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Arsenic concentrations by depth of tubewells in winter in 2002 and 2003
| Depth (feet) of tubewells | No. of tubewells | Mean (standard deviation) arsenic concentration (μg/L) | |
|---|---|---|---|
| Winter 2002 | Winter 2003 | ||
| ≤60 | 19 | 375 (288) | 635 (584) |
| 61–100 | 30 | 517 (363) | 996 (712) |
| >100 | 16 | 472 (298) | 708 (607) |
| All | 65 | 464 (328) | 820 (663) |
