Abstract: An accumulation of organic and inorganic live and dead organisms, both on and off the surface, is known as a biofilm. However, little patches on pipe surfaces are more common in water systems. It might be a complete coating. Biofilms in drinking water distribution systems and pipe networks can cause a variety of operational and water quality problems. Red or black water issues caused by bacteria that break down iron or sulphate can be attributed to biofilms, along with an increase in bacterial populations, a decrease in dissolved oxygen, taste and odour alterations, and problems with taste and smell, microbially influenced corrosion, hydraulic irregularity, and decreased material life can all be attributed to biofilms.