London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Lewisham 1968
[Report of the Medical Officer of Health for Lewisham Borough]
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83
Table 72
Average results of the chemical examination of the water supplied to the Borough of Lewisham during 1968
Milligrammes per litre (unless otherwise stated)
Description of
the Sample
Number of Samples
Day of the month
Ammoniacal
Nitrogen
Albuminoid
Nitrogen
Nitrate
Nitrogen
Oxygen abs. from
KMnO4 4 hrs. at
27° C.
Hardness (total)
CaCO,
Hardness (noncarbonate)
CaCO s
Magnesium
as Mg
Sodium
as Na
Potassium
as K
Chloride as CI
Phosphate as PO4
Silicate as SiO4
Sulphate as SO
Natural Fluoride as F
Surface-active material
as Manoxol OT
Turbidity units
Colour (Burgess units)
pH value
Electrical Conductivity
(micromhos)
All Thames-derived
363
0.020
0.083
3.9
1.20
280
76
4
23.2
5.3
32
20
10
62
0.30
0.02
0.1
14
7.9
570
Deptford
4
0.006
0.028
6.3
0.15
386
145
—
—
—
43
—
—
—
0.30
—
0.0
1
7.2
760
Wilmington
4
0.010
0.026
6.5
0.21
296
65
—
—
—
26
—
—
—
0.15
—
0.0
1
7.3
550
Darenth
4
0.009
0.025
4.6
0.12
272
46
—
—
—
18
—
—
—
0.15
—
0.1
0
7.3
500
Bexlcy
4
0.007
0.019
5.3
0.15
329
80
—
—
—
21
—
—
—
0.15
—
0.0
1
7.2
580