Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Bromley]
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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE LONDON BOROUGH OF BROMLEY FOR 1972
Milligrammes per litre (unless otherwise stated)
Description of the Sample | Numbera of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMAO 4 hrs at 27° C. | B.O.D 5 days at 20° C | Hardness (total) CaCOj | Hardness / non- \ V carbonate' CaCOa | Magnesium as Mg | Sodium as Na | Potass ium as K | Chloride as CI | Phosphate as PO | Silicate as SiO2 | Sulphate as SO4 | Natural Fluoride as F | Surface-active material as Manoxol OT | CO2 | Turbidity units | Colour (Burgess units) | pH value | Electrical Conductivity (micromhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
River Thames-derived | 364 | 0.031 | 0.069 | 6.9 | 1.06 | — | 274 | 82 | 5.0 | 24.5 | 5.5 | 35 | 2.8 | 10 | 58 | 0.15 | 0.02 | 0.1 | 13 | 7.9 | 570 | |
Eynsford | 8 | 0.002 | 0.010 | 5.5 | 0.07 | 280 | 40 | 2.5 | 17 | 0.10 | 30 | 0.1 | 0 | 7.3 | 490 | |||||||
Horton Kirby | 8 | 0.003 | 0.014 | 5.6 | 0.10 | 270 | 55 | 2.6 | 20 | 0.11 | 29 | 0.1 | 1 | 7.3 | 490 | |||||||
Lulling stone | 7 | 0.005 | 0.014 | 5.1 | 0.10 | 262 | 34 | 2.3 | 16 | 0.09 | 21 | 0.1 | 1 | 7.3 | 460 | |||||||
Merton | 1 | 0.070 | 0.016 | 0.5 | 0.04 | 244 | 24 | 13.0 | 23 | 0.40 | - | 1.3 | 22 | 7.3 | 450 | |||||||
Nth. Orpington | 8 | 0.006 | 0.013 | 6..1 | 0.07 | 273 | 30 | 2.5 | 15 | 0.08 | 36 | 0.1 | £1 | 7.2 | 560 | |||||||
Orpington | 4 | 0.002 | 0.015 | 8.5 | 0.08 | 296 | 52 | 2.5 | 19 | 0.08 | 40 | 0.1 | 1 | 7.2 | 550 | |||||||
Shortiands | 12 | 0.003 | 0.011 | 6.7 | 0.12 | 290 | 72 | 4.0 | 26 | 0.10 | 31 | 0.1 | 1 | 7.1 | 550 | |||||||
Sundridge | 16 | 0.006 | 0.013 | 43 | 0.08 | 224 | 58 | 3.0 | 20 | 0.09 | 20 | 0.1 | 1 | 7.5 | 420 | |||||||
West Wickham | 4 | 0.002 | 0.011 | 6.6 | 0.11 | 267 | 35 | 2.5 | 15 | 0.09 | 35 | 0.1 | 1 | 7.2 | 1490 | |||||||