The average plumber salary at La Joya Isd was $35,907 , which is 31 percent lower than the average salary for this job in Texas, and 60 percent lower than the national average for this job . Plumber salaries at La Joya Isd typically range from $32,423 to $36,580 (25th to 75th percentile). The highest reported plumber salary was $50,674. There are 11 employees at La Joya Isd with the job title plumber.