[Report of the Medical Officer of Health for Hammersmith. page -

Hammersmith 1972

[Report of the Medical Officer of Health for Hammersmith.

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METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT

AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO LONDON BOROUGH OF

HAMMERSMITH DURING 1972.

Milligrammes per litre (unless otherwise stated)

Description of the Sample	Number of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Oxygen abs. from KMn04 4 hrs at 27° C	BOD 5 days at 20°C	Hardness (total) CaC03	Hardness non carbonate CaC03	Magnesium as Mg	Sodium as Na	Potassium as K	Chloride as CI	Phosphate as P04	Silicate as SiO2	Sulphate as SO4	Natural Fluoride as F	Surface-active material as Man-oxol OT		Turbidity units	Colour (Burgess units)	pH value	Elec trical 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

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METROPOLITAN WATER BOARD — Water Examination Department.

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1972. WATER SUPPLIED TO THE LONDON BOROUGH OF HAMMERSMITH.

Source of supply	BEFORETREATMENT							AFTER TREATMENT
		Agar plate count per ml.		Coliform count		Escherichia coli count			Agar plate count per ml.		Coliform count	E. coli count
	Number of samples	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.	Number of samples	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.
River Thames-derived	8087	42.3		41.94	10.2	56.76	4.0	3891	10.0		99.85	99.97

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B 15