What are the working conditions for a plumber?

That would depend on the kind of "Plumbing" a person is performing.=Is the "plumber" taking fittings off a set of plans for an estimate or is the plumber working in a clean room or is the plumber doing very high end work or digging a ditch for a sewer and water main or is the plumbing doing drainage in a hazardous waste treatment plant?=