This video covers proper bacterial sample collection procedures for drinking water, including where and where not to collect these types of samples. In addition, the importance of monitoring your water for bacteria is discussed. Monitoring is really the only way to ensure the water you are serving to the public is safe to drink.
For more information:
http://www.iowadnr.gov/Environmental-Protection/Water-Quality/Drinking-Water-Compliance/Training-Informational-Videos
