[Report of the Medical Officer of Health for Finchley] page 75

Finchley 1963

[Report of the Medical Officer of Health for Finchley]

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WATER SUPPLY TO FINCHLEY(1) Chemical Samples Examined

	No. of Samples Examined	Raw Water mg/1.		No. of Samples Examined	Treated Water mg/1.
	No. of Samples Examined	Lead	Fluoride	No. of Samples Examined	Lead	Fluoride
Essendon Pumping Station	10	Absent	Less than 0.2	9	Absent	Less than 0.2
Hatfield Pumping Station	9	Absent	Less than 0.2	9	Absent	Less than 0.2
Northaw Pumping Station	3	Absent	0.7	2	Absent	0.7
North Mymms Pumping Station	10	Absent	Less than 0.2	10	Absent	Less than 0.2
Roestock Pumping Station	2	Absent	Less than 0.2	2	Absent	Less than 0.2
Tyttenhanger Pumping Station	—	—	—	3	Absent	Less than 0.2
Cecil Road (20" main)	—	—	—	8	Absent	Less than 0.2
Arkley Reservoir	—	—	—	6	Absent	Less than 0.2
Total	34			49

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(2) Bacteriological Analysis of Pumping Station Raw Waters

Pumping Stations	No. of Samples Examined	E. Coli ABS/l00 Mis.	E. Coli Present in Mis.
Pumping Stations	No. of Samples Examined	E. Coli ABS/l00 Mis.	100	50	10	1.0	0.1	0.01
Essendon	49	—	—	7	23	17	2	—
Hatfield	50	10	3	8	16	8	5	—
Northaw	24	21	1	1	1	—	—	—
North Mymms	53	—	—	1	12	27	13	—
Roestock	12	5	1	4	1	1	—	—
Tyttenhanger	1	1	—	—	—	—	—	—
Total	189	37	5	21	53	53	20	—

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(3) Bacteriological Analysis of Pumping Station Treated Waters

Pumping Stations	Number of Samples Examined	Number of Samples E.Coli— Absent/100 ml.	% Purity Treated Water Samples
Essendon	49	49	100
Hatfield	50	50	100
Northaw	24	24	100
North Mymms	365	365	100
Roestock	24	24	100
Tyttenhanger	16	16	100
Total	528	528