Traditionally the indicator pathogens used to determine drinking water suitability were Total
coliforms and E. coli. More recent legislation has introduced Clostridia perfringens as an
indicator organism for Cryptosporidium parvum.
The study investigated the incidence of C. perfringens in the South East region in drinking
waters, ground waters and surface waters for abstraction. It was found that a number of
drinking waters and a large number of ground waters were contaminated with C. perfringens
and/or coliforms. Selected locations were analysed for Cryptosporidium spp. but none were