ursusguy said:
You can harass them up to the point the first egg is laid. Move on it quickly.
You do NOT want them to get established. They can end up attracting cattle egrets.
Look up Carrolton egret on YouTube. I developed their response plan for 2012, and used since then with success. Reality is neither the state or feds are going to do much unless it is stupidly over the top, see Carrolton 2001...and why they were so cautious in 2011.
I grew up in Carrollton, and was still in high school back in 2001. Lived one street south of what became the George Bush Turnpike. That was a mess (literally). our neighborhood was overrun with egrets, coyotes, roadrunners, and all sorts of wildlife when they started clearing that space. The high school I attended also had an "active shooter" situation around that time.
One Christmas, a few years ago, I was back in town visiting my mom. On Christmas day, there was an egret in her front yard, acting real funny and holding his wing in a way that made me think it was damaged. I called the non-emergency number, cause animal control wasn't answering their phones on Christmas day (surprise). About 5 minutes after I mentioned the word "egret" to em, an animal control officer in plain clothes came hauling down my moms street.
That was when I realized that, in Carrollton anyway, off duty animal control will respond faster to a report of an egret, than the police department will to a report of a shooter.