MadSci Network: Earth Sciences
Query:

Subject: How is drinking water still contaminated after purification?

Date: Tue Nov 22 22:41:39 2005
Posted by Terrence
Grade level: 7-9 School: North Kenwood Oakland Charter School
City: Chicago State/Province: Illinois Country: USA
Area of science: Earth Sciences
ID: 1132724499.Es
Message:

I'm asking this because i don't understand how drinking water can still contain 
things such as coliform bacteria and nitrate even after the purification 
process and why this is so.


Re: How is drinking water still contaminated after purification?

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