The actual cost incurred by the city in removing or otherwise remedying a public nuisance shall be charged to the owner of the lot or parcel of land, and it shall be the duty of the tax collector to mail a statement of the charges to the owner or other person in possession of the premises with instructions that the charges are due and payable within 30 davs from the receipt thereof. (Ord. of 7/13/71. Sec. 1(e), revised)