ADU sewer not connected...waste in the crawl space

[Jonny Morris]

Soooooo...at least it isn't Summer but...

The smell, which I have been blaming my dogs for...has actually been linked to a fairly big, unpleasant error. 

To connect our house to the apartment above our garage or "Additional Dwelling Unit (ADU) we had to have pipes excavated underground to ensure that the garage apartment could connect to sewer/water from our house. The build was finished, passed by the city, and towards the end of the project asked me "who is connecting the apartment to your house?".

I assumed, being the plumber - that he would do so, he explained that we hadn't mentioned this and he'd have to 'send some guys out'. 5 months later and it turns out the waste pipe from the apartment has been draining into our crawl space as no one connected it. They connected the running water - but not the waste?!?!?

How could this be missed? Was it my job? The plumber? The city? I understand that ultimately, the responsibility falls with me...but I also wanted to reach out and see if anyone has a perspective or strategic approach to rectifying this manner. 

1) Connect pipe (50ft) - not overly concerned with this aspect. 

2) Clean up and have restoration company undo the damage - mildly concerned and expect a few thousand dollars fee (who pays?)

3) Feel that someone from the city should have connected/inspected this aspect?

Best wishes for your thoughts...