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Reoccupying a Building After an Extended Closure

Guidelines for safe drinking water

Lengthy quarantines can cause water to stagnate in your pipes and degrade the water quality.  One of the first things you will want to do when you reoccupy your building is to flush out the water that has been sitting in the building's water system with fresh water from the City’s distribution system.  

Steps you should follow in the order outlined below to flush your system when you reoccupy your building.

  1. If you have a building engineer or facility manager be sure to consult with them to assist in flushing the internal plumbing.
  2. Turn on the cold water inside the building (break room sinks, drinking fountains, utility closets, restrooms, etc.) on each floor.
    • Start from the furthest point away from where water enters the building (e.g., for a building with five floors, start on the fifth floor and work your way to the first floor.) Remember to run only cold water.
    • The cold water has been successfully flushed when you feel the water temperature go from slightly warm to cold.
  3. Flush hot water storage tanks (boiler and/or hot water tanks per manufacturer’s flushing instructions) to displace stagnant/discolored water with fresh water.
  4. Repeat step 1 using hot water.
    • The hot water has been successfully flushed when you feel the water temperature turn from warm to hot.
  5. Flush and perform preventative maintenance on point-of-use devices or systems, such as cooling towers, systems providing additional water treatment, etc., per the manufacturer’s recommendations as applicable.

Once all domestic water service lines, internal plumbing, and point-of-use devices/systems are flushed/properly maintained, it will be safe to drink the water.

Other good ideas: 

• Notify your building occupants of the status of the water systems and the flushing program.
• Develop a water management program.

• Consult the CDC for comprehensive guidelines for specific industries such as hotels or restaurants.

More resources for you:



Contact Us

Greeley Water and Sewer

1001 11th Avenue, 2nd Floor
Greeley, CO 80631

Monday - Friday, 8am - 5pm

970-350-9811 tel
970-350-9805 fax

Water Conservation

970-336-4168 for Water Budget

Water Quality

Taste, odor, or appearance



Water 7am-3pm970-350-9320
Sewer 7am-3pm970-350-9322
After hours/ weekends970-616-6260

Other Numbers

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