I'm having a hard time finding any regulation which directly addresses this, but when I look at the criteria for such job postings, none of them are requiring applicants to have a hazmat endorsement.
11 hours between mandatory 10 hour breaks.
Not unless you're hauling something such as contaminated soil, which requires a hazmat endorsement.
There is a license requirement to drive a pumper truck in Florida. The requirement is a class B CDL license.
If you don't have a hazmat endorsement, up to 1,000 lbs.
If you're hauling hazmat, missing hazmat signs are a federal offense. If you're NOT hauling hazmat, you don't even need the placard frames.
To do a septic tank cleaning you must open the tank, have means to get the waste out, and have a place to put it. This can usually be done with a septic truck which has a tube which will suction most of the waste from the tank.
Someone who knows how to drive a truck and is legally licensed to drive a truck has to train you, so that you can drive a truck (but you do also have to get a license).
Depends on your country. If you have an air brake endorsement, then you're not in the US, as there is no such thing here. Other countries require it. Your licensing requirements for operating that vehicle will also depend on the Gross Vehicle Weight Rating.
It can, depends on how deep it is and how big or heavy the truck is. It is usually better to avoid doing it.
In the $50,000 price range
A 1/4 ton pickup. Vehicles carrying any quantity of hazmat which requires placards to be displayed require the driver to have a CDL and hazmat endorsement.
Depends on what exactly their job is. Not all CDL jobs are equal.