Question

Research how drinking water is tested for the presence of enteric gram-negative rods. What organisms are considered indicators of fecal contamination? What levels of organisms present are considered acceptable?

Answer 1

Identification of test for enteric gram negative rods done by various standardised micro method like API20 NE kit, BBL crystal enteric fermenting kit and also by taking sample of small amount of drinking water and passing it through purification system.samples can be taken from filter system for further investigation. Presence of bacteria shigellas salmonella, ecoli are shows indication for fetal contamination.

E coli normally lives in intestine and gut.

Maximum contaminant level for colliform bacteria in drinking water is zero per 100 ml of water.