Turbidity is common where the source of water is surface water from lakes, streams or ponds, especially in spring when runoff from winter snowmelt begins.
Turbidity is caused by the presence of finely divided solid particles and makes water appear cloudy and murky. Turbidity can cause staining of plumbing fixtures and laundry, can have an abrasive effect on plumbing systems, and can interfere with disinfection methods.
Turbidity, depending on its cause, can be very difficult to remove.
Silt, sand, and coarser particles can be removed by polypropylene filters.
Fine colloidal particles can be removed by carbon or ceramic filters.
Reverse osmosis may be required to remove the finest colloids.