How Were the WHPAs Determined?

The Region has determined its WHPAs based on mathematical computer modelling to predict groundwater flow patterns in a specified area and identify the length of time it takes water to reach each well.

This area is also known as the "capture zone" or "capture area" of the well and is commonly considered as the Wellhead Protection Area. The Region identified capture zones based the following time frames: 50 days, 1 year, 2 years, 5 years, 10 years and 25 years. To explain what the time frame means, take, as an example, contamination from a potential spill within the 2-year capture zone. The contamination would take two (2) or less than two (2) years to reach the municipal well if the well is pumped at its maximum permitted rate.