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Table 6.9 Pesticides and their degradation products in samples collected during the summer of 1995 from 106 municipal wells in Iowa.
After Kolpin et al. (1997).
Compound Per cent Reporting Maximum Maximum Health Use or origin
detection limit concentration contaminant level* advisory level*
−1
−1
−1
−1
(mgL ) (mgL ) (mgL ) (mgL )
Alachlor-ESA† 65.1 0.10 14.8 – – Alachlor degradation product
Atrazine 40.6 0.05 2.13 3.0 3.0 Herbicide
Deethylatrazine 34.9 0.05 0.59 – – Triazine degradation product
(atrazine, propazine)
Cyanazine amide 19.8 0.05 0.58 – – Cyanazine degradation product
Metolachlor 17.0 0.05 11.3 – 70 Herbicide
Prometon 15.1 0.05 1.0 – 100 Herbicide
Deisopropylatrazine 15.1 0.05 0.44 – – Triazine degradation product
(atrazine, cyanazine, simazine)
Alachlor 7.5 0.05 0.63 2.0 – Herbicide
Cyanazine 5.7 0.05 0.30 – 1.0 Herbicide
Acetochlor 0.9 0.05 0.77 – – Herbicide
Metribuzin 0.9 0.05 0.27 – 100 Herbicide
Ametryn 0.0 0.05 – – 60 Herbicide
Prometryn 0.0 0.05 – – – Herbicide
Propachlor 0.0 0.05 – – 90 Herbicide
Propazine 0.0 0.05 – – 10 Herbicide
Simazine 0.0 0.05 – 4 4 Herbicide
Terbutryn 0.0 0.05 – – – Herbicide
* US Environmental Protection Agency.
† Alachlor ethanesulfonic acid.

Table 6.10 Summarized analytical results of pesticides in Chalk boreholes in the Granta catchment, Cambridgeshire. After Gomme
et al. (1992).
−1
Site Number of samples Pesticides detected Number of detections Concentration range (mgL )
Babraham 3 Atrazine 3 <l.q.–0.07
Simazine 2 <l.q.
Sawston 3 Atrazine 3 <l.q.–0.13
Simazine 3 <l.q.–0.07
Linton 3 Atrazine 1 <l.q.
Fleam Dyke 3 n.d. – –
45/12 1 Atrazine 1 0.31
Simazine 1 0.40
45/17 1 n.d. – –
54/28 1 n.d. – –
54/99 1 n.d. – –
54/101 1 Simazine 1 <l.q.
54/112 1 Atrazine 1 <l.q.
54/116 3 Atrazine 2 0.05–0.06
Chlortoluron 2 0.17–0.35
Isoproturon 2 0.49–0.61
Simazine 3 0.09–0.12
54/119 1 Chlortoluron 1 <l.q.
Isoproturon 1 <l.q.
Simazine 1 0.05
55/84 1 Simazine 1 <l.q.
64/40 1 n.d. – –

n.d., none detected; <l.q., below limit of quantification.