You should start w/ the county government (Will County, right?), since as you say this is unincorporated meaning your "local government" is actually the county, and most likely there is an intergovernmental agreement between the county and Joliet for Joliet to provide your area with services that the county does not or can not.

As to a monopoly typically water and sewere services are such. But are you willing to pay for service from elsewhere that could result in a huge special assessment? Probably not. Or for upgrades to your lines because they may be older and are leaking and the deal may be that Joliet may be responsible for their replacement without a special assessment at a later date? And you may not be able to disconnect either, if your area is not allowed to use well water (perhaps it is contaminated?) or septic systems (because your land is too small....).

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