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Module 8 — Protecting Your Well From Contamination
Farm Water Hydrants Installed in a Well or
Well Pit
Hydrants are designed to prevent freezing by draining water back down the well when
they are shut off. This means the contents of the stand pipe and hose will syphon back
into the well. If the hose is directly connected to the water in a tank, this water will
also be syphoned down the well (see Figure 5, Farm Water Hydrant). The contents of
stock tanks, sprayers, etc. are examples of possible contaminants.
Prevention:
Always maintain an air gap between the end of a hose and the water surface, or
install a backflow prevention device.
Always disconnect hoses from the hydrants when not in use.
Prevention:
Never locate a hydrant in a well casing or well pit.
Poor Sewage Systems
Shallow groundwater can be contaminated by poorly designed, installed or operating
sewage systems (see Figure 6, Poor Sewage Systems). Cesspools constructed over the
years have been specifically identified as a greater risk.
Prevention:
The construction of cesspools is no longer permitted.
Prevention:
In Alberta, only contractors who are certified by the Alberta Onsite
Wastewater Management Association, and who hold a valid, annual Private
Sewage Disposal System (PSDS) Ticket from the Province of Alberta, are
eligible to obtain permits and install private sewage treatment systems. See
Module 3 "Design and Construction of Water Wells" for minimum distance
requirements, and Module 11 "Contacts for More Information," Alberta Onsite
Wastewater Management Association, for requirements.
Figure 5 Farm Water Hydrant
Figure 6 Poor Sewage Systems