2016-02-02 P&O Committee - Item 3 - Attachment 3 - Noosa River Environmental Values and Water Quality Objectives

Noosa River environmental values and water quality objectives




Table 13 Drinking water EV: Priority water quality objectives for drinking water supply in the vicinity
of off-takes, including groundwater, before treatment

Indicator                    Water quality objectives
Hardness                     60-200 mg/L (as CaCO3) Refer ADWG (treated water guideline)

Taste and odour              5 µg/L Geosmin or 10 µg/L MIB or 10 µg/L combined Geosmin & MIB

Cyanotoxins (specific        Saxitoxin 3 µg/L (ADWG health alert value for acute exposure; and
assessment of                SEQWater Toxic Cyanobacteria Risk Assessment 2006)
treatment step
efficiencies for each        Mycrocystin 1.3 µg/L (ADWG treated water guideline)
toxin is required)
                             Cylindrospermopsin 1 µg/L
Cryptosporidium              0 oocyst

Giardia                      0 cyst

E. coli                      100 cfu/100mL
                             (ensure sufficient turbidity reduction and chlorine contact:dose)
Manganese (soluble)          50 µg/L

Iron (soluble)               50 µg/L

Turbidity                    25 NTU for WTP designed for offtakes from open water storages
                             50 NTU for WTP designed for offtakes in riverine (weir) systems
Colour                       50 Hazen Units

Conductivity/TDS             See ADWG (no treatment options to remove salt) 500 mg/L TDS. Site
                             specific conversion to conductivity required. ADWG recommends
                             average multiplication factor of 2 to derive conductivity (µs/cm):
                             1000 µs/cm
Dissolved oxygen             4 mg/L at water surface

Pesticides                   Presence at detectable levels (detection limits specified by Qld Health
                             Scientific Services)
Dissolved Organic            10 mg/L
Carbon

Source: Queensland Bulk Water Supply Authority Trading as: Seqwater




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