grey water disinfection

Asked May 23, 2014, 9:44 PM EDT

We have collected grey water from the shower but have not used it for several weeks. Is it safe or should it be disinfected somehow? if so, how?

Alameda County California

1 Response

In general, it is recommended to use grey water within 24 hours of collection. New Mexico State University has a guide to Safe Use of Household Greywater ( that talks about methods for disinfection. Whether to disinfect the water or not depends on the use for the grey water.