Ordinance
on the Remediation of Polluted Sites
(Contaminated Sites Ordinance, CSO)

¹ The can­tons shall en­force this Or­din­ance un­less it del­eg­ates en­force­ment to the Con­fed­er­a­tion.²³ The can­tons shall sub­mit the in­form­a­tion re­quired in Art­icle 5 para­graphs 3 and 5 and Art­icle 6 as well as the in­form­a­tion on re­medi­ated sites re­quired by Art­icle 17 to the FOEN by the end of each cal­en­dar year.²⁴

^1bis The FOEN shall eval­u­ate the in­form­a­tion and in­form the pub­lic reg­u­larly on the pro­gress with the re­medi­ation of con­tam­in­ated sites.²⁵

² If fed­er­al au­thor­it­ies ap­ply oth­er fed­er­al acts or agree­ments or de­cisions un­der in­ter­na­tion­al law that re­late to the sub­ject mat­ter of this Or­din­ance, they shall also en­force this Or­din­ance. The co­oper­a­tion of the FOEN²⁶ and of the can­tons is gov­erned by Art­icle 41 para­graphs 2 and 4 EPA; stat­utory du­ties of secrecy are re­served. If the fed­er­al au­thor­it­ies dis­pense with is­su­ing a rul­ing when spe­cify­ing re­medi­ation meas­ures (Art. 23 para. 3), they shall con­sult the can­tons con­cerned about the in­ten­ded meas­ures.²⁷

³ The fed­er­al au­thor­it­ies shall de­term­ine the pro­ced­ures for cat­egor­ising pol­luted sites (Art. 5 para. 4), pre­par­ing the list of pri­or­it­ies (Art. 5 para. 5) and de­let­ing entries in the Re­gister (Art. 6 para. 2) after con­sulta­tion with the FOEN.²⁸

⁴ They shall in­form the can­tons con­cerned of the con­tent of the Re­gister (Art. 5 and 6) at reg­u­lar in­ter­vals. These shall in­clude a ref­er­ence to the rel­ev­ant pol­luted sites in their own re­gister.