60
TABLE IV
QUALITY OF WATER.
Summary of Water Analyses for 1948/49.
Bacteriological Analyses
Number shewing B. Coli present in :--
Type of Water Locality Total No. of Samples examined Number shewing B. Coli absent in 100 cc. Number & Percentage Raw Island 198 186 11 Mainland 53 46 7 Total 251 232 19 Filtered but Unchlorinated Island 197 80 15 31 1 51 Mainland 53 35 2 1 12 12 20 Total 250 82 16 43 1 71 Filtered and Chlorinated. At Service Reservoirs. Island 223 3 1 Mainland 55 1 Total 278 3 2 10 3 Filtered and Chlorinated. From Taps Island 477 383 2 10 19 18 93 242 117 Mainland 205 92 92 24 24 77 116 116 Total 682 8 1 37 3 6 210 94% 102 102 2 52 95% 24 24 8 262 94% 126 126 6 10 42 1222 411 86% 234 234 1 6 16 179 87% 44 44 2 7 16 58 590 278 278 87%STANDARDS OF PURITY AIMED AT —
Raw water B. Coli absent in 22 cc.
Filtered unchlorinated water B. Coli absent in 50 cc. Filtered and chlorinated water B. Coli absent in 100 cc.
Note: Where bad tap samples were found the services were washed out and chlorinated.