Is it okay to dump car oil down the sanitary drain system in my house?

No, oil causes the filtration system at the treatment plant to fail and the filtration system must be cleaned and replaced, causing thousands of dollars in damage.

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1. Is it okay to dump grease down my house drains?
2. Is it okay to dump car oil down the sanitary drain system in my house?
3. Is it okay to flush plastic items down the toilet?
4. What is this manhole for in my back yard?
5. What should I do if I see liquid flowing out of a sewer manhole?
6. How are sewer lines maintained?
7. How does the treatment process work?