... LAUER, AND H P NICHOLSON 1964 Water pollution by insecticides in an agricultural river basin II The zooplankton, bottom fauna, and fish Limnol Oceanog., 9: 318-323 B;~UMLEH, INSECTICIDE POLLUTION ... Measurement of organic contaminants in the nation’s rivers Ind Eng IN A RIVER: TIIE WATER 317 Chem., 52 ( 6) : 99A-102A 1959 ROSEN, A A., AND F M MIDDLETON Chlorinated insecticides in surface waters Anal ... nondetcctable level before reaching the water treatment plant SUMMARY Chronic contamination by toxaphene and BHC was observed at a municipal water plant in treated and untreated river water Samples taken...