Details:

Corporate Authors:
National Center for Immunization and Respiratory Diseases (U.S.). Division of Viral Diseases.
Description:
Updated Sept. 22, 2020

Summary of Changes

• Added guidance for lead and copper in building water systems with low or no use

• Added guidance for mold awareness, monitoring, and remediation during and after prolonged building shutdowns

• Updated Legionella guidance for people with weakened immune systems and the use of respiratory protection when flushing water systems

• Updated title to reflect content

The temporary shutdown or reduced operation of a building and reductions in normal water use can create hazards for returning occupants. Check for hazards before reopening after a prolonged period of building inactivity. Hazards include mold, Legionella (the cause of Legionnaires’ disease), and lead and copper contaminationpdf iconexternal icon from corroded plumbing. For mold, a “prolonged period” may be days, weeks, or months depending upon building-specific factors, season, and weather variables.1 For Legionella, a “prolonged period” may be weeks or months depending on plumbing-specific factors, disinfectant residuals, water heater temperature set points, water usage patterns, and preexisting Legionella colonization.2 For lead and copper, a “prolonged period” may be hours, days, weeks, or months depending on plumbing and water-specific factors, the amount of time the water remains stagnant inside the pipes, whether there are protective scales or coatings present inside pipes that prevent metals from leaching into water, and the materials used to build the plumbing system.3 Note that additional hazards not discussed on this page may exist for returning occupants. These can include other hazards, such as non-tuberculous mycobacteria, disinfection by-products, and sewer gases that enter buildings through dry sanitary sewer drain traps.


Content Notes:
Mold -- Legionella and Legionnaires’ disease -- Lead and Copper -- Additional Resources.
Subjects:
[+]
Commerce Copper Coronavirus Infections COVID-19 Disease Outbreaks Drinking Water Environmental Monitoring Fungi Lead Legionella Legionnaires' Disease Pandemics Risk Assessment Water Microbiology Water Supply Workplace
Series:
Coronavirus Disease 2020 (COVID-19)
Document Type:
Webpage
Genre:
Guidance
Place as Subject:
United States
Collection(s):
Stephen B. Thacker CDC Library collection
Main Document Checksum:
[+]
urn:sha256:69593faf0b4a00539c89b92316fd5b49ae481c6e5831d6321818bd0afcfb3762
Download URL:
https://stacks.cdc.gov/view/cdc/94227/cdc_94227_DS1.pdf
File Type:

Supporting Files

• building-water-system.html

  htm

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