I Am Having Problems With Odors Coming From Both The Shower And Sink Drains In Two Of My Three Bathrooms. They Are At Opposite Ends Of The House, On Different Septic Tanks. The Strange Thing Is That The Odors Only Happen When It Rains. Even The Slightest Amount Of Rain Will Cause The Odors. I Feel Confident That This Is A Venting Problem Since The Vents Are Seeing/ Collecting The Rain.
Can Anyone Confirm Or Suggest Another Cause?

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Originally Posted by RICH MALONE

I Am Having Problems With Odors Coming From Both The Shower And Sink Drains In Two Of My Three Bathrooms. They Are At Opposite Ends Of The House, On Different Septic Tanks. The Stange Thing Is That The Odors Only Happen When It Rains. Even The Slightest Amount Of Rain Will Cause The Odors. I Feel Confident That This Is A Venting Problem Since The Vents Are Seeing/ Collecting The Rain.
Can Anyone Confirm Or Suggest Another Cause?

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Hi Rich,
Rain increases the humidity in the air making the odor heavier then air so the gas,(odor) does not raise but instead drops to where it can be smelled.
Most bad oders in bathroom drains come from rotting hair mixed with grease from the soap. Try this. Tonight before you go to bed pour 1/2 gallon of bleach down both drains and let it set overnight. Next morning flush it down with a few large pans of boiling water. The bleach will start to dissolve and soften the hair and make it slippery and the boiling water will melt the grease and flush the mess out into the main. Now see if that smelly drain doesn't smell sweeter? Regards, tom