Police say gunfire was exchanged after two officers pulled over a suspected impaired driver near Abbottsfield Mall at 9:30 p.m.
"It's one of the most dangerous things police officers do is stop cars," said police Chief Rod Knecht during an early morning press conference on Tuesday.
"When we stop a car, you don't know who is in the vehicle, what they have been doing or what they are planning on doing. So this is just another example of a simple traffic stop that turns into something."
Knecht said the officer, an eight-year member with EPS, was shot in the lower body and has non-life threatening injuries. The other officer involved has been with EPS for 10 years.
The Alberta Serious Incident Response Team (ASIRT) has taken over the investigation.