Average Results of Chemical Examination Milligrames per litre (unless otherwise stated)
Description of the Sample Number of Samples Ammoniacal Nitrogen Albuminoid Nitrogen Nitrate Nitrogen Oxygen abs. from KMn04 4 hrs at 27 C B.O.D. 5 days at 20 C Thames-derived South of River 156 0.029 0.090 4.4 1.27 Honor Oak 3 0.055 0.033 0.1 0.39 Description of the Sample Hardness (total) CaCO 3 Hardness (noncarbonate) CaCO 3 Magnesium as Mg Sodium Potassium as Na Sod ium Potassium as K Chloride as C1 Thames-drived South of River 279 77 5 24.2 5.0 32 Honor Oak 316 53 11 14 Description of the Sample Phos phate as PO4 Silicate as SiO 2 Sulphate as SO 4 Natural Fluoride as F Surfaceactive Material as Manoxol OT Turbid ity units Thames-drived South of River 1.8 9 62 0.20 0.01 0.1 Honor Oak 17 72 4.0 Description Colour (Burgess units) pH value Electrical Conductivity (micromhos) Thames-drived South of River 15 7.8 560 Honor Oak 9 7.2 550 !()
match: ALTO ComposedBlock
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Water from wells
There are a number of wells in use, the majority of which, however, supply water
used only for industrial purposes. The water from three wells is used for drinking
purposes, or for the preparation of food. Reports of the analyses of water from these
wells are received regularly, and have been satisfactory for the year under review.
The well in Clapham, Rectory Grove, formerly in the old Metropolitan Borough of
Wandsworth, is used if and when required to augment the Metropolitan Water Board
supply. This well is 400 feet deep supplying 15,000 gallons per hour, and was
originally installed in 1927.