| Ramblers Association | www.ramblers.org.uk |
| Relatives and Residents Association | www.relres.org |
| Royal Horticulture Society | www.rhs.org.uk |
| Royal Institue of British Architects | www.architecture.com |
| Royal Institute of Public Health (RIPH) | www.riph.org.uk |
| Royal Society for the Protection of Birds (RSPB) | www.rspb.co.uk |
| Royal Town Planning Institute | www.rtpi.org.uk |
| Royal Yachting Association | www.rya.org.uk |
| Scotland Europa | www.scotlandeuropa.com |
| Save Water Save Money | www.savewatersavemoney.co.uk |
| Scottish Environment Protection Agency (SEPA) | www.sepa.org.uk |
| The Scottish Government | www.scotland.gov.uk |
| Scottish Rural Property and Business Association | www.srpba.com |
| Scottish Water | www.scottishwater.co.uk |
| Severn Trent plc | www.severntrent.com |
| Socialist Environment and Resources Association (SERA) | www.serauk.org.uk |
| Society of British Water Industries (SBWI) | www.sbwi.co.uk |
| Soil Association | www.soilassociation.org |
| South East Water plc | www.southeastwater.co.uk |
| South Staffordshire Water plc | www.south-staffs-water.co.uk |
| South West Water Ltd | www.southwestwater.co.uk |
| Southern Water | www.southernwater.co.uk |
| Spanish Association of Water and Sewerage Service Providers | www.aeas.es |
| States of Guernsey Water Board | www.gov.gg |
| Stockholm International Water Institute | www.siwi.org |
| Surfers Against Sewage (SAS) | www.sas.org.uk |
| Sustainable Development Commission | www.sd-commission.gov.uk |
| Sutton & East Surrey Water plc | www.waterplc.com |
| Swiss Gas and Water Industry Association (SVGW) | www.svgw.ch |
