Black gunge on WC & tap outlets?

[fingertight]

Hi chaps, i wonder if anyone can tell me if they have ever come across a black snotty gunge on outlets such as cold taps, WCs etc, and more importantly, what causes it?

I have been called out to around 4 jobs over the last 6 months with the owners complaining of this "blackish snot" on the tap outlet etc. They have always been cold mains taps on sinks & WHB's, and B.V on WCS & combi tanks, its also not confined to one geographic area. Ive come across it in Leamington Spa, Solihull, and today in Worcs. To the touch it feels like snot, but with a black/ish colour, generally seems only to affect one house and not a row. Im baffled Any info would be appreciated!

 

[JohnD]

is it black mildew? Bleach cleaners remove it?

 

[hi-spec plumbing heating]

as last reply mildew, damp

 

[fingertight]

Would mildew have a snotty texture, its like blended frog spawn.

 

[hi-spec plumbing heating]

maybe frog spawn they like the damp get a french man to try it.

shounds like a mixture of water, damp, dirt, p**s

 

[fingertight]

Thanks Hi spec, I think that is the most plausible cause, if it was anything organic in the supply the Water auth would have jumped on it. Nice one for your input chaps

 

[hi-spec plumbing heating]

common under the cisterns where the bathrooms cold and damp.