Construction
Poorly constructed wells can lead to the contamination of a ground water source that supplies many users.
If you are hiring people to work on your water system, make sure they are trained and qualified. Most provinces have a registration process or require certification for contractors who construct water systems, and many only allow registered or certified well installers to drill or dig wells.
A professionally drilled well will have a well log that records the water level and the soil conditions. This information will help you determine the amount of water, the water quality, and the degree of source protection you can expect.
More information on the construction standards and guides in your province is available from your local Ministry of Environment or Ministry of Health.
Well Sealed
A common issue with wells is improper well seals after construction. If a well is not sealed properly with clay (surface seal) and a secure cover (well seal) is not fitted, contaminants such as animal droppings and runoff can enter into the groundwater.
In coastal areas, salt water can seep into well water, which can be costly to treat.
NB: If an aquifer has been contaminated, it may take decades before it produces drinkable water again, since there is no easy way to flush out contaminants