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Table 1

Setting the Record Straight: Table 1

October 1, 1995

Ciba's estimates of atrazine contamination are higher than those in Tap Water Blues.

 

City/Source Population Ciba Estimate (PPB) EWG Estimate (PPB) EWG Estimate as a Percentage of Ciba Estimate (PPB)
Albia, IA 4,184 0.05 0 0%
Osceola, IA 3,750 6.08 1.18 19%
Akron, OH (Lake Rockwell) 280,000 0.56 0.14 25%
Columbus, OH (Scioto River) 320,000 2.02 0.67 33%
Clarinda, IA 5,991 0.71 0.25 35%
Des Moines, IA 191,003 0.37 0.13 35%
Mississippi River, LA 1,500,000 1.2 0.45 38%
Iowa City, IA 51,577 0.83 0.38 46%
Council Bluffs, IA 56,699 0.25 0.12 48%
Rathbun RWA, IA 16,888 2.3 1.95 83%
Davenport, IA 134,000 0.33 0.28 85%
Burlington, IA 32,405 0.3 0.28 93%
Ottumwa, IA 27,381 0.54 0.52 96%
Keokuk, IA 13,536 0.36 0.37 103%
Maumee River, OH 57,000 1.5 1.97 131%
Columbus, OH (Big Walnut Ck) 320,000 0.91 1.34 153%
Sandusky, River, OH 44,000 1.73 2.84 164%
Alum Creek, OH 45,000 0.62 1.93 311%
         
Average 3,033,414 1.15 0.82 71%

Sources: Wiles, Cohen, et al. "Tap Water Blues," Environmental Working Group, Washington, D.C. 1994.

Richards, et al. 1994. Atrazine exposures through drinking water: Exposure assessments for Ohio, Illinois, and Iowa. Proceedings of the Fourth National Conference on Pesticides. New Directions in Pesticide Research, Development, and Policy. Virginia Polytechnic Institute.

D. Tierney, et al. 1993. Atrazine and drinking water sources: An exposure assessment for popultions using the greater Mississippi River system. Ciba-Geigy Corporation Technical Report 2-93.