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Arsenic concentrations by depth of tubewells in three seasons
| Depth (feet) of tubewells | No. of tubewells | Mean (standard deviation) arsenic concentration (μg/L) | ||
|---|---|---|---|---|
| Summer 2003 | Monsoon 2003 | Winter 2003 | ||
| ≤60 | 21 | 622 (486) | 766 (842) | 660 (585) |
| 61–100 | 33 | 729 (338) | 1063 (898) | 940 (702) |
| >100 | 20 | 714 (418) | 796 (646) | 693 (580) |
| All | 74 | 694 (403) | 906 (822) | 794 (644) |
