Type of Water
Locality
Total Number
of Samples
Examined
10 cc or
16.6 cc
25 cc
less
(1)
(2)
(3)
(4)
(5)
(6)
Island
204
199
2
3
Raw
Mainland
54
43
2
9
Total
258
242
4
12
Island
201
74
19
42
66
Filtered but
Mainland
54
1
4
49
Duchlorinated,
Total
255
75
23
91
157
Filtered and
Island
206
204
2
Chlorinated. At Service Beservoirs.
Mainland
54
54
0
Total
260
258
2
Island
478
466
11
1
Filtered and Chlorinated. From Taps.
Mainland
206
203
2
1
Total
684
669
13
2
25
3.65%
[68]
ANNEX V.
SUMMARY OF WATER ANALYSES FOR THE YEAR 1947/48.
Bacteriological Analyses
Number and Percentage shewing B. Coli present in:—
33 cc 50 cc 100 cc Number and Percentage shewing B. Coli absent in 100 cc (7) (8) (9) (10) Physical & Chemical Analyses Total Number of Samples Examined Number and Percentage Found Satisfactory (12) (11) 101 24 125 2 45 19 100 12 21 16 24 54 2 66 35 124 1 1 20 184 98 97 99% 1 53 24 24 24 | 100% 1 0.38% 1 0.38% 21 8.08% 237 91.16% 122 121 99.18% 2 7 4 4 | 2 17 53 381 322 322 100% 16 165 75 0.30% 11 1.60% 6 | 0.88% 25 3.65% 69 10.09% 546 79.83% 397 397 75 | 100% 100%NOTE:
The majority of the samples shewing B. Coli present in 50 cc or less of filtered and chlorinated water came from three areas :— Shau Ki Wan, Waterloo Road and Kai Tak. In the case of these areas pollution was traced to defective piping and after repairs were carried out the samples were above standard. In the case of the few other bad samples the inside services were washed out and chlorinated.