What is NOT okay to put in the sewer system?

It is illegal to pour any hazardous chemicals into the sewer system. Proper disposal of such chemicals should be dealt with according to federal, state, and local laws. While not illegal, it is not recommended to put any of the following down the drain: grease, oils, and fats; pre-moistened wipes; bandages or dressings; cotton balls or swabs; catheters; wrappers; feminine hygiene products; facial tissues; test strips; topical solutions; medications or supplements; cleaners or disinfectants; cigarette butts; dental floss; diapers; hair; paper towels; hypodermic needles; or dust, dirt or lint. 

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1. Where can I find a list of the City of Framingham's Licensed Drainlayers? How do I become a Licensed Drainlayer?
2. What do I do if I see sewage in my house, yard, or in the street?
3. Who is responsible for my sewer service?
4. How do I know if I have a sewer blockage?
5. How can I protect myself from sewer blockages?
6. What is okay to flush down my toilet?
7. What is NOT okay to put in the sewer system?
8. Can I connect my sump pump to the sewer?
9. What do I do if a City manhole cover is making noise, visibly damaged, or missing?
10. Am I allowed to open a manhole cover myself?