I have a large enough parcel to subdivide. What are the sewer service requirements?

Current policy allows a 4-inch sewer service to serve a single family home or a duplex. A 6-inch sewer service will serve 3 single family homes, or a duplex and 1 single family home. The service requirements for developments in excess of 3 lots and high-density developments may require design by a licensed engineer and are subject to review by the Wastewater System Division. 

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1. My septic tank works fine, so why do I have to connect to the sewer system?
2. What happens if I do not connect?
3. Can a contractor "mark-up" the cost of the sewer connection permit?
4. Can I do the sewer work myself?
5. Can I drain my swimming pool into the sewer?
6. Can I have a RV dump on my parcel?
7. Can I pipe floodwater from my basement or foundation drains into the sewer?
8. Can I pipe the roof runoff into the sewer?
9. Can I put a floor drain in my shop / garage and connect it to the sewer?
10. Can my next-door neighbor and I share a common trench with our sewer pipes?
11. Does my septic tank have to be removed?
12. How should I go about hiring a side sewer contractor?
13. How long is a sewer permit good for?
14. How much does it cost for a contractor to connect my property to sewer?
15. I have a large enough parcel to subdivide. What are the sewer service requirements?
16. What does a sewer connection permit cost?
17. What happens if I do not have the money to connect?
18. When do I have to complete my connection to the sewer system?
19. Where is my sewer connection (stub)?
20. Why do I need a permit to connect to the sewer?
21. Why does the monthly sewer service fee keep going up?
22. Will Spokane County complete my sewer connection for me?