If the job requires outside access to plumbing fixtures, plumbers may work outside, as long as the work done is on the homeowner's property. For example, a clog in the sewer lines that connect to the city's sewer system may require the plumber to access the line through a riser pipe on the property away from the structure of the home. Some other jobs that involve outdoor plumbing work include: Water line repair and replacement Sewer line repair and replacement Septic tank service, repair, or installation