Highest salary at Groton - Emp/Pol in year 2018 was $42,999. Number of employees at Groton - Emp/Pol in year 2018 was 3. Average annual salary was $36,692 and median salary was $34,528. Groton - Emp/Pol average salary is 22 percent lower than USA average and median salary is 21 percent lower than USA median salary.