Attention:

Certain features of Sigma-Aldrich.com will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Media for Water Control

Water is universal used as solvent and is essential to life. People will even fight over it (water rights) as clean water supply is very important to survive. Water can be a source of pathogens and without microbiological control the supply system would spread and transmit diverse diseases. However, it would be expensive and time consuming to check the water supply for all possible pathogens and so indicator organism are used to assay for fecal or other contaminations. Coliforms and especially E. coli and Klebsiella pneumoniae are usually used for testing for fecal contamination. But it also depends on the source of water to decide a different indicator organism. So for example to check surface water supply may also Clostridium perfringens or other organisms are taken.