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bacteriological samples were submitted to independent analysis and all of
the latter were reported free in 100 m.l. quantities from undesirable
organisms. Six samples of water were taken by the Department and submitted
for analysis with satisfactory results, coliform organisms being absent in
100 millilitres in each case.
The Colne Valley Water Company exercises constant supervision, and
members of the staff are on duty day and night throughout the year examining
samples. All the water supplied by this Company is chlorinated. The
water supply is satisfactory both from the Chemical and Bacteriological
aspects.
The water supply to the whole district is considered adequate, and all
houses are supplied by these companies mains, with the exception of one
house which was found during the year to be using well water which is
pumped up to a store tank in the roof space. A sample of water from the
tap was submitted to the Laboratory and was found to be bacteriologicaily
satisfactory.
DRAINAGE AND SEWERAGE.
The town is drained and sewered on the separate system, excepting the
older portions of the district where it is a combined system. The sewage is
conveyed to a Sewage Disposal works of 56 acres, where it is screened, grit
removed in detritus tanks, thence to primary settlement tanks and thereafter
distributed over 3,80 ft. diameter bacteria filters, followed by hunus
removal in rectangular tanks before discharge to the Dollis Brook. Pumping
is necessary for three sewers which have their outlets at a low point on the
works. Part of the Totteridge area drains to the Finchley Borough sewers;
in the outlying areas some properties are on cesspool drainage or domestic
sewage disposal plants, and a few only have pail closets.
SANITARY CONDITIONS AND WATER SUPPLY OF SCHOOLS.
There are in the district fourteen schools administered by the South
Herts Divisional Education Executive Committee, via;- Queen Elisabeth's Boys
and Girls Grammar Schools; Ravenscroft Secondary Modern School; Foulds
School (Junior Mixed and Infants Departments); Christ Church School for