Hydrant flushing is a routine maintenance procedure performed by water utilities to clean water mains and ensure high-quality drinking water. It primarily works by forcing a large volume of water rapidly through the pipes, which dislodges and flushes out accumulated sediments and minerals.
What is Hydrant Flushing?
Hydrant flushing, also known as water main flushing, involves opening fire hydrants sequentially throughout a water distribution system. This action creates increased water flow and velocity, scouring the inside of the pipes. It's a proactive measure to maintain the integrity and cleanliness of the public water supply infrastructure.
Why is Hydrant Flushing Necessary?
Over time, natural sediments, such as iron and manganese, can settle and accumulate in water mains. These materials are naturally occurring and harmless in small amounts but can lead to issues if left to build up.
Maintaining Water Quality
- Removes Sediment: Flushing stirs up and removes settled minerals and sediment that can accumulate at the bottom of pipes, especially in older systems or areas with lower flow rates. This prevents them from being introduced into homes and businesses.
- Improves Clarity and Taste: By removing these particles, the water's clarity improves, and potential taste or odor issues associated with stagnant water or mineral buildup are mitigated.
- Ensures Safe Drinking Water: While the water is generally safe even with some sediment, flushing helps maintain optimal water quality standards.
Protecting Infrastructure
- Identifies Issues: The process can help identify potential problems within the water distribution system, such as closed valves, leaks, or areas of low pressure.
- Prolongs System Lifespan: Regular cleaning helps prevent corrosion and scaling, contributing to the longevity of the water pipes.
The Hydrant Flushing Process: How It Works
The process is straightforward but strategically planned by water utility crews.
The Mechanics
Water utility crews systematically open fire hydrants in designated zones. This operation dramatically increases the flow rate and velocity of water within the main pipes. This surge of water acts like a powerful scouring brush, effectively stirring up and flushing out the settled minerals and sediments from the mains. These materials, including iron and other naturally occurring minerals, are then discharged out of the open hydrant. Crews monitor the water being discharged until it runs clear, indicating that the section of the main has been cleaned.
What to Expect During Flushing
While flushing is a beneficial process, it can cause temporary changes in your water.
| Aspect | Description |
|---|---|
| Water Color | You might observe water that appears discolored, often described as "tea-colored" or rusty. This is due to the disturbed minerals and sediments. While visually unappealing, the water is generally still safe to drink and use. |
| Water Pressure | You may experience a temporary drop in water pressure while flushing is ongoing in your area or an adjacent zone. |
| Laundry Stains | Important: The discolored water, though safe for consumption, may stain laundry. It's advisable to avoid washing clothes during flushing periods or until the water runs completely clear from your taps. |
For more detailed information on specific flushing schedules or what to do during flushing, check your local utility's website or public works department.
Practical Tips During Flushing
If you receive a notification that flushing will occur in your area:
- Check for Notifications: Pay attention to local utility announcements via mail, email, social media, or local news.
- Run Cold Water: If your water appears discolored, run the cold water tap for a few minutes until it clears. Start with a tap furthest from your water meter.
- Avoid Hot Water: If discolored water enters your hot water tank, it can take longer to clear. Avoid running hot water or doing laundry until the cold water runs clear.
- Collect Water Ahead: If you're concerned about temporary discoloration, you might consider drawing a small amount of water for immediate needs before flushing begins.
Common Questions About Hydrant Flushing
- Is the water safe to drink? Yes, even if discolored, the water remains safe to drink and use. The discoloration is due to harmless mineral particles.
- How long does it last? Flushing typically lasts for a few hours in a specific area, though system-wide programs can run for weeks. Individual discoloration should clear within minutes once flushing stops.
- Why does my water look worse after flushing? This indicates that the flushing process successfully dislodged sediments. Continue running cold water until it clears.
Hydrant flushing is an essential part of maintaining a healthy and efficient water distribution system, ensuring that communities receive clean and reliable drinking water.
