Earlier quoted context omitted.
Yes. Who do you think laid the infrastructure for people to get water and sewers in the first place?
That depends on the city. If it was originally a company town, probably the company. If it's a new build, probably the property developer. But either way, something that already exists is not subsidising the plumber's salary. The plumber is paid by the customer.
That's not considering your customers, who are likely also subsidized by the government in some fashion - if their jobs do not involve federal or state government contracts or supplying or servicing companies holding such contracts, they're almost certainly taking advantage of advantageous tax rebates or deductions.