The federal and cantonal authorities may carry out surveys on private and public bodies of water. They may set up the equipment necessary for this purpose, and they may inspect installations. Owners of land and persons responsible for installations shall ensure that persons entrusted with such duties are allowed access, and they shall provide them with all the information that they may require.
Persons entrusted with enforcing this Act, as well as experts and members of commissions and specialised bodies, shall be subject to the rules of professional secrecy.