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
Enfield 1972
[Report of the Medical Officer of Health for Enfield]
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ENVIRONMENTAL HEALTH
(28) Water supply - Lee Valley Water Company: representative sample
| Chemical results expressed in milligrammes per litre | |||
|---|---|---|---|
| Appearance: | Clear and bright | Ammoniacal Nitrogen | 0.04 |
| Colour (Burgess) | Less than 5 | Albuminoid Nitrogen | 0.02 |
| Odour/Taste | Nil/nil | Nitrate Nitrogen | 5.7 |
| Turbidity | 0 | Nitrite Nitrogen | 0.00 |
| Conductivity | 610 | Oxygen Absorbed | 0.38 |
| Total solids | 440 | Fluoride less than | 0.2 |
| pH | 7.1 | Silica | 8 |
| Free CO2 | 34 | Iron less than | 0.02 |
| Alkalinity (CaCo3) | 210 | Other metals | absent |
| Carbonate Hardness | 210 | Phosphate | 0.09 |
| Non-Carbonate Hardness | 100 | Residual Chlorine | Nil |
| Total Hardness | 310 | Temperature °C | 11 |
Bacteriological examination
| No. of Colonies developing on Agar | 1 day at 37°C | 2 days at 37°C | 3 days at 20°C |
|---|---|---|---|
| 0 per ml. | 2 per ml. | 0 per ml. | |
| Present in | Absent from | Probable No. | |
| Presumptive Coli-Aerogenes | — ml. | 100 ml. | 0 per 100 ml. |
| E. Coli | — ml. | 100 ml. | 0 per 100 ml. |
| Cl.Welchi | — ml. | — ml. |