United Utilities are in court later over the pollution of drinking water which left thousands of households in Lancashire without a supply.
Water at the Franklaw treatment plant near Garstang became contaminated with a parasite almost two years ago, making it unusable.
7 hundred thousand people were forced to use bottled water
Now United Utilities are being prosecuted the company for supplying water unfit for human consumption.
The company says its taken a full part in the investigation.