Federal Act
on the Protection of Waters
(Waters Protection Act, WPA)

Build­ing per­mits for new build­ings and build­ing al­ter­a­tions shall be gran­ted only if:

a.

in areas served by pub­lic sew­ers, pol­luted waste wa­ter is dis­charged in­to the sew­ers (Art. 11 para. 1) or used for ag­ri­cul­tur­al pur­poses (Art. 12 para. 4);

b.

out­side areas served by pub­lic sew­ers, the ap­pro­pri­ate dis­pos­al of pol­luted waste wa­ter is en­sured through spe­cial pro­ced­ures (Art. 13 para 1); the can­ton­al wa­ter pro­tec­tion agency shall be con­sul­ted to this ef­fect;

c.

there is a guar­an­tee that waste wa­ter which is un­suit­able for treat­ment by a cent­ral waste wa­ter treat­ment plant may be dis­posed of in an ap­pro­pri­ate man­ner (Art. 12 para. 2).