Maintain a Swimming Pool Project Cost upwards of $300 upwards of $300 cost of owning a pool up to $700 on pool maintenance swimming pool maintenance HomeAdvisor pool maintenance costs up to $700 on pool maintenance upwards of $300 get expensive upwards of $300 pool in the best condition involves some high costs pools and hot tubs can be quite costly spend $84 to $278 your pool maintenance costs common pool maintenance tasks HomeAdvisor upwards of $300 upwards of $300 upwards of $300 pool in the best condition involves some high costs for an average of $243 a month swimming pool maintenance up to $700 on pool maintenance