Estimated HM doses taken into the human body through digestive route Dose / day HMs D (mg / kg / day) TDI (mg / kg / day) No sample over TDI n (%) Arsenic 0.0031 ± 0.0006 0.002 114 (51.35) Lead 0.0030 ± 0.0041 0.003 144 (64.86) Cadimium 0.0012 ± 0.0004 0.060 0 (0) Chromium 0.0066 ± 0.0078 0.300 0 (0) 14 51.53% and 64.86% of households using well water which contaminated with As and Pb for drinking with D > TDI, respectively.