Wexford County Council said “recent spells of heavy rain may have been a contributing factor” to the poor water quality.
Gardaí are appealing for anyone who may have information to come forward.
The illegal drugs were found with the assistance of detector dog Timba.
The man in his 50s was arrested this morning in Co Wexford.
Who’s going to progress to this year’s Leinster decider?
The protest took place at a hotel in Gorey in 2015.
There were 33 male passengers whose bodies were never recovered and Gerry Kealy is working through the families to rule them out.
One driver was also speeding at the time.