| WHO | http://www.who.int/en/ |
| (Household Water Treatment Safe storage) | http://www.who.int//household_water/en/ |
| WSSCC | http://wash-cc.org/ |
| IWA | http://www.iwahq.org/ |
| IRC | http://www.irc.nl/ |
| WBK | http://www.worldbank.org/ |
| WEDC | http://wedc.lboro.ac.uk/ |
| SKAT | http://www.skat.ch/ |
| JICWELS ((Japanese only)) | http://www.jicwels.or.jp/index.html |
| JICA | http://www.jica.go.jp/ |