Pond safe treatment on fire ant mounds? Boiling water. Or urine.
Leave the mount alone (so that the queen doesn't grab her heels and run), boil enough water to completely saturate the mound, and then pour the boiling water down the mound. Boiling water will kill the queen and all other ants it hits.
The key is the queen. Don't disturb the mound and have enough water to flood it out.
Regarding urine, it also can work. Just enjoy those 64 ounce gatorade bottles, save up the urine, remember to cap it after each urination, and then when you have enough in the jug go drop it on the mount same as boiling water. I think boiling water is more effective as instant death, but I have learned that fire ants do not like to get pissed on, so I started saving the urine up and man does it make them move away. But they just move to another area. Urine will kill some ants, but not as many as boiling water.
