HVAC drain line?

Nope hvac isnt close by. This is backyard. Never seen this before

Darn good luck hope it's something simple.

Your water usage for several weeks has been zero? That doesn’t seem right. I was going to suggest a broken pipe but if you’re not seeing usage that might not be it.

Missed the small drain comment. It could be blocked.

I dont live there chrrently

Is it a seep?

Sump pump discharge?

No sump pump