Approved Contractors List Rotorua Lakes Council has a list of approved contractors for water utilities including stormwater, drinking water and wastewater. You can download a printable list by clicking the following link. Download a list of approved contractors - PDF, 124KB Rotorua Lakes Council Approved Contractor List codes:Water Contractors Level 1 = (W1) Stormwater = (SW) Low Pressure Grinder Pump - Sewer = (LPGP) Water Contractors Level 2 = (W2) Wastewater = (WW)