The average custodial salary at Mexia Isd was $19,315 , which is 27 percent lower than the average salary for this job in Texas, and 41 percent lower than the national average for this job . Custodial salaries at Mexia Isd typically range from $17,155 to $21,485 (25th to 75th percentile). The highest reported custodial salary was $28,040. There are 23 employees at Mexia Isd with the job title custodial.