Tucson Water has lost power at its main office at 310 W. Alameda.
That means people cannot call into the utility until service is restored, spokesman Fernando Molina said.
The power shut down at the office at 4:30 p.m., forcing the office to close early and stop making payments.
Molina said the power outage is even affecting the company's automated payment system.
Tucson Water says it does not anticipate powering up its computer or phone systems until 5 a.m.
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