Wastewater

If you are experiencing a sewer backup, it’s most likely due to a blockage in the sanitary sewer service line between the house and the City’s sewer main.

Sewage backup usually first arises within the sanitary sewer system. If it happens, discharge may appear around the cleanout and/or main drain in your basement. Various materials frequently flushed or poured down the drain can harm the pipes that connect to city sewers as well as the sewer system. Every property owner connected to the sewer system can be a potential contributor to sewer problems, and a potential victim of those same problems.

In order to prevent pipe and sewer blockages and to avoid costly clean-up bills, the only items that should be flushed down your toilet are human waste and toilet paper.

To control the degree or amount of backup:

• Stop using your plumbing fixtures until you have the sewer line cleaned out.
• We recommend that you call a local plumber / drain cleaner or rent a machine yourself to clean out your sewer line at your own expense.
• You may also choose to contact Environmental Utilities to dispatch City field operators to clean out your sewer, however please note that fees may apply.

What is the most common cause of sewer blockages and what can I do to prevent them?

Most sewer blockages happen when materials that DO NOT disintegrate are flushed into the sewer system (by way of sink, tub/shower or toilet etc.). In addition these materials often coat the inside of the sewer lines over time, causing blockages that sewage cannot pass through.

“Flushable” wipes combined with Fats, Oils and Grease (FOG) and at times roots in sewer pipes and mains cause blockages and damage to private plumbing and City infrastructure. 

These costly problems can be avoided if we all become more mindful of what we are flushing down the sewer and a good start would be to stop the flushing of wipes.

“Flushable” Wipes may swirl down the toilet with ease; however they don't disintegrate and are creating serious problems as they try to work their way through the sewage system.

Some wipes may make it through the lift stations, eventually landing at the Wastewater Treatment Plant. However, most wipes and other materials are often the cause of sewer backups in City sewers, basements of homes and businesses.

In addition to causing backups, this also damages City equipment. Wastewater Treatment Plants are not designed to accept anything other than human waste and toilet paper. Wipes and other debris flushed down the sewer system become entangled in pumps and equipment within the Lift Stations and Wastewater Treatment Plant. These damaged pumps have to be replaced or repaired, which can increase maintenance costs for the Utility in turn costing rate payers hundreds of thousands of dollars.

Unfortunately, although packaging may say wipes are “flushable” - in reality they should not be flushed at all.

Most “flushable” wipes are designed with fibers that take a long time to break down in water. For sewer systems to operate efficiently, the break down process needs to begin immediately. Labeled as a cleaner alternative to toilet paper, the wipes have been estimated to cost Canadian tax payers millions of dollars each year by clogging sewers.

At this time there is no standardized testing for these wipes to make sure they will break down in the sewer system and will not become tangled in lift station pumps or cause blockages in the sewers. With there being no current standard, wipes can claim to be “flushable” when in fact they should not be flushed at all.

What can I do to prevent these problems?

These costly problems can be avoided if we all become more mindful of what we are flushing down the sewer and a good start would be to stop the flushing of wipes.

FOG can be comprised of animal fats, vegetable fats, oils and grease used to cook and prepare food. When any type of FOG is washed down the drain, it acts like glue inside the sewer pipes and mains.

Over time, the buildup of FOG, combined with other debris like food and wipes can block the entire pipe, subsequently causing sewer backup in your home, neighbouring homes or businesses. The damage caused by FOG can be quite serious with the cleanup being costly to both residents and the City.

What can I do to prevent these problems?

• Avoid pouring FOG down your drain, rather choose to dispose of FOG in the garbage.
• Wipe pans and dishes using paper towel and pour FOG (i.e. turkey fat, bacon grease etc.) into a disposable can or jar until cool.
• Dispose of cooled FOG and saturated paper towels in your household garbage.
• Review the City's Source Control Program page for more information regarding the City's effort to reduce FOG in the sewer system.

Tree roots can enter at joints, breaks or leaks in the sewer service or main line and cause blockages. If you suspect tree roots are causing sewer backup problems, contact a local plumber / drain cleaner to cut out the tree roots. Alternatively you can call us to cut out the tree roots, but please note that fees may apply.

If root infiltration is identified, a plan to eliminate or control the root growth should be implemented. Note: The City is responsible for root infiltration on public property piping occurring from public property trees only. If the investigation indicates root infiltration on private property, the homeowner or tenant is responsible.

If your sanitary sewer service line from the house to the sanitary sewer main in the street is plugged or showing signs of backup, you have the option to contact a local plumber / drain cleaning service or Environmental Utilities.

Effective since April 1, 2020, Environmental Utilities charges a fee to clear sewer blockages on private property. City field operators will clear the blockage during business hours Monday to Sunday between 8 a.m. and 4 p.m. For fee information, contact Environmental Utilities at 403-529-8176 during business hours.

If the problem is in the evening / overnight (from 4 p.m. to 8 a.m.), you may choose to call a local plumber / drain cleaning service, or wait until business hours for Environmental Utilities field operators to attend. Note that, as above, fees may apply for City field operators to attend.

