Honestly, there's no way we can give good advice with such limited info. I live in a fairly rural area too, and what I'd do in your shoes is try to talk to the
nearest wildlife biologist. Around here (U.S.) we have Game & Fish to consult with, as well as some volunteer groups* that monitor the health of streams &
bodies of water (* like the "Stream Team"- which a friend of mine is on- she has a degree in biology). You alluded to several "spillages" in your area, but of
what? So without knowing how long they take to break down & the effects they caused, I'd hate to see you sacrifice any local species that might not survive.
Nor do I know what those species consume, so until you know they'd have food to have a chance to survive, I'd wait & see if you can't find some local input.
I do applaud your desire to return the area to its original natural state though...hopefully you can find some kindred spirits familiar with your area. It might
not be a "quick fix" but surely it's worth a try.
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