Christchurch residents could soon face a fine of up to $20,000 for posting junk mail or littering in charity donation boxes.

Under the new waste management and minimisation bylaw, the offence of depositing junk mail in any letterbox marked no circulars, could result in the fine.

Measures under the bylaw also include the non-collection of kerbside bins if the contents don't comply.

Councillor Aaron Keown told Mike Hosking he isn't fully convinced the new rules are necessary.

He doesn't see the offence as being a high priority.

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