All of a sudden, are you having problems with water in your bathroom toilet or sink smelling like rotten eggs, or a sewer? If a drain, sink, or toilet in a bathroom is not used for long periods of time, or if there is a leak in what’s called a P-trap, the P-trap may go dry and allow sewer gas to rise up into the home. The P-trap is the section underneath your sink that is shaped like a “U.” If it’s not a leak, you can refill a P trap by pouring water in the shower drain, or running water down the sink and bathtub drain for about 10 minutes. Note: If the odor doesn’t go away soon, there may be something else causing the smell, and you may want to call a licensed plumber.
Try to establish a routine twice-monthly maintenance schedule for yourself to prevent the smell from returning.