The publication Wastewater treatment in Sweden, published by the Swedish Environmental Protection Agency, gives an overview of the subject. The Swedish Environmental Code sets the environmental standards for the country.  The provisioning of water and wastewater is regulated by the Public Water Supply and Wastewater Systems Act (SFS 2006:412).  Councils must supply water and sewerage for villages, defined as 20 to 30 households. The SWaM's general recommendations for small-scale wastewater treatment systems (HVMFS 20016:17) provide guidance for municipal authorities regarding the enforcement of environmental and health safety safeguard requirements for small-scale systems.