It has been twenty five years since I worked in municipal wastewater treatment. But “septic” usually means excessively anaerobic. There are microbes which prefer aerobic environments and those that prefer anaerobic environments. I only worked briefly with a smaller town that had lagoons. It seems occasionally they would have to aerate their lagoons to rebalance them.
Because these are public utilities you may want to ask your water authority if any of the public systems have a lagoon. Go talk to them at length. The shift supervisors will know as much as the environmental engineer about hands-on issues.
I can’t remember if your park is near a college, Jefferson. If they have an environmental engineering or enviro tech dept. they may be helpful. If all else fails, seek help from a wastewater engineering co.
Maybe I should have finished that environmental engineering program I was in while trying to work backward rotating shifts at the treatment plant.