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SANITARY CIRCUMSTANCES OF THE AREA.
Water.
The Borough is supplied with water from three sources.
By far the greater part is supplied by the Barnet District
Gas and Water Company, and two small areas by the Colne
Valley Water Company and the Metropolitan Water Board
respectively.
The water of the Barnet Company is derived from deep
wells in the chalk. The wells are at New Barnet, East Barnet,
Potters Bar, Tyttenhanger, Roestock, Northaw, Hatfield
and North Mimms.
The water is chlorinated at each of the pumping stations
except Northaw and East Barnet where there is a heavy
overlay of clay on top of the chalk and where the liability
to pollution is extremely remote. The bulk of the water is
examined bacteriologically every day and detailed examinations
are made at each pumping station once a week.
Of 529 samples taken in 1936, 96.4 per cent. contained
no B. Coli in 100 c.c.
Each month a copy of a report of a bacteriological examination
carried out by an independent bacteriologist is
sent by the Company to the Medical Officer of Health.
Once every three months a sample is taken by this Department
and submitted to bacteriological examination, and
the following is a typical report:—
No. of Bacteria per c.c.
On Agar in 3 days at 200 C. 1
1 day at 370 C. o
2 days at 370 C. 1
Bacillus Coli Absent in 100 c.c.
Bacillus Welchii Absent in 100 c.c.
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