1974-1975

(a) Chemical quality (values expressed in parts per million)

1973-74 1974-75

Range Average Range Average Total hardness (as CaCO3) 10-64 28 10-55 31 Salinity (as NaCl) 10-168 40 8-97 39 Total dissolved solids 30-240 75 23-148 73 Fluorides (as F) 0.8 0.8

(Target level 1.0 p.p.m.)

(b) Bacteriological quality

1973-74 No. taken orgs./100 ml. Samples from treatment works and service reservoirs Free from Coliform 2,971 100% 1974-75 Samples from consumers' taps Free from Coliform 3,498
4,088 99.57%
99.24% 3,324 99.88%

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