Yes, you can generally still use your cold water fixtures if your water heater is leaking, provided you shut off the cold water inlet valve feeding the water heater. However, if the leak is severe, if you shut off the main house water supply valve, or if you suspect contaminated water from a compromised tank, you should avoid using water fixtures. Verification: Test cold water taps to ensure safe pressure while keeping the water heater's inlet valve closed to prevent further flooding.
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