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Communities count on us. We count on each other. Our purpose statement speaks to the essential nature of the services our people provide. In 2018, public opinion research found that Edmontonians rated critical utility and health infrastructure as the most important community assets to protect from flooding — even more important than their own homes.

Several of EPCOR's critical utility assets are located next to the North Saskatchewan River, including Edmonton's two water treatment plants and a major electrical sub-station, each of which is at risk from flood events. We're implementing protection plans for these assets to protect them from 1:200-year flood events, and in some cases, from 1:500-year floods. These investments are partly offset by federal and provincial grant funding.

We have further studies underway across the full range of its operations, examining the potential impacts of extreme weather events on the ability to deliver reliable utility services. This will result in additional action plans to improve system resiliency and reliability.

​Hear from EPCOR's own Audrey Cudrak on how we're working to safeguard critical infrastructure – and the Edmonton region's drinking water – from the impacts of a major flooding event.

​Scenario planning: Understanding the risks from extreme river flooding

The worst flood experienced in Edmonton since modern records have been kept occurred in June 1915. Considered a 1:180-year event, it resulted in widespread destruction of Edmonton's river valley and the relocation of most businesses to higher ground.

Our Edmonton water treatment plants supply water to nearly one-third of Alberta's population. Both are located next to the river, with infrastructure at varying elevations and extensive below-grade facilities, including reservoirs.

We conducted scenario planning for a recurrence of a 1915 flood event. The analysis predicted that river flood water would enter the water treatment plants across overland flood plains and through underground waste stream/overflow piping systems that discharge to the river. Critical electrical infrastructure, chemical storage facilities and reservoirs would all be damaged.

The immediate impacts and aftermath would be considerable. Forecasts indicate that without improvements to protect the water treatment plants, the ability to treat water could be interrupted for three to 10 months, and a boil water advisory would need to remain in place until the entire distribution and transmission network is flushed and disinfected. Until water production is restored, customers would be supplied with water trucked-in as part of EPCOR's Emergency Water Supply Plan.

A disruption of this scale would have a substantial impact to the regional economy, and the direct costs to EPCOR would be extensive. ​

​Protecting utility infrastructure from extreme river flooding

In 2018, we initiated a multi-year capital program to improve the flood resiliency of Edmonton's water treatment plants. These efforts have been extended to critical electrical infrastructure also located in the river valley.

The Flood Protection Project will provide protection for a 1:200 year flood through investments of $36.9 million, partly supported by $11.4 million in federal and provincial grant funding. The investments will reduce the risk of catastrophic damage to the water treatment plants and electricity infrastructure during a flood, and enable the facilities to resume potable water treatment as quickly as possible following an extreme flood event.

Investments include:

Critical asset protection or relocation

through hardening of underground reservoirs and chemical storage tanks against flood-related structural damage, and the raising of key electrical infrastructure above flood water heights (completion in 2023)

Backflow prevention from waste stream outfalls

which stops the backflow of flood water through process drains, preventing indoor flooding of buildings and treatme​nt process equipment contamination (completion in 2023)

Prevention of overland flood inundation

using embankments and barriers to connect existing high ground around the treatment plants (completion in 2027)

​Framework for drinking water emergencies

​Scenario planning and business continuity planning are key tools used to manage and mitigate risk, including climate adaptation risk. In addition to extreme flooding events, EPCOR water treatment operations could be disrupted by a range of high-impact, low-probability events, including other types of natural disasters, extended river contamination and physical attack.

We worked with key stakeholders to develop a drinking water emergency exercise plan for the Edmonton and region water system. The plan focuses on how to supply customers with drinking water in the event of a disruption to the water treatment plants. The work has been documented in a Framework for Drinking Water Emergencies in the Greater Edmonton Region, an Emergency Drinking Water Supply Plan, and a five-year exercise plan. Critical to these plans is the ability to quickly access alternative water supplies and to mobilize physical distribution of water to residents in Edmonton and the surrounding regions.

What we're doing at our water treatment plants

Find out what we're doing at the Rossdale and E.L. Smith water treatment plants, timelines for this work, and how we're engaging the communities.

Rossdale water treatment plant

E.L. Smith water treatment plant