The Laboratory Services Notification (LSN) form is to be used by small drinking water system owners/operators to notify the local public health unit in writing as to which licensed laboratories will test drinking water samples for their small drinking water systems.

Filled out by all regulated DWS, this form sets up the agreement between the DWS and an accredited lab to undertake all regulated testing. Form must be completed and submitted before any water samples are ever submitted to the lab.