This survey was performed to investigate the degree of contamination and the significance of each item in drinking water, which was collected from rural villages between May and June 1990. The results of this survey were as follows.
1. The items that were over the criteria were temperature, NH3-N, N02-N, standard plate count (S.P.C) and coliform in the rural villages.
2. Total mean concentrations at Y-village were significantly higher than at S-village_ in colour, hardness, NH3-N, N02-N, standard plate count (S.P.C) and coliform, and significantly lower than at S-village in pH.
3. The percentages of total families to be over the criteria were 51.7% in pH, 36.0% in NH3 N, 91.0% in N02-N, 83.1% in standard plate count (S.P.C) and 59.6% in coliform, and in ´Y-village 78.8% in pH, 46.2% in NH3-N, 96.2% in N02-N, 100% in standard plate count and .63.5% in coliform.
4. The correlation coefficients with significant (p (0.001) difference between items were as follows
colour and N02-N r=0.9566 colour and NH3-N r=0.6777 colour and S.P.C. r=0.6855 hardness and N03-N r=0.8252 NH3-N and N02-N r=0.8238 S.P.C and N02-N r=0.7246 NH3-N and S.P.C r=.0.72315. The comparisons of results between first-test and second-test on the same family-drinking water were as follows.
? The first-test was very significantly lower in pH, very significantly higher in S.P.C. than the second-test.
NH3-N and N02-N were detected in first-test, and coliform was positive in both tests. In conclusion, these rural villages have many problems with their drinking water, especially so when it rains.
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