The City of Dawson Creek’s existing water treatment plant was built in 1958 with major upgrades in 1991 and 2004. In 2007 a UV disinfection system was also installed.
Dawson Creek’s class‐IV Water Treatment Plant is 1 of 18 within the province of British Columbia. The treatment consists of one main clarifier which combines Flocculation and Coagulation in a single chamber. An Adsorption Clarifier is used for 90% of flow that goes through the Water Treatment Plant. This clarifier uses the principle of adsorption of solids onto a solid surface. This process does not depend on the formation of a large floc and on average, uses less than 10‐50% of raw water chemical as required by other Water Treatment Plants. The clarifier is a very simple piece of the process in terms of operations that incorporates mixing, flocculation and the ability of solids removal in one process. This clarified water then passes through a balancing tank where the water is distributed through 6 banks of multi media filters by gravity. The filtered water is than passed through a Granular activated Carbon process which assists with reduction of taste, odour, and total organics in the water. The theory behind Granular Activated Carbon involves adsorption—a physical/chemical activity lead‐ing to accumulation of water impurities at the solid‐liquid interface. Then the clean filtered water is disinfected with Ultra violet light (UV) and sodium hypo chlorite is added as a secondary disinfection at a concentration of about 1mg/l leaving the Water Treatment Plant.