Officials say the loss of the tax, which amounts to roughly $11 million annually in General Fund revenue, is critical to maintaining the city's operations, including public safety.
The tax will sunset in June unless a ballot measure goes before voters and is passed by a simple majority.
In 2003, the tax was set at 8 percent for five years.
Voters in 2007 approved it again as the economy turned sour and property taxes and other revenue began to dry up in the city.
Officials have called it "catastrophic" if the tax is not renewed, saying severe cuts would be needed to avoid bankruptcy.
The tax in some parts of the state is as much as 12 percent.
Officials at the workshop will discuss various rate levels and related scenarios.
The utility-users tax accounts for at least 20 percent of General Fund revenue annually.
Officials say if the tax is not renewed, the city's reserves will be depleted.
The City Council will need to meet at a future date to approve putting the tax on the ballot.
It could go before voters in March.
More information: 909-820-2525.