4,265 of them took care of the collection, treatment and distribution of water and of sewerage and were as such most closely related to the supply and security of drinking water.
Med temi jih je 4.265 skrbelo za zbiranje, prečiščevanje in distribucijo vode ter za ravnanje z odplakami; te osebe so bile pri svojem delu v najožjem smislu povezane z zagotavljanjem pitne vode in s skrbjo za njeno neoporečnost za vse nas.