In 2019 there were a reported 319 failures in water quality due to coliform exceedance (GOV.UK, 2021). Coliform detection within drinking water is an indicator that disease-causing organisms (pathogens) could be in the water supply.  If a cause for this is not identified, coliform exceedances can be attributed to localised contamination of sample lines or taps, potentially due to the mobilisation of biofilms.

The aim of this project is to identify how to better manage sample lines (and taps) by investigating the effect of sample line operational parameters on biofilm growth and mobilisation into the bulk water, Biofilms (microbial communities adhered by extracellular polymeric substances) form at the pipe wall, degrading water quality and affecting asset integrity.  This research aims to improve biological compliance, and critically, protect water safety.

Sample line biofilm formation, characteristics (microbiome, EPS, physical structure) and mobilisation will be monitored under different hydraulic regimes to characterise the biofilms and how they interact with sample line materials.