The service performed by Environmental Utilities is contingent on there being proper access to the sewer cleanout and plumbing installed in your home. If the field operators are unable to access the internal sewer cleanout, it will be recommended that you contact a local plumber / drain cleaner. If an external sewer cleanout is located at the property line, field operators will clean the City owned portion of the sewer service at no cost to the homeowner.

Sanitary sewer main flushing

CCTV inspection

If you are planning to dig or excavate the ground in any way, it is your responsibility to submit a locate request before you dig.

Line locates

The City provides a wastewater disposal station to customers who obtain a permit. The Wastewater Disposal Station is located at 1257 Brier Park Way NW.

To obtain a permit for use or for more information, contact us at 403-529-8176. Please be prepared to provide a copy of your current valid business license, company billing information and current fleet information.

We are currently flushing the sewer in: Zone W

Please Note: In addition to the routine schedule, there may be additional flushing completed in some areas of the City requiring more frequent attention. Unless the flushing activities are expected to last more than one day, that specific zone will not be noted above for these locations.

Sewer Flushing Zone Map

The flushing program is an integral component to the sanitary sewer collection system as it helps clean and remove residual debris and build-up from within the mains. Flusher/Vacuum combo trucks are used to flush water through the sanitary sewer main at a high velocity to remove debris and build-up from the pipe walls.

Materials and substances such as FOG (fats, oils and grease) and wipes (even those labeled as "flushable") combined with root infiltration, rocks and dirt are common causes for the build-up within a sanitary sewer main. A routine flushing program minimizes the chances of the build-up in the mains from becoming a blockage, potentially causing sewer backup or overflow which pose significant health and environmental concerns.

The goal of any sanitary sewer flushing program is to minimize service calls and sewer backup, caused by main blockages. However, the program cannot be successful without the participation of our customers. Be mindful of what you are flushing into the sanitary sewer main and only flush what the sanitary sewer is intended to collect.

Part of the City’s routine maintenance program is the removal of tree roots in affected areas of the sanitary sewer mains. Tree roots, if left undisturbed in the sanitary sewer mains and services, will completely block the sewer causing sewer backup. Tree roots thrive in the warm, moist sanitary sewer mains that are full of nutrients which attract the tree roots. As tree roots expand, they can cause breaks and large cracks in the sanitary sewer lines which significantly decreases the integrity of the pipe.

The most common way to clear roots from a service line is through the use of root cutters and augers. The Sewer Utility is only responsible for city owned infrastructure, providing a courtesy service where applicable. However, root removal via herbicide application is the best option within the sanitary sewer mains being that they are so much larger than a service so a cutter or auger may take too much time.

If a section of a sanitary sewer main is found to be affected by tree roots, licensed operators may administer herbicide to clear the root infiltration. 

Wastewater treatment, also known as water reclamation, is a multi-stage process that cleans and restores wastewater. It removes organic matter, solids, nutrients, disease-causing organisms, and pollutants from the wastewater. After treatment, the cleaned water is released into a body of water.

In Medicine Hat, the Wastewater Treatment Plant (WWTP) handles sewage from homes, businesses, and industries in the area. The plant is located east of the city, near the South Saskatchewan River. Certified operators run the plant year-round, ensuring that the treated water meets strict industry, provincial, and federal standards.

The plant takes daily 24-hour composite samples from both the inlet (incoming wastewater) and outlet (treated water) sides. If the wastewater composition varies from the norm (for instance, due to hydrocarbons), the treatment process is adjusted. The final treated water is tested daily before being discharged into the river.

The Wastewater Treatment Plant can handle 36,565 cubic meters per day, with a peak capacity of 74,000 cubic meters per day. Currently, the average daily flow is around 26,000 cubic meters, with an average daily peak of 48,000 cubic meters.

1961

Existing five lagoons (now referred to as storage ponds) constructed to provide treatment for the city’s wastewater.

1967

Upgrades to the lagoons by adding aeration to lagoons 1 to 4. Final effluent from the lagoons at this time was discharged to the South Saskatchewan River from the North end of number 5 lagoon.

1981

A primary treatment plant was constructed upstream of the lagoons to include the administration building, laboratory, Headworks building for screenings and grit handling, primary clarification, biosolids press and an effluent pumphouse.

• At this time the lagoons became the secondary treatment for the wastewater.

1989

A secondary treatment phase added to include, trickling filters, solids contact process Phosphorous removal and Chlorine disinfection.

2010

Two Ultraviolet reactors added, to replace Chlorine disinfection, with room for a third reactor when required as Medicine Hat grows in population.

• Lagoons now serve the purpose of storage ponds before discharging the effluent to the South Saskatchewan River.
• One lagoon remains empty to use as overflow during times of extreme high flow into the WWTP.

2015

Laboratory upgrades completed to include new counters, plumbing alterations, and additional sinks.

2019

An 800kw backup generator capable of powering the entire WWTP in the event of a loss of power was installed.

2023

The third ultraviolet reactor channel was installed and put online.

Plans for future upgrades include new bar screens and grit handling in the Headworks building.