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Greater Nanaimo Pollution Control Centre

In keeping with the Liquid Waste Management Plan, some major changes are planned for GNPCC. Click on one of the buttons below to learn more.

Secondary Treatment       GNPCC Outfall
Wastewater from approximately 93,000 people in the City of Nanaimo, Snuneymuxw First Nation, and parts of Lantzville is treated at the Greater Nanaimo Pollution Control Centre (GNPCC). Wastewater is gravity fed and pumped to GNPCC via three pump stations - Wellington Pump Station, Departure Bay Pump Station and Chase River Pump Station. The Chase River Pump station also has a septage receiving site that accepts septage from residential onsite (septic) systems and wastewater from pump-and-haul clients.

The GNPCC uses chemically-enhanced primary treatment to remove 30-40% of BOD and 50% of TSS. It also uses a cogeneration system that converts waste gas from the digesters to electricity that can be used to power the plant. To learn more, please visit our Treatment Processes page. Upgrades are underway to provide secondary treatment to improve effluent quality. Secondary treatment is able to remove up to 90% of BOD and 50% of TSS.

Effluent is discharged into the Strait of Georgia 2,030 m offshore at a depth of 70 m. A study is now underway to determine the scope of a Receiving Environment Monitoring Program to monitor the effects of the disposal of effluent to the marine environment.

Replacement of the GNPCC outfall
Replacement of the GNPCC outfall

Construction of the third digester

Cogeneration facilities at GNPCC

1974 GNPCC circa 1974

Fast Facts (2015 Data)

  GNPCC Effluent Permit Levels
Ministry of Environment Environment Canada
Average Daily Flow 34,991 m3/day 40,950 m3/day n/a
Average Daily BOD5/CBOD (effluent) 99.0 mg/L 130 mg/L 140 mg/L
Average Daily TSS (effluent) 67.9 mg/L 130 mg/L 93 mg/L
Un-ionized Ammonia 0.15 mg/L n/a 1.25 mg/L

Major Projects & Improvements

2014-2016Upgrading and replacing the outfall
2013Construction of Sedimentation Tank 4, to improve plant efficiencies and support increasing flows
2011-2013Construction of a third digester to improve plant efficiencies and support increasing flows
2009-2012Construction and commissioning of a Cogeneration system
2008-2012Phase II Odour Control installed
2007-2009Gravity Thickeners constructed to improve solids handling
2005-2007Phase I Odour Control installed
2002Introduction of Chemically Enhanced Primary Treatment
1988-1990Stage II expansion to improve plant efficiencies and support increasing flows
1972The RDN took over operational responsibility of GNPCC
1971-1974Construction of GNPCC with Primary Treatment, ending the discharge of raw sewage to the Strait of Georgia.

Studies and Planned Improvements

2016Draft Receiving Environment Monitoring Program
2016Departure Bay Pump Station Upgrade
2017-2019Upgrade to Secondary Treatment

Wastewater Services | 6300 Hammond Bay Road | Nanaimo, BC V9T 6N2 | E-mail: rcu@rdn.bc.ca
Telephone: 250-390-6560 (Nanaimo) 250-954-3792 (Oceanside) 1-877-607-4111 (Toll Free)
1-800-862-3429 (Emergency) | 250-390-1542 (Fax)
Last Modified:  Jul 11, 2016
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