Interesting how this stuff changes from state to state. Anyway without the big picture of how your house is designed and how big of a problem water is in your area this is difficult to answer. How high is the water table as an example? Living in the Midwest I have two large deep sump crocks in an 8ft basement. The pits are several feet deep as an example. Both have main pumps with backups. One directs water outside into a drainage system that essentially empty’s into a creek not far away. If we get a lot of rain this one gets a lot of water flowing into it. The other is for drainage from the ac and humidifier on the furnace. Very little water drains and pumps out of this one. Basically an overflow pit. From what I can see with those two small drains water isn’t a huge issue otherwise you would have bigger pits with large pumps in them. How deep is your basement btw? As far as one being plugged that may have been to prevent sewer gas from leaking into your basement and making it smell. As others have said it may help to get an assessment by a local plumber that knows your area. The money spent would help with piece of mind at least. Do they seem to fill up with more rain? Wish I could be more helpful. To be honest you’re ahead of the curve as most don’t even think about this stuff until after they have a problem. Usually a flood lol.