Waters Protection Ordinance
(WPO)

¹ The in­filt­ra­tion of pol­luted waste wa­ter is pro­hib­ited.

² The au­thor­it­ies may au­thor­ise the in­filt­ra­tion of com­mun­al waste wa­ter or of oth­er pol­luted waste wa­ter of com­par­able com­pos­i­tion, if:

a.

the waste wa­ter has been treated and meets the re­quire­ments for dis­charge in­to wa­ters;

b.

in the case of the ground­wa­ter con­cerned, wa­ter qual­ity re­quire­ments ac­cord­ing to An­nex 2 are met after in­filt­ra­tion of the waste wa­ter;

c.

in­filt­ra­tion en­sues at an in­stall­a­tion in­ten­ded for the pur­pose, the dir­ect­ives of the SoilPO⁹ are not ex­ceeded even in the long term, or in the ab­sence of dir­ect­ives soil fer­til­ity is also guar­an­teed in the long term; and

d.

re­quire­ments val­id for waste wa­ter treat­ment plants which dis­charge waste wa­ter in­to a body of wa­ter are met (Arts. 13–17).