[cyanydeez]

No. Only obscenely large ones do so. It's not really required unless you are taking in huge amounts.

[xedrac]

My small local landfill harvests methane, and this is in a state where regulations very minimal. I'm not sure what you consider obscenely large.

[cyanydeez]

Looks like it's defined in the clean air act

https://19january2021snapshot.epa.gov/lmop/frequent-question...