Found hole with water under house
Wow! What a surprise. I don't think it's related to any county storm drainage system. Wouldn't hurt to contact them though. My best guess is someone acquired some spiral reinforcing somewhere and used it to construct a dry sump for some purpose. It was then forgotten until the cover collapsed and you noticed something amiss. The water probably means you have a shallow water table.

If my assumptions are correct, you just need to fill it in. If there is no nearby foundation structure, you just need some manual labor to haul in fill material. If it is near a foundation, at least some of the fill may need to be compacted. Depending on access, this can be difficult. You could probably hire any general contractor willing to take on the job.