Issue around soil stack / moist soil?

[G_a94]

Hi,

We recently had an issue with slug marks on our kitchen wall and, while investigating where the slugs might be getting in, I took a look inside a hatch in our kitchen which allows access to our soil stack and stop tap.

While I was looking, I noticed a small amount of moist soil around the base of the soil stack. There are no other signs of leaking or pooling water, and all surrounding wood work is dry to touch. There is also a large amount of dry dust surrounding, which makes me think there can't be a severe leak from above.

Essentially, is this an issue we need to be worried about? As this is our first house (60s semi-detached), I've never encountered an issue like this before so, while a small amount off moist soil beneath the floor of the house may be nothing, I want to be sure in case there's any immediate action we can take.

Thanks,
G

 

[Ian H]

I would clean everything up best you can then watch it while you use all the bathroom services.

 

[HERTS P&D]

Put some drain dye in the toilet then flush it.

https://www.toolstation.com/drain-t...MIrcf1jLHD7wIVqujtCh29VAFwEAQYAiABEgIgG_D_BwE

Andy