South East Queensland
11.4 Wastewater collected

This line item consists of the wastewater collected by the wastewater collection system within the South East Queensland (SEQ) region. As data were not available for line item 11.7 Stormwater ingress and line item 11.8 Infiltration from groundwater and the only data available for this line item was wastewater treatment plant (WWTP) inflow, this line item actually represents WWTP inflow as a proxy for wastewater collected. The overestimation for this line item is offset by the under estimation for line item 11.7 Stormwater ingress and line item 11.8 Infiltration from groundwater.

Wastewater treatment plant inflow by urban utility

Urban utility	Wastewater treatment plant (WWTP)	Volume (ML)
AllConnex Water	Beenleigh	5,653
	Capalaba	2,192
	Cleveland	3,193
	Coombabah	26,437
	Elanora	10,005
	Flagstone	111
	Jimboomba	87
	Logan Village	20
	Loganholme	20,234
	Merrimac	14,027
	Mount Cotton	337
	Pimpama	2,519
	Thorneside	3,300
	Victoria Point	3,065
	Total AllConnex	91,180
Queensland Urban Utilities	Aratula	19
	Beaudesert	541
	Boonah	213
	Bundamba	7,109
	Canungra	68
	Carole Park	1,573
	Esk Shire	99
	Fairfield	1,324
	Fernvale	100
	Forest Hill	46
	Gatton Shire	723
	Gibson Island	20,688
	Goodna	5,147
	Helidon	60
	Kalbar	49
	Karana Downs	164
	Kilcoy Shire	177
	Kooralbyn	60
	Laidley Shire	351
	Lowood	156
	Luggage Point	66,636
	Nudgee	59
	Oxley	26,745
	Rosewood	173
	Sandgate	10,248
	Toogoolawah	98
	Wacol	2,138
	Wynnum	4,419
	Total Queensland Urban Utilities	149,183
Unitywater	Brendale	3,027
	Burpengary East	3,387
	Caboolture	5,586
	Dayboro	74
	Landsborough	937
	Murrumba Downs	8,792
	Redcliffe	6,862
	Woodford	186
	Total Unitywater	28,851
Total SEQ region		269,214

Unity water daily WWTP inflow data. AllConnex Water and Queensland Urban Utilities annual WWTP inflow data.

Bureau of Meteorology.

Most of the individual discharges into the wastewater collection system are not metered and data on trade waste discharges were not available. Metered data for inflow into the WWTPs were available and  were used to populate this line item. If data for line item 11.7 Stormwater ingress and line item 11.8 Infiltration from groundwater from groundwater were available, this would have been removed from the WWTP data to estimate wastewater collected by the wastewater collection system. As data were not available for these line items, the wastewater collected was assumed to be the entire WWTP inflows.

Including all WWTP inflow in this line item has resulted in an overestimation of wastewater collection, expected to be in the order of around 20–60%. The overestimation for this line item is offset by the underestimation for line item 11.7 Stormwater ingress and line item 11.8 Infiltration from groundwater. With the development of methods for calculating stormwater ingress and groundwater infiltration, the WWTP inflow represented in this line item in the 2011 Account may be split across line item 11.4 Wastewater collected, line item 11.7 Stormwater ingress and line item 11.8 Infiltration from groundwater in future accounts.

The uncertainty estimate was not quantified.

This line item was not included in the 2010 Account as retail customers of the urban water system were considered to be part of the urban water system. The supply of urban water to, and collection of wastewater from, these retail customers was considered to be a within store flow and was not included in the 2010 Account water accounting statements.

Wastewater collected was included in the Urban water region note of the 2010 Account. The volume reported in this note of 212,085 ML has been included in the 2011 Account as the comparative year volume for this line item.