[SluggoF16]

While it's not Oklahoma, but Arizona, this is one of the reasons my mom moved to another apartment complex. With her renewed lease the new property management team added community water usage as part of the rent. That comes from the entire complex. With a couple swimming pools and some grass as well as all of the shrubbery and trees, it was tacking on $25-60 monthly, with the highest in the Phoenix summers. And like the OP, she was paying for other people's high usage. Her new place has a separate water meter for each unit (it wasn't a deal breaker that it had one, just a nice-to-have.)

[Threestep2]

Is this where boredom takes senior citizens? You signed a contract. That you did not ask for full disclosure of billable items is a case of hindsight. Either your rental agent or the water works can give you the breakdown. You will likely find flat fees for hook up, incoming/outgoing and minimum usage not to mention a plethora of taxes. Mustang charges ambulance services on the water bill

[WoundedSpirit]

I used to live in a 3 bedroom apartment in a 4-plex. As a single parent, I rarely turned on the heat because it was too expensive. One of the downstairs tenants lived in a 1 bedroom, but had the heat cranked up day and night to keep her dog warm. Because the heating costs were shared and pro-rated by square footage, I ended up paying for much more than I actually used. THAT was unfair.

However, the OP signed an agreement to pay a flat rate, so she is not paying for someone else's long showers. As stated several times above, she is not due a refund for what she doesn't use. If you go to a restaurant and don't finish all the food you ordered you would not expect a refund on what you didn't eat.