Waters Protection Ordinance
(WPO)

of 28 October 1998 (Status as of 1 February 2023)


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Art. 9 Waste water of specific origin

1 Pol­luted waste wa­ter oc­cur­ring out­side pub­lic sew­ers for which neither dis­charge in­to wa­ters, nor in­filt­ra­tion, nor use com­bined with farm ma­nure (Art. 12 para. 4 WPA) is per­mit­ted must be col­lec­ted in a cesspit which is reg­u­larly emp­tied with its con­tents be­ing trans­ferred to a cent­ral waste wa­ter treat­ment plant or fa­cil­ity for spe­cial treat­ment.

2 Waste wa­ter from pro­cessing farm ma­nure, hy­dro­ponics and oth­er hor­ti­cul­tur­al meth­ods must be used in an en­vir­on­ment­ally com­pat­ible man­ner and re­used ag­ri­cul­tur­ally or hor­ti­cul­tur­ally ac­cord­ing to the state of the art.

3 Waste wa­ter from mo­bile san­it­a­tion fa­cil­it­ies must be col­lec­ted and may be dis­charged in­to pub­lic sew­ers only by us­ing equip­ment in­ten­ded for this pur­pose. Ex­cluded from this are san­it­a­tion fa­cil­it­ies in:

a.
rail­way car­riages with their own waste wa­ter treat­ment fa­cil­it­ies;
b.
rail­way car­riages for long-dis­tance traffic which were com­mis­sioned be­fore 1 Janu­ary 1 1997;
c.
rail­way car­riages for re­gion­al or urb­an traffic which were com­mis­sioned be­fore 1 Janu­ary 2000.

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