Slime & staining

Bacteria and fungi, naturally present in air and water, can attach to damp surfaces and multiply to form a visible black slime or stain in various colours (black, red, pink). These growths are known as biofilms or ‘microbial slime’ and are most commonly seen in bathrooms and kitchens. Some biofilms can grow into certain materials and become a permanent feature. Although these biofilms can appear very unpleasant they are generally harmless and do not pose a risk to health.

For more information, including details of how to prevent biofilm growth and how to remove them, please read our factsheet on slime and staining (PDF 168 KB opens in a new window).

We also have an easy-to-read guide which explains how you can keep your tap water in tip-top condition (PDF 2,765 KB opens in a new window) 

If you are at all concerned about the quality of your water please call us on 0345 672 3723. Dial 18001 first if you have hearing or speech difficulties.

Important Notice

Impact of Heavy Rainfall

Heavy rainfall across the North West may be causing flooding in some parts of the region.

Our teams are out across the North West helping customers who have experienced sewer flooding in their homes.

If you’re experiencing flooding from a road or footpath and there is no evidence of sewage (toilet paper etc.) please report this to your local council, who are responsible for highways drainage flooding.

Please take a look at our flooding page for further advice on what to do if you’re affected by flooding.

We’re seeing heavy rainfall across the North West again which is causing flooding, our teams are out across the region helping customers who are experiencing sewer flooding. Flooding in the road or footpath should be reported to your local council, who are responsible for highways drainage flooding.

Flooding Advice

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