Three pilot studies were performed in different areas of South Africa, demonstrating that particulate and colloidal turbidity can be reduced to acceptable levels. By operating at a static manifold pressure of between 100 and 140 kPa and a constant flux of 30–40 l/m2.h, up to 85% removal of NOM and >90% reduction in colour was observed. No microbiological indicator organisms were detected in any of the permeate samples analyzed. During the operation of the membranes for more than 3 years, a loss of only 5% of membrane area was experienced, and a membrane life of >5 years can therefore be expected. The use of polysulphone ultrafiltration capillary membranes at a low operating pressure is able to remove natural organic matter, reduce organic colour (humic and fulvic substances) and partially disinfect the water. Ultrafiltration provides a simple and effective means for the production of potable water for small communities.