I work for a company that produces mineral cleaners and wants to mitigate the effects of the phosphates in their product. They have the idea that eutrophication due to phosphorus is not a problem in all waterways. In essence, they would like to find a map of which geographic regions are most impacted by phosphorus pollution to educate consumers about which products are environmentally safe to use in their region.
So far, I've found a great deal of maps listing costal eutrophication zones, but none of inland ponds, lakes or waterways.
First is there any scientific basis to this idea--is phosphorus a non-issue in particular regions, therefore permitting the use of phosphate detergents in the area?
Second, do further maps exist that document inland eutrophication zones?
Thanks for your time,