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Frank J. Horgan Filtration Plant

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The Frank J. Horgan Filtration Plant is located Southeast of Toronto on

the shores of Lake Ontario (See map). Its purpose is to provide safe drinking

water to our taps by filtering the water. The water is gathered from Lake

Ontario. This plant has a production capacity of 455 million litres per day to

supply the residents of Toronto with drinking water. Its average production of

drinking water is 355 million litres per day. It is also the newest filtration

plant in Toronto.


The Frank J. horgan Filtration Plant was built from 1974 to 1979 on

property acquired from the city of Scarborough, It opened on May 22,1980. When

it opened, it was not named Frank J. Horgan Filtration Plant but was names

Easterly Filtration Plant. This was because the plant was on the eastern side of

Toronto. The name seemed appropriate at the time. The name was changed to Frank

J. Horgan Filtration Plant at 1990 by the commissioner of works for Metro

Toronto. This plant cost about 57 million dollars to construct. About nineteen

major contractors worked on this plant and were supervised by the Engineering

firm of James F. Macharen Limited. Although it is the newest plant, it had it’s

disasters. Their intake value exploded twice between 1980 and 1995 because of

the extreme pressure and Wight of the water. these incidents cause a shutdown of

the plant until they could repair it.


The Frank J. Horgan Filtration Plant needs only one row materials to

operate, which is water. The plant is right next to lake Ontario, collecting

water to purify. The water enters the plant by means of two 114 and four 182

million litres per day pumps, sum 18 meters below sea level and 2960 meters off

the shore. Since the pressure of the water at that depth is so strong, there is

no need for any mechanical pumps. They just let pressure and suction to do the

job. The water is now treated with chemicals which are aluminium sulphate (alum),

lime and chlorine. Alum is used to stick dirt particles together, to make large

clumps of dirty called “floc”. A lot of chlorine is added to the water to kill

the bacteria. If we were to drink it, you would die from chlorine poisoning. The

Chlorine, by the end of the filtration, drops to a safe level. This is where the

alum does its work. Coagulation is basically mixing the alum with the water.

This is a achieved by high speed in-line mechanical blenders. Flocculation

occurs right afterwards.

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