The Spanish legislative authority implemented the European Drinking Water Directive with the Royal Decree 140/2003 from 07.02.2003 which set out the health criteria for the quality of water for human consumption.
Together with the Royal Decree 865/2003, which set out concrete criteria for sanitary hygiene, the legislative authority ensures the highest possible protection of consumers against health risks caused by unclean water or water contaminated with dangerous germs (e.g. Legionella).
In the extraction, processing and distribution of water in pipelines, the water is naturally changed by the release of substances from metal or plastic pipes, limescale deposits, corrosive deposits or the infiltration of biofilms. It is crucial for this change to be so low as to not fear health risks. While the providers and health authorities have received explicitly prescribed strict requirements for the monitoring and inspection of water, the regular inspection and monitoring of domestic installations is not explicitly required.
Spanish Regulations (Royal Decree 140/2003)
ART. 5 – LIMIT REGULATIONS FOR DRINKING WATER
Drinking water must be harmless and clean and must not show harmful concentrations of micro-organisms, parasites or substances (requirements according to Appendix 1, Part A [microbiological parameters] and Part B [chemical parameters]).
REQUIREMENTS FOR SUBSTANCES FOR WATER PURIFICATION AND PROCESSES
Any substance must meet the relevant EN standard and is subject to the Royal Decrees 1054/2002, 363/1995, 1978/1993 and 1712/1991. The Ministry of Health is responsible for updating the list in APPENDIX II. Operators of water treatment facilities must be able to provide a certificate and the approval of the health authority for each substance.
ART. 10, ART. 14 – WATER TREATMENT IN BUILDINGS
Water treatment equipment in buildings (Art.10) must not release any substances or germs that are undesirable or harmful to health and must meet requirements for construction products (Art.14). The marketing of this equipment is subject to prior approval (DVGW or Spanish approval).