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Why Is There A Sewer Smell In Our 5th Wheel Trailer?

by Claudia
(Florida)

Why Is There A Sewer Smell In Our 5th Wheel Trailer?

Why Is There A Sewer Smell In Our 5th Wheel Trailer?

My husband lives full time in our 5th wheel because of his job and lately we have been having sewer smells. The camper sits for a long time without moving. Are we suppose to keep the black water tank closed and dump it every so often or can we keep it open and use the toilet and flush and the waste goes out? Give me some advice as what to do.

Thanks

ANSWER: Greetings Claudia thanks for submitting your question on our Ask An RV Question Page.


Even when you are hooked up to a sewer system at an RV park you should always keep the dump valves closed on both your grey water and black water holding tanks. If you do not, the sewer smell from the RV Park’s sewer system can enter your RV.

You will also accumulate a lot of bad smelling human deposits on the bottom of your black water tank as the liquid will go directly in the sewer system and the solids will remain and cause a bad smell that will also enter the trailer.

Once the holding tanks get 1/2 to 3/4 full you need to dump them and flush the tanks. You then close the dump valves and pour about two or three gallons of water into both holding tanks, so the future waste will be diluted by the water at the bottom of the tank.
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Once you have added the water to the tanks you should also pour some Holding Tank Deodorizer and Treatment in each tank. The amount of deodorizer you use depends on the size of your holding tanks. The instructions on the deodorizer will tell you how much to use.

Before leaving the campground always dump and flush your tanks regardless of how much waste they have and then follow the instructions I outlined above.

I hope this helps.

Do you have any suggestions or comments on this topic? You can add them to this page by clicking on the "Click Here To Post Comments" link located near the bottom of this page.

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Comments for Why Is There A Sewer Smell In Our 5th Wheel Trailer?

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Sewer Smell Solved
by: Anonymous

Thanks to your site the smell is gome. Hubby checked the batteries and they were bubbling! Just purchased this used 5th wheel 2 months ago. A lot to learn. We knew we had new tanks but still assumed it was a sewer smell. Then we worried it was our septic tank in our yard! Never would have thought batteries! Thanks so much!

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Huge help
by: Terry

My carbon monoxide detector went off at 3 am. This is when I realized it was not my sewer and something else. I read the post about the strong smell in the battery compartment and felt the battery and it was sizzling. Once I opened the other side I could see the batter off gassing right into my trailer. Huge props to the site for helping me figure out the smell.

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Air Admittance Valve (AAV) .... (edited)
by: Mike (edited)

Yep folks, Every time I flushed the toilet and washed my hands the island in the living room of my 5er collected a less than delightful smell that leaked into the room much to my wife painful chagrin!

The fix was easy. Under each sink in some RV's there is a plumbing stack with an AAV valve on top. It unscrews by hand. Replace it with any of the air admittance valves from RV supply, Home Depot, or Lowes. My under island valve was bad from the factory and constantly leaked foul air into the rig. No smell now, happy wife!

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galley grey water smell
by: Anonymous

We occasionally have a terrible odor when we run water in the kitchen sink. I would smell the water as it came out of the tap, and under the sink where the flapper type vent is and no smell. Finally figured it out, the grey water roof vent is within 12 inches of the kitchen roof vent. So with the vent open and a breeze blowing just the WRONG way it comes right into the kitchen. not sure how I am going to fix it. Designed poorly it is just too close to the vent.

I am thinking of installing an extension on vent pipe to raise the funky fumes up and away from the roof vent.

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Sewer gas from black water holding tank
by: Anonymous

What causes sewer gas to bubble up from toilet when flushing

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Sewer smell 5th wheel
by: Anonymous

my camping neighbors were having this problem. Wasn't sewer was battery sulfur. Thank you!

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Sewer smell that is not sewer
by: Anonymous

This site help me so much, after reading the comments about the batteries.. I told my husband and one of batteries was so hot and swollen it was about to explode the other was hot but not bulging. thank you for the information...

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Found it!!
by: Doug

Thank you so much for the posts dealing with grey tank sewer gas. Kitchen sink plumbing is issue and the crapper is off the hook! Who would have thought dish and shower water would build such an offensive odor. I did check my batteries too but they were trouble free luckily. I can't find the one way valve that is sticking yet but the smell is overpowering there and will remove drawers tomorrow to expose more plumbing. I added a double load of black tank treatment to the grey tank to temp. alleviate problem. I love these forums.

