The average custodial salary at Alvin Isd was $24,830 , which is 6 percent lower than the average salary for this job in Texas, and 25 percent lower than the national average for this job . Custodial salaries at Alvin Isd typically range from $18,984 to $28,604 (25th to 75th percentile). The highest reported custodial salary was $88,487. There are 196 employees at Alvin Isd with the job title custodial.