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Summary of Well Water Sampling in California to Detect Pesticide Residues Resulting from Nonpoint-Source Applications

Environmental Monitoring and Pest Management Branch, Dep. of Pesticide Regulation, California EPA, 830 K Street Mall, Sacramento, CA 95814-3510

View larger version (79K): [in a new window]   Fig. 1. Sections with pesticide detections in wells sampled in Fresno and Tulare Counties, excluding 1,2-dibromo-3-chloropropane (DBCP), in (A) 1988, (B) 1990, (C) 1992, and (D) 1995

View larger version (27K): [in a new window]   Fig. 2. Concentrations of aldicarb sulfoxide and aldicarb sulfone (minimum detection limit [MDL] at 0.1–0.4 µg L-1) in a well sampled in northwestern California after aldicarb use was suspended in 1984

View larger version (31K): [in a new window]   Fig. 3. Concentration of 1,2-dibromo-3-chloropropane (DBCP) (minimum detection limit [MDL] at 0.01 µg L-1) in wells sampled in three different townships, in (A) T/R/S-14S22E23, (B) T/R/S-13S21E16, and (C) T/R/S-15S23E26. Wells were sampled after agricultural use was suspended in 1979

View larger version (36K): [in a new window]   Fig. 4. Comparison of the frequency distributions for concentrations of preemergence herbicide residues detected in California well water samples and attributed to nonpoint-source applications. (A) Simazine compared with bromacil and diuron; (B) simazine + 2-amino-4-chloro-6-ethylamino-s-triazine (ACET) + 2,4-diamino-6-chloro-s-triazine (DACT) compared with bromacil and diuron. Detection above minimum detection limits [MDLs], which range from 0.05 to 0.1 µg L-1

View larger version (83K): [in a new window]   Fig. 5. Areas where pesticide residues have been detected in California and their presence has been determined to result from nonpoint-source applications