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Sewer smell
by: Dana

Oh my goodness.... I read the above post as I had tried everything to get our RV to stop smelling... guess what..... it was the batteries!! I told my husband what I had read.... we went out the RV (which we just had turned on for a trip later next week); we took off the battery compartment and wham the sewer smell hit us and the battery was hot!! Thank you for the great info!!

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Leave Holding Tank Valves Closed
by: John

Many of the problems with blockages and odors when connected to a campground's sewage can be attributed to leaving the holding tank valves open. Typically, there is not enough water dispensed when you flush to move the solids through the RV hose to the septic.

Even when camping long term to full hookups, its advisable to leave your black tank valve closed and empty occasionally followed by a good amount of water.

If you have odors when moving, it may be time to replace your roof vent with a newer, more efficient one that pulls the odors out.

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sewer smell in motor home
by: Deby

we have a sewer smell in our motor home as well but it comes only when we run water down the kitchen, bathroom or shower drain. It actually seems to be coming from the ceiling. What can be causing this?

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sewer smell that is not sewer
by: Anonymous

When we couldn't find the sewer smell around our 5th wheel nor could the RV park manager, I turned to the internet not even knowing where to start. Well I found the only answer that we had not tried and that was to check the batteries, and sure enough it was so hot my husband could barely touch it and the smell of sewer and rotten eggs was extremely strong ... we took out both batteries and will replace them but was told the hottest one could have exploded at anytime. I am so thankful for finding this information.

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ditto? ?
by: brown family

Having horrible sewage smell. We are the only 5th wheel here at trailer park. plumbing fixtures faucets replaced / swapped and hooked up for permant plumbing (ex: like home or apartment) in other words our sewage is hooked to city.

The manager has sent plumber each time he has snaked from trailer outside. Once he tried.to.snake from putside into trailer which broke gasket that houses the lines at where meets at ground. every time problem comes back and each time has backed up toilet, then shower and last time he came and snaked the pipe from roof.. still sewage smell and was told to never flush toilet paper again?? Please help.

Our lot is the.first and closest to street. Is it possiblly a problem related to city sewage? Plumber has just recently stated that he determined it was our 5th wheels sewage problem all along. So now what ? how to remedy this?

We keep paying and its never been fixed. Becoming more severe mess odor and outrageous plumbing costs for.a person on state disability income. some how have to make payments on all past plumbing visits. Please offer suggestions or.do it yourself remedies. If there is.one

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Vent Stack may be plugged
by: hansfx

Hi
We noticed a smell in our trailer lately once we had used the toilet, and I noticed a slight smell in my closet - that just happened to house the two Vent poles (stacks) up to the roof. My husband actually ended up going up and taking off he protective cover, and found out that the black water stack was plugged. Once he cleared the blockage (with a very long skinny black pvc pipe) the smell disappeared! Hope this info helps!

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Sewer Smell in your RV
by: Lew Mann

There can be several possible causes of sewer smell in your coach. All the above advice is valid. But, there is more.

Believe it or not, your gray tank can stink more than your black tank. The smell can enter the coach via the P-traps under your sinks and shower. Before you travel, make sure to run enough water down the drain to fill the p-traps. If left unattended the water evaporates.

If you look under your kitchen and bathroom sinks you will see the black pipes that carry the water off. At some point the pipe branches skyward and is capped by a check valve. Find the cap for your toilet too. Sometimes these valves stick open emitting sewer odor to the coach. The caps are cheap to replace. You can find them at most RV dealers or even home improvement stores.

Working at an RV dealer has its advantages. I learn about products that are not well advertised. One such product is "RV Digest-It" from Unique Manufacturing. Recently, my black tank became clogged with solids. My Service Manager added a quart of RV Digest-It to my 45 gallon black tank and filled the tank with water. We let it sit for 24 hours. During that time all the solids were digested by the enzymes and my tank was clean!

Now I use two capfulls of RV Digest-It in my black tank after I have dumped and added water. I also use it in my gray tank.

You should be able to find this or similar product at RV dealers near you.

Lew Mann
Webmaster & "Doer of Many Things"
J.D. Sanders RV Center
Alachua, Florida
www.sandersrvs.com

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Sewer Smell Might Not Be Sewer
by: McElvain

Several months ago we returned from a day trip to find a strong sewer smell in and around our camper. We left the area the next day after thouroughly cleaning the tank and adding all the stuff that's supposed to help. The odor went on for a few weeks until we finally discovered it was not the sewer but the battery. It had overheated and it was sulfur we were smelling! We were told they can potentially explode when that happens. We would have sworn it was a sewer problem. So if your smell is persistent, check the batteries.

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