By 1913, the Water Works complex at Holy Cross Cemetery included several buildings integral to cemetery operations, and the demands of maintaining grounds subject to regular burials and service traffic led to an upgraded irrigation system and a central Pump House on a triangular lot between Mission Road and the Southern Pacific Railroad tracks. Directories from 1910 to 1923 also show the lot serving monument manufacturers including MT Carroll & Sons Co and Carroll Brothers, and a 1913 survey map showed an office building listed as 'Carrots,' a stone shed, and an accessory building with a polisher, compressed air tank, and saw shop; some of these buildings were retained after the companies shifted their operations and listed addresses opposite Holy Cross Cemetery by 1918. The Pump House was first built as a rectilinear building oriented toward the railroad, and by February 1914 plans had been established for a fifteen-foot-deep reinforced-concrete reservoir holding 111,000 gallons of water to be pumped through the Pump House and uphill to the cemetery. A 1917 photograph provides the earliest known photographic evidence of the building and shows it beside streetcar tracks on the east side of Mission Road and opposite several businesses. By August 1923, the Water Works lot had become a complex irrigation plant, with updated survey details showing the Pump House's faceted south bay, buttresses, and an eastern switch board, along with below-ground pipes linking pumps and wells in the building to an accessory well building and a reservoir northeast of the Pump House; north of the reservoir stood a carpenter shop, travelling crane, stone yard building, polishing house, and office with showroom. The cemetery's irrigation-related construction coincided with San Francisco's Bill 2853, Ordinance 2597, issued on January 14, 1914, and after ordinance-driven reinterments and regular burials from the mid-1920s into the early 1940s, Holy Cross Cemetery remained a leading cemetery in Colma. In the 1970s, a new pump house was built elsewhere in the cemetery, and the historic Pump House was leased to tenants for machine-shop and automotive-maintenance use; throughout this history, Colma cemeteries with complex landscapes depended heavily on high-quality irrigation systems to maintain their grounds.