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 1965
[Report of the Medical Officer of Health for Lewisham Borough]
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79
Table 61
Average results of the chemical and bacteriological examination of the water supply to the Borough of Lewisham for 1965
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)
CoCO3
Hardness
noncarbonate
CaCO3
Magnesium
as Mg
Chloride
as CI
Phosphate
as
PO4
Silicate
as
Si02
Sulphate
as
S04
Natural
Fluoride
as F
Surfaceactive
material
as
Manoxol
OT
Turbidity
units
Colour
(Burgess
units)
pH
value
Electrical
Conductivity
(micromhos)
Bexley
4
0.005
0.028
5.2
0.18
322
72
20
Nil
Nil
7.2
580
Darenth
4
0.005
0.024
5.0
0.16
266
34
21
0.2
Nil
7.2
480
Deptford
4
0.007
0.030
5.6
0.18
360
116
39
0.1
Nil
7.1
690
Wilmington
4
0.020
0.025
6.9
0.14
290
56
25
0.2
2
7.2
540
All ThamesDerived
363
0.049
0.091
4.3
1.20
264
68
4
41
1.9
10
64
0.25
0.10
0.1
15
7.6
560