What do we do on an otherwise rag board with one over?

Very loose table...friday night..stacks are deep. I got 1500 or so and most ppl bought in for 1k max

I'm playing tight but there has been a lot of bluffing and showing at the table and I've probably folded too much.

Villain is loose pre and the whole table is loose too but there are heavy hitters at the table. 3 or 4 winning regs. Villain is a rec player with a lot of money usually see him on weekends. Far from nitty

Hero raises to 25 with JJ in EP v calls in HJ.. Both blinds defend

Flop K74r

Checks to hero who bets 65 and v calls

Turn 9

I check v checks

River 2 hero checks v bets 250...just over pot

How polarized do you think his range is? If you think he is playing KQ, KJ this way (possibly even AK although you might hear from that preflop) then I think it's a fold. If it is only sets and bluffs, then I think a call is justifiable.

He also called your Cbet with both blinds still to act, which seems strong. Sets seem pretty unlikely given he would have to check back with a set. As played, I would fold.