Legality - If a contractor finds a issue do you have legally bring it up to current specs?

Specifically, I have apparently no trap under my jacuzzi in a house I just bought. After siliconing with peelable silicon (for experiment), I came down to a final overflow in the bathroom. When I stuck duck tape over it, over a period of a half hour it bulged and let loose.
So therefore excluding the obvious trap issue to septic of the jacuzzi, there is a positive pressure trying to get out. I will mention that there is a trap under bathroom sink which I made sure had water in it prior to final test. So therefore the gas must have moved the water up just enough to escape in.
My guess (being a newbie home owner, never dealt with plumbing before) is that the pipe going to the roof is blocked so no air is getting to septic tank.
My question is, if I get someone in to fix specifically the blocked pipe and place a trap at the jacuzzi, does he have to finish all jobs. Ie, I dont see a led from behind sink pipes to the air outside. Does he have to legally do all the work or can I just get what must be done now.
The kitchen has its own air valve thingy. Washer has its own trap.
Btw, having someone in to remove the chimney in early october at latest, at that time I want to bring the plumber in. In the meantime I actually have the opening of the 2nd sink overflow directed into extra hose and out the window.
Obviously cant do this for ever but only need a few weeks.
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pauly wrote:

Sink over flow? They're illegal in this part of wood. Sure there is no trap under the tub for sure? Physically not there? Checked blocked vent stack by physical inspection? You can't just guess. Good luck,
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Legally, he is just another guy. He is obligated to do his own work in compliance with codes, buth= he will not much care about other problems and has no authority to enforce anything. Most people would suggest getting a problem resoved, but there is no obligation.

We've probably all did one thing or another on a temporary basis. Sometimes it makes a lot of sense,assume it is not life threatening.
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Interesting story in Cary, NC. Everyone in Cary, a town of about 100k people, had to boil water because Ecoli was found during routine checking of house samples. After 24 hours they narrowed it down to about half the town. After another 24 hours it was just one block. After another 24 hours it was just the one house. They believe non permitted plumbing which violated code caused the probkem though I haven't seen the final answer published in the newspaper yet. Every restaurant and hotel and meat market had to be closed for the weekend. It was no fun. Don't screw up the water supply please.
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I agree with Edwin. The plumber has to fix whatever he's called in to fix so that it complies with code. But if he finds something else wrong, he should and will likely tell you abou it, but he has no authority to force you to fix it.
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Saw that on WRAL.
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Al Bundy wrote:

probably a hose filling a swimming pool with no backflow preventer.
while the pool or whatever was filling the water service failed and the contaminated pool water got sucked back into the fresh water supply system.
thats why homes and businesses are being upgraded to check valves, people can get really sick..........
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I am on septic not town water though, only issue for me is giving the gas the option of going through to the roof. And of course a trap on jacuzzi.
I can see it all though, its on the main floor and theres drop ceiling in the basement below, so theres no issue with hidden piping.
Though my well water is clean, I do have to set that water softener kinda high, so for drinking I just use those 5 gallon water cooler tanks.
But im sure the cost of fixing the other issues would be half the bill of running return air all around the house to the sinks, jacuzzi and out to the washer.
Fixing the rest is something to worry about later prior to selling.
Al Bundy wrote:

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