of 0.4 ug/l . Atrazine concn averaged 1.6 ng/g and 77% of the Canadian streams tested positive for atrazine at entry points to the Great Lakes with a maximum atrazine level of 26.0 ng/g . DRINKING WATER: The 7 day average concn of atrazine in 3 New Orleans LA drinking water supplies ranged from 4.9 to 5.4 ug/l . Atrazine in Iowa's drinking water supplies from the South Skunk, Racoon, Desmoines, and Rathburn Rivers, Red Rock Reservoir, 3 municipal wells of Demoines, Davenport and Iowa City, and 4 raw drinking water wells ranged in concn from NA-12,000, 120-3300, 50-800, 165-3750, 100-1900, 60-405 and 4-483 ng/l, respectively . The South Skunk, Racoon, Desmoines, and Rathburn Rivers and Red Rock Reservoir maintained respective average atrazine concn of 200, 814, 211, 1285 and 921 ng/l . GROUNDWATER: In corn producing regions of Nebraska, atrazine was found in ground water at concn ranging from 200 to 800 ng/l . Concn of atrazine in 14 irrigation wells in central Nebraska ranged from 0.06 to 3.12 ug/l . Atrazine was applied to plots which were drained by tiles. Water samples were collected & analyzed. Concn during the first season ranged from 0.000 to 0.68 ug/l. The deethylated metabolite, 2-chloro-4-isopropylamino-6-amino-s-triazine, was detected at similar concn. SURFACE WATER: A SURVEY OF AGRICULTURAL WATERSHEDS IN SOUTHERN ONTARIO, 1975-1977, NEAR LAND DEVOTED TO CORN PRODN TREATED WITH ATRAZINE MEAN RATE OF 1.7 KG/HA, WAS CONDUCTED. STREAMS WERE GAUGED & WATERS MONITORED. ATRAZINE & ITS METABOLITE DESETHYLATRAZINE WERE DETECTED IN 80% OF STREAM WATERS 1.4 UG/L.
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