The average custodial salary at Sinton Isd was $21,680 , which is 18 percent lower than the average salary for this job in Texas, and 34 percent lower than the national average for this job . Custodial salaries at Sinton Isd typically range from $20,143 to $22,322 (25th to 75th percentile). The highest reported custodial salary was $28,920. There are 24 employees at Sinton Isd with the job title custodial.