Waters Protection Ordinance
(WPO)

¹ The can­tons shall en­sure that gen­er­al drain­age plans (GDP) are drawn up which guar­an­tee ad­equate wa­ters pro­tec­tion in com­munes and ef­fect­ive drain­age of hous­ing areas.

² The GDP shall spe­cify as a min­im­um:

a.

waste wa­ter treat­ment areas that must be served by pub­lic sew­ers;

b.

areas in which pre­cip­it­a­tion wa­ter run­ning off built-up or sealed sur­faces must be dis­posed of sep­ar­ately from oth­er waste wa­ter;

c.

areas in which non-pol­luted waste wa­ter must be al­lowed to in­filt­rate;

d.

areas in which non-pol­luted waste wa­ter must be dis­charged in­to sur­facewa­ters;

e.

meas­ures by which non-pol­luted waste wa­ter with per­man­ent flow must be kept away from waste wa­ter treat­ment plants;

f.

the loc­a­tions where waste wa­ter treat­ment plantsmust be set up, and withwhich treat­ment sys­tem and with what ca­pa­city;

g.

areas in which sys­tems oth­er than waste wa­ter treat­ment plants must be used, and how, in these areas, waste wa­ter is to be dis­posed of.

³ The GDP shall be ad­jus­ted if ne­ces­sary:

a.

to take ac­count of de­vel­op­ments in hous­ing areas;

b.

if a RDP is drawn up or changed.

⁴ It shall be ac­cess­ible to the pub­lic.