What types of things are unsafe to dispose of in the sewer system?

Explosive liquids or solids, fire hazard liquids or solids, grease,  oils, whole blood, wood, glass, plastics, dyes, radioactive wastes,  antifreeze, oxygen demanding products and biohazard substances including  pesticides should not be disposed of in the sanitary sewer system.

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1. What do I do if I want to plant flowers, shrubs or trees within 15 feet of the edge of the pavement on a City street?
2. Who do I call if my sewer is backing up?
3. What should I do if I accidentally damage a sanitary sewer lateral?
4. What types of things are unsafe to dispose of in the sewer system?
5. If I plan on doing any type of digging on my property, do I need to call someone to locate the water and sewer lines?
6. Can I do excavation work within 15 feet of the edge of the pavement of a City street?