A company flushed/cleaned today the fire sprinkler system in the condominium but the potable water got "brown" I am not familiar with WA state, but shouldn't be a back-flow preventer on the fire sprinkler pipes? The maintenance man said that it is normal and the water will stay "brown" for few days ??? So, we will drink brown or contaminate water for few days. I know our mentors have the answer.