'severely polluted' can be used in written English.
For example, “The river was severely polluted with toxic chemicals.”.
The site of a former silver factory that has been severely polluted with chlorinated solvents was treated by excavating the polluted soil and installing a pump and treat system.
The experimental results show that our strategy can curb the propagations of the polluted files effectively and efficiently even in the severely polluted structured P2P networks.
And the air in many Chinese cities remained severely polluted.
As lakes disappear, rivers are either being depleted or severely polluted.
Rivers and ponds in Guiyu Town in Guangdong Province were severely polluted in 2005.
This area is severely polluted and contributes significantly to the HRB phytoplankton communities.
In the Gaza Strip, the available freshwater sources are severely polluted and overused.
Superfund, which parallels the federal program by the same name, deals with the most severely polluted sites.
However, it is severely polluted and requires immediate effort to improve its quality and increase its usable quantity.
The groundwater of two-thirds of cities is severely polluted, according to official data, while two-fifths of rivers are tainted.
The state has a separate program to clean up brownfields, less severely polluted sites, and there is wide sentiment in both parties to expand it.
