How long after treating a well can you drink the water?
Last updated Reviewed by Sean Mihelich, founder of Save My Well
Give the disinfectant its full contact time with no water use: overnight, about 12 hours, for the chlorine dioxide in our kit, as its label directs, and 12 to 24 hours for a bleach treatment per extension guidance. Then flush the treated water out through every outlet and from an outside spigot. Drink from another source until a bacteria retest one to two weeks later comes back clean.
Treating a well with a disinfectant is also called shock chlorination.
The flush usually takes a few hours of running an outside hose onto ground that drains away from your septic and garden. Follow all directions on the product label for the flush, and drink from another source until the bacteria retest comes back clean.
Showering is lower stakes than drinking, but wait for the flush to finish either way; treatment-strength disinfectant is rough on skin and rougher on septic systems if you send it down the drain.
Sources
Ohio State University Extension, Shock Chlorination of Wells (AEX-318), 2019
Penn State Extension, Shock Chlorination of Wells and Springs, 2025
Minnesota Department of Health, Well Disinfection, 2024
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