The holder of an operating licence must declare to the Prefect any project to modify the installations and operating conditions mentioned in the prefectoral authorisation order and send him all the information needed to assess the project, prior to its implementation.
The Prefect decides on this declaration within two months, either by issuing an amending order, or, in application of II of article L. 1322-1, by inviting the holder of the authorisation, where appropriate after consultation with a public health hydrogeologist under the conditions laid down in article R. 1321-14, to request a revision of the initial authorisation. If no decision is taken within this period, the proposed amendment is deemed to have been accepted.
A hydrogeologist must be consulted when the changes requested concern the operating flow rate.
In the event of modification of the installations and operating conditions, a new verification, carried out under the conditions provided for in article R. 1322-9, is carried out before the installations are put back into service.