Some signs I found when remodeling my back room. Anyone have an idea of how old they might be?

Each sign is about 12" tall by 20" wide.
These were found during what we think is the very first renovation of a crumbling old storage room in what used to be a root cellar in the Humboldt Island Historic District in Denver Colorado. This portion of the house was apparently built in 1859, and appears to have been flooded (probably in the huge 1869 Denver flood) and left to decay. It had been used as a coal room at one point, as well as a food storage pantry, and a general storage room, until we hauled a foot of deposited silt out of the room and remodeled it into a lab space.
The water sign cannot be older than 1918, since Denver Water Department was not created until that year.
We estimate that the water sign cannot be newer than about the late 40s to early 50s, because of both the lettering style and the fact that these are hand painted but city issued.
Any help determining an actual date would be extremely helpful.