Waters Protection Ordinance
(WPO)

¹ The au­thor­it­ies shall au­thor­ise dis­charge of waste wa­ter from in­dustry ac­cord­ing to An­nex 3.2 or of oth­er waste wa­ter ac­cord­ing to An­nex 3.3 in­to pub­lic sew­ers if the re­quire­ments of the rel­ev­ant An­nex are com­plied with.

² They shall set ad­di­tion­al or stricter re­quire­mentsif by dis­charge of waste wa­ter:

a.

op­er­a­tion of pub­lic sew­ers may be re­strict or dis­rup­ted;

b.

in the case of waste wa­ter from the cent­ral waste wa­ter treat­ment plant, the re­quire­ments on dis­charge in­to a body of wa­ter are not met or may only be met by dis­pro­por­tion­ate meas­ures, or could re­strict or dis­rupt the op­er­a­tion of the plant in an­oth­er way; or

c.⁸

...

d.

the op­er­a­tion of the plant in which sludge is in­cin­er­ated may re­stric­ted or dis­rup­ted.

³ They may ap­ply less strin­gent re­quire­ments if:

a.

by re­du­cing the amounts of waste wa­ter dis­charged, few­er po­ten­tial wa­ter pol­lut­ants are dis­charged even though the con­cen­tra­tions al­lowed are high­er; or

b.

the en­vir­on­ment as a whole will be less im­paired by the dis­charge of non-re­cyc­lable sub­stances in in­dus­tri­al waste wa­ter than by an­oth­er dis­pos­al meth­od,and in the case of waste wa­ter from the cent­ral waste wa­ter treat­ment plant, re­quire­ments on dis­charge in­to a body of wa­ter are met; or

c.

this is ap­pro­pri­ate for the op­er­a­tion of the waste wa­ter treat­ment plant.