The average custodial salary at Post Isd was $20,766 , which is 21 percent lower than the average salary for this job in Texas, and 37 percent lower than the national average for this job . Custodial salaries at Post Isd typically range from $18,322 to $24,245 (25th to 75th percentile). The highest reported custodial salary was $25,690. There are 11 employees at Post Isd with the job title custodial.