But it will be a slow rollout, officials say.
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The legislation will be implemented starting Thursday, July 1.
Businesses have until April 1, 2022, to comply.
After that they will be fined.
Environmental advocates say Philadelphia uses close to 1 billion single-use plastic bags every year.
The city will use the next nine months as a warning period.
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Business owners are encouraged to start phasing out their single-use plastic bag supply now and post signs to notify customers.