The Impact of Winter Weather on Water Systems

With winter weather upon us, water systems face increased challenges. The combination of freezing temperatures, increased water demand, and potential infrastructure vulnerabilities can significantly impact the quality and reliability of drinking water. Understanding these challenges and how to mitigate them is crucial for ensuring safe and consistent water supply during the colder months.

Freezing Temperatures and Infrastructure

One of the primary concerns during winter is the risk of pipes freezing and bursting. When water inside pipes freezes, it expands, which can cause pipes to crack or burst. This not only leads to water loss but also poses a risk of contamination if the integrity of the water system is compromised. To prevent this, water utilities often implement measures such as:

• Insulating Pipes and Infrastructure: Ensure that pipes are properly insulated and that heating systems are in place to maintain a stable temperature in critical areas.
• Regular Maintenance: Conduct regular inspections and maintenance of water systems, including checking for leaks and ensuring that all equipment is in good working order.
• Heating Systems: Installing heating systems in critical areas to maintain a stable temperature.
• Communication with Customers: Encourage homeowners to be proactive about protecting their pipes from freezing in colder months.

Increased Water Demand

Winter weather can lead to increased water demand for various reasons, including the need for heating systems that use water, such as boilers and radiators. Additionally, people tend to use more water for hot showers and baths during colder months. This increased demand can strain the water supply system, making it essential for utilities to manage resources efficiently.

Contamination Risks

Snow and ice can carry pollutants, like salt for de-icing roads, that may enter the water supply through runoff. When snow melts, it can pick up contaminants from roads, agricultural fields, and other surfaces, which then flow into water sources. To address this, water treatment facilities must be equipped to handle higher levels of pollutants and ensure that the water is safe for consumption.

Mitigation Strategies

To ensure the reliability and safety of drinking water systems during winter, several strategies can be employed. Organizations should establish a comprehensive cold weather safety plan. This plan should outline precautions to take before, during, and after the onset of freezing temperatures. Key elements include: 

• Winterize water systems and ensure that exposed plumbing is properly drained. 
• Inspect building heating systems to keep areas with plumbing above 40°F. 
• Clear access to fire hydrants, sprinkler system rooms, and life safety equipment.
• Monitor and manage snow accumulation on roofs and around facilities to prevent damage and ensure safety.
• Review emergency evacuation procedures to ensure that snow, ice and cold weather conditions are adequately addressed.

Winter weather presents unique challenges for water systems, but with proactive preparation and effective management, these challenges can be mitigated. By understanding the risks and implementing appropriate strategies, we can ensure that our drinking water remains safe and reliable throughout the winter season.

Winterizing for Water Utilities

A few years back, we featured a Winterizing Checklist for Water Utilities from the Indiana Section of the AWWA on this blog. As the weather turns colder once again, it's probably a good idea to review their updated checklist for ideas on how to prepare for freezing temperatures, snow, ice and sleet at your utility and around town. For even more readiness tips, take a look at this hot-off-the-press article on how to make water infrastructure winter-ready. 

Preparing for winter weather can be as simple as making sure workers have warm work clothes, but it also means that every precaution should be taken to keep excess ice off your water tower, which can be not so simple at times. And being prepared means taking a look at all aspects of your operation: hydrants, wells/pumping equipment, storage tanks, backflow, emergency preparedness, trucks/backhoes/equipment, worker needs and emergency stock items. 

Wastewater treatment plants have unique winterizing needs. Bacteria critical to the treatment process can slow down, resulting in elevated BOD and COD levels in the effluent. So, keeping bacteria warm and cozy might mean adding additional chemicals or cold weather formulations of hardy cold-resistant bacteria. And did we mention snow? Check out this presentation on how one Maine wastewater treatment plant prepares for winter. They should know! 

Finally, we all know about the neighbors who went away on vacation in the wintertime, only to return to a house with burst water pipes. You can help your community members avoid this and other winter-related mishaps by sharing this video or fact sheet. Stay warm and safe this winter! 

Winterizing for Consumers and Small Water Systems

Winterizing for Water Systems

Consumer Information: Winterizing Plumbing and Thawing Frozen Pipes

• RCAP’s ebulletin on winterizing for the utility and the customer
• the Red Cross’s information page on winterizing pipes, and safely thawing pipes that have frozen,
• this video by a real estate agent showing how to properly drain outside spigots for the winter,
• and this video by a building contractor in Boulder, Colorado, which includes tips for turning off water to the house in the event of a burst pipe, ways of regulating temperatures so pipes don’t freeze in the first place, and advice on safely thawing pipes when they do freeze.