Káraný water works, Water supply facility in Káraný, Czech Republic

Káraný Water Works is a waterworks in the village of Káraný near the confluence of the Elbe and Jizera, where groundwater is drawn from 685 wells about 250 m from the Jizera and from artesian wells 60–80 m deep. Water from all three sources is mixed and chlorinated here before being pumped to Prague.

Prague's water shortage led to Act No. 48 of 16 August 1899, and Leipzig hydrogeologist Adolf Thiem's project for the Káraný springs was chosen. A 3.7 km railway siding opened on 1 June 1906 to carry building material. Trial pumping from 220 wells ran on 18 October 1912, and full operation began on 1 January 1914 with 880 l/s drawn from 567 wells.

The Káraný works mixes water from three sources: bank infiltration from the Jizera, artificial infiltration begun in 1968, and artesian water from 60–80 m deep wells. The artesian water is aerated and filtered to remove its high iron content. The plant supplies Prague and also Brandýs nad Labem-Stará Boleslav, Čelákovice and Lázně Toušeň.

The waterworks stands in Káraný near the confluence of the Elbe and Jizera, reached from Prague by the railway line through Lysá nad Labem and Čelákovice. The site once had its own 3.7 km siding, opened in 1906 and dismantled in 2007, so no rail access remains. The three supply mains run to the Flora and Ládví reservoirs in Prague.

The 3.7 km railway siding built in 1906 to haul construction material was declared a public-benefit project; it outlasted the steam engines, closing only on 31 March 2003 and later dismantled despite local opposition.