Lough Neagh Has Gone Green

From agricultural waste and pesticides
seeping from the land into the water.

And also from local government no longer having
a dedicated department to look after all the waters,
all the loughs and rivers, in the modern N. Ireland. 

This lough was formed by the giant Fin McCool
supposedly scooping out the the earth and throwing it
at a rival Scots giant, and missing but creating
the Isle Of Man between Ireland and Scotland.
I wonder what angry green giant, what driven reformer,
can restore the waters to health and fitness for fish,
and for human swimming in? And when can they start?