Samples with Detections Land use Agricultural Urban Undeveloped Mixed

3. Common Pesticides in Streams Atrazine Metolachlor Cyanazine Simazine Prometon Tebuthiuron Diazinon Chlorpyrifos Carbaryl 010050010050 UrbanAgricultural Percentage of Samples with Detections

4. Organochlorines in Fish and Bed Sediment 010050 Fish Sediment Fish Sediment Percentage of Samples with Detections Land use Agricultural Urban Undeveloped Mixed

5. Common Organochlorine Compounds in Fish Tissue 010050010050 UrbanAgricultural Percentage of Samples with Detections DDT Chlordane Dieldrin

6. Measured Atrazine in Streams

7. Prediction of Atrazine in Streams

8. Trends in Corn-Belt Herbicides 0.001 0.01 0.1 1 0.001 0.01 0.1 1 19921994199619982000 Cyanazine Alachlor Acetochlor Herbicide Use Stream Concentrations

9. Frequency of Mixtures 2 Number of Pesticides in Sample 46810 0 50 100 Percentage of Samples with Equal or Greater Number 13579 75 50 25 75% have 5 or more 25% have 10 or more

10. Potential to Affect Humans 010050 Streams Ground Water Streams Major Aquifers Percentage of Sites Exceeding Benchmarks Agricultural Urban Undeveloped Mixed

11. Potential to Affect Aquatic Life 010050 Water Bed Sediment Water Bed Sediment Percentage of Sites Exceeding Benchmarks Agricultural Urban Undeveloped Mixed

12. Pesticides with Exceedances of Aquatic-Life Benchmarks Diazinon Chlorpyrifos Azinphos-Methyl 0 100 50 Percentage of Sites Exceeding Benchmarks Agriculture Urban 0 100 50 20 Pesticides with Exceedances (57% Sites) 10 Pesticides with Exceedances (83% Sites)

13. Trends in Urban Streams 1993-19941995-19971998-20001993-19941995-19971998-20001993-19941995-19971998-2000 0 50 100 Sampling Period Percentage of Sites ChlorpyrifosMalathionDiazinon

14. Potential to Affect Wildlife 010050 Percentage of Sites Exceeding Benchmarks Organochlorines In Whole Fish Agricultural Urban Undeveloped Mixed

15. Declining DDT in Fish 1969 500 0 1000 197419791984198919941999 Concentration Median DDT Wildlife Benchmark