London's Pulse: Medical Officer of Health reports 1848-1972

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City of London 1967

[Report of the Medical Officer of Health for London, City of ]

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METROPOLITAN WATER BOARD — Water Examination Department BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1967

OF WATER SUPPLIED TO THE CITY OF LONDON

Source of SupplyBEFORE TREATMENTAFTER TREATMENT
Number of samplesAgar plate count per ml.Coliform countEscherichia coli countNumber of samplesAgar plate count per ml.Coliform countE. coli count
20-24 hours at 37°C.3 days at 22*C.Per cent. samples negative in 100 ml.Count per 100 ml.Per cent, samples negative in 100 ml.Count per 100 ml.20-24 hours at 37 °C.3 days at 22°C.Per cent, samples negative in 100 ml.Per cent. samples negative in 100 ml.
*Thames-derived, South of River1,8878.899.5299.95
Stoke Newington2546.599.6199.61

*Hampton, Surbiton and
Walton.

METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE CITY OF LONDON

Milligrammes per litre (unless otherwise stated)

Description of the SampleNumber of Sample's Day of the monthAmmoniacal NitrogenAlbuminoid NitrogenNitrate NitrogenOxygen abs. from KMn04 4 hrs at 27 °C.B.O.D. 5 days at 20°c.Hardness (total) CaC03Hardness (non-carbonate CaC03)Magnesium as MgSodium as NAPotassium as KChloride aa CIPhosphate as P04Silicate as Si02Sulphate as S04Natural Fluoride as FSurface-active material as Manoxol OTTurbidity unitsColour (Burgess units)PH valueElectrical 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)
*Thames-derived South of River1560.0210.0884.21.1227269522.65.1301.99640.300.010.1127.9580
Stoke-Newington520.0170.0635.20.5631277528.94.8351.410640.300.010.057.9660
*Hampton, Surbiton & Walton