Authorities report at least 20 construction site toilets have gone up in flames since November.
There's little in the way of evidence left behind, except for a big, smelly mess that has to be cleaned up.
Contractors have taken to camouflaging their johns to make sure construction workers have a place to go.
CLICK HERE to follow Action News on Twitter
CLICK HERE to get Action News on your website
CLICK HERE to find Action News on Facebook