In contrast to the laborers' salaries of $2 per day's work, the pay stub at the left shows pumping house engineer D.C. Cregier's salary for the month of March 1866 as $208.33.
DeWitt Clinton Cregier had already been the pumping house engineer for 13 years by this time. Beginning as the engineer at the original Chicago Avenue station in 1853, he remained at that job until 1879 when he became the City Engineer, and subsequently the Commissioner of Public Works, and then Chicago's Mayor.
In 1933, officials dedicated a bronze plaque in Cregier's honor on the historic Water Tower. It is still in place and reads,
This tablet is erected in recognition of the outstanding services to the City of Chicago given by DEWITT CLINTON CREGIER
ENGINEER OF CHICAGO AVE. PUMPING STATION 1853-1879
CITY ENGINEER 1879-1882
COMMISSIONER OF PUBLIC WORKS 1882-1886
MAYOR OF CHICAGO 1889-1891