I had a long post, but deleted it because it was rambling. To summarize more succinctly:
I agree with Andy's estimate of $1000-$1500 being a reasonable annual baseline to assume. This year we have spent almost $1300 so far because we had to replace our chlorine generator, but the past two years were $224 and $365 respectively. We have a 30,000 gallon salt pool with mini pebble finish, so we don't have to worry about liners and will likely never have to touch the surface before we sell. Variable speed pump will help a lot with electricity cost, but we have solar and haven't had a bill in two years, so I'm not sure how much the pool really adds. Water bill is so much lower in our current home even with the pool than it was in our previous home (different water district), that I'm not sure how it compares to average elsewhere. Our average water bill, including pool, was $79/mo last year (giant house, 5 people, tons of laundry). Keeping a cover on the pool will reduce evaporation and lower your water bill.
Our kids love the pool, but we won't ever own a house with a pool again. We even chose to put it in, largely my fault, two years before discovering the concept of FIRE. I'll be kicking myself for it for years, but not much I can do about it at this point except make better financial decisions in the future, and make sure we use it as much as possible since the cost is already sunk.