NHB Water Treatment Plant Sign Uploaded · February 6, 2017 If you liked this item, please rate it up on Steam Workshop page. Author: rawberth Last revision: 23 Nov, 2016 at 02:40 UTC File size: 2.27 MB On Steam Workshop Description: Sign for the NHB Water Treatment Plant. Do you like my assets? Please donate![www.paypal.com] Download Required DLC:These DLC should be installed in order to use this item.Cities: Skylines - After Dark