Laws on keeping ducks

[Cali Hi]

Aloha everyone,

It's been a while since I have been here. I hope everyone is well.

I have a question about keeping ducks on ag land and I can't seem to find any information. You guys seem to know stuff, lots of stuff. So I thought I'd ask.

Is it required to keep your ducks in a pen? They seem like a free range animal to me but someone told me they had to be restricted a pen on your property. And they told me that the department of health called them a health hazard. This sounds almost impossible as they fly, so the cage would have to have a roof.

Is this just a case of an annoyed neighbor? I really like the ducks, they eat bugs and don't crow. seems like a win to me.

Thank you and have a great day!

Aloha,

Jen
California/Hawaii