Ground water table of Coastal dry zone areas in Sri Lanka is exposed to fecal contamination due to the typically used human excreta disposal method of pit – latrines. Though there available standards and commonly accepted factors regulating the construction of shallow wells in the proximity of pit latrines, fecal contamination continuously been a burden to the dry zone coastal areas. This research consider ‘depth of the water table’, ‘gap of infiltration layer’, ‘depth of the latrine pit’ and ‘the distance between dug well and latrine pit’ on preventing ground water fecal contamination, taking Kalpitiya Peninsula of Sri Lanka as the case study. On the derived results the paper concludes that the considered commonly accepted factors are not the determining factors of fecal contamination in coastal land strips alike the case study area. The results suggest more attention on site specific reasons on developing standards to prevent ground water fecal contamination.