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Thread: Musty odor in all drains

  1. #1

    Default Musty odor in all drains

    In followup to an answer on the post: Musty bad odor posted by Sylvia on July 25, 2002 at 00:50:53:

    POST:
    My home is 33 years old and recently we had our master bath remodeled and a new shower added. Shortly after this we noticed a musty odor in the bathroom and cannot find a source. Now the same odor is in the kitchen sink area. We had our septic tank cleaned but the service person said the tank really seemed to be working well and didn't really need to be empied. Can you tell me where this odor may be coming from and how to fix it?
    YOUR REPLY:
    Can you see water when you look down the shower drain? If not, there may not be a trap. Terry

    MY QUESTION:
    I am having the same problem. I poured water down the drain for the tub since it was installed a few months ago yet NEVER used. I will soon find out if this was the issue as I can check when I get home this evening. My questions are:
    1. how long will it take to get rid of the oder once there is a trap?
    2. I don't understand why all the drains would get this odor as they do have water in the trap. Shouldn't it only come out of the untrapped drain? Im just confused and hoping that this is the problem.

    Angie

  2. #2
    In the Trades Gary Swart's Avatar
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    I can think of no way sewer odor would get past properly filled traps. Is it possible there is a leak in the drainline under the house? If there is a leak, gray water would pool and smell musty. That is not the same smell as sewer gas. I would not describe sewer gas as, "musty". I've experienced dry traps letting odor in, but the smell was gone almost immediately after charging the trap with water. Check the crawl space.

  3. #3

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    Gary
    Where would the grey water pool? In the crawl space?
    Im sorry, im still confused.

  4. #4
    In the Trades Gary Swart's Avatar
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    I assume (dangerous to do) that your drain is under the floor and over a dirt crawlspace which is the soil under the house. If there is a leak in the drain, the water that leaks out would soak into the crawlspace. A leak like this would most likely be a joint that was either poorly made or cracked.

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