I am also in Ohio and also found that the local water company changed their policy to charging a base fee for each lot or other unit in the park year round, whether the unit is occupied or not and whether the lot has a unit on it or is vacant.
I am pretty sure that if all of you dig far enough you will find this is because of the EPA. I have a park that is on it's own water service and my EPA representative for drinking water told me on the last on site visit that I needed to get a company to come out and sub meter and bill each tenant for water. He said that the EPA wanted each water system to have its own "war chest" of funds to use for improvements. He said that the funds that the EPA has for grants for municipal systems and loan funds for private systems are limited and likely to become more limited.
When I spoke to a representative of the municipal system that serves another property he said they were basically told by the EPA that they had to change their billing practices so they were not dependent upon EPA funds for EPA mandates. So basically the same thing.
all I know is that after I had already sent out lease renewals for one of my parks the municipality sent me a notice that they would no longer sub bill my tenants and I had to pay a minimum for each lot year round
After consulting with my attorney it was obvious that I was going to take a loss on water bills for 9 months until the lease was up for renewal
and now the sewer is doing the same thing as far as billing for a monthly minimum instead of a minimum based on usage. This park has suddenly become much more expensive to operate.