Simple and effective

The plant’s operation has been acclaimed for its simplicity and a study for Health Canada found it to be highly effective on all levels.

In the fall of 1981, about 60 cases of the upper intestinal disease giardiasis had been confirmed at the village of 100 Mile House. The Giardia lamblia cysts originated in the village’s surface water source, Bridge Creek, and were distributed in the village’s water distribution system.  Chlorination was the village’s only water treatment.

The plant includes:

  • Surface water intake
  • Raw water pump station
  • Three cast-in-place concrete slow sand filters, each 43m x 6m
  • Chlorination including a contact tank
  • Treated water pump station
  • Control building

The plant’s operation has found acclaim throughout North America for its simplicity and effectiveness. A follow-up year long study for Health Canada found very effective removal of Giardia cysts, turbidity through the filters and a reduction in taste and odour after chlorination.

This plant was the focus of the American Water Works Association Research Foundation “Slow Sand Design Manual” and has served as a model for the construction of other similar plants in British Columbia.