Northland Regional Council area manager Peter Wiessing took little time to identify the owner of bags of rubbish dumped into the Awanui River from Kaitaia's Allen Bell Drive bridge on Monday.
The stench had hardly dissipated from his vehicle when he said the culprit, who had confessed, would be fined $750.
"It really is cheaper to take rubbish to the transfer station than to dump it in the nearest river," Mr Wiessing said, although the more offensive element on Monday was a fish bin of sheep offal that was also removed from the water.
"People think eels will eat this stuff but they won't, he said.
"All they're doing is polluting the water, possibly to the point, especially in smaller creeks, where the eels will die.