Door threshold system for a front door, a tilt and turn door or the like, with a door frame with a sill and at least one revolving door leaf, wherein the sill comprises a base body (21; 21'; 21"; 21" '), wherein the revolving door leaf has at least one stop fold (34, 35) that interacts with at least one stop (21 a, 21 b) on the base body (21; 21'; 21"; 21′′′). and creates a sealing plane, wherein the base body (21; 21'; 21'; 21′′′) has a tread area (22; 22'; 22"; 22′′′) that provides a tread surface and serves for water drainage to the outside, wherein the tread area (22; 22'; 22"; 22′′′) is designed in the manner of a grid and has at least one water collection chamber (22b, 22b'; 22b") with a drainage slope in the floor area, and wherein moisture enters through an inlet opening into the at least one water-collection chamber (22b; 22b'; 22b") and exits via outlet openings (22d; 22d') to the outside, characterised by a drainage slope in the floor area of the water collection chamber (22b, 22b'; 22b") and by a bar that opposite the tread area (22; 22'; 22"; 22"') extends perpendicularly to it from the drainage slope, is designed on the base body side to the system on the base body (21; 21'; 21'; 21′′′) and extends along a vertical side of the base body (21; 21'; 21'; 21′′′) and towards an outer side and forms a contact surface for a sealing sheet (26; 26'), wherein the bar is part of a base for a modified designed tread area (22") that is designed from a metal profile element and is carried on the attachment mounted on the base body (21") or is part of the tread area (22; 22'; 22") manufactured as an aluminium profile and screwed to the base body (21; 21'; 21"). wherein the sill comprises a base body (21; 21'; 21"; 21" '), wherein the revolving door leaf has at least one stop fold (34, 35) that interacts with at least one stop (21 a, 21 b) on the base body (21; 21'; 21"; 21′′′). and creates a sealing plane, wherein the base body (21; 21'; 21'; 21′′′) has a tread area (22; 22'; 22"; 22′′′) that provides a tread surface and serves for water drainage to the outside, wherein the tread area (22; 22'; 22"; 22′′′) is designed in the manner of a grid and has at least one water collection chamber (22b, 22b'; 22b") with a drainage slope in the floor area, and wherein moisture enters through an inlet opening into the at least one water-collection chamber (22b; 22b'; 22b") and exits via outlet openings (22d; 22d') to the outside, characterised by a drainage slope in the floor area of the water collection chamber (22b, 22b'; 22b") and by a bar that opposite the tread area (22; 22'; 22"; 22"') extends perpendicularly to it from the drainage slope, is designed on the base body side to the system on the base body (21; 21'; 21'; 21′′′) and extends along a vertical side of the base body (21; 21'; 21'; 21′′′) and towards an outer side and forms a contact surface for a sealing sheet (26; 26'), wherein the bar is part of a base for a modified designed tread area (22") that is designed from a metal profile element and is carried on the attachment mounted on the base body (21") or is part of the tread area (22; 22'; 22") manufactured as an aluminium profile and screwed to the base body (21; 21'; 21").