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Wastewater Service

Treating wastewater to protect the environment and the residents of Halifax

Water that has been used in your home, business, or as part of an industrial process is now waste.

The wastewater system refers to the structures, pipes, devices, equipment, processes and related equipment used to collect, transport, pump or treat wastewater.

The Wastewater System

Wastewater is broken into two categories and is managed through separate systems within the Halifax region:

Wastewater (sanitary sewer) system: this includes substances such as human waste, food scraps, oils, soaps, and chemicals. In homes, this includes water from sinks, showers, bathtubs, toilets, washing machines, and dishwashers. Businesses and industries also contribute their share of used water that must be cleaned.

Stormwater system, or storm runoff: although some people assume that the rain that runs down the street during a storm is fairly clean, it isn’t. Harmful substances that wash off roads, parking lots, and rooftops can harm our rivers and lakes.

Halifax Water’s wastewater infrastructure includes various components such as:

  • Sanitary sewers
  • Manholes
  • Wastewater Treatment Facilities
  • Force mains
  • Pumping stations



Where Does My Wastewater Go?

Halifax Water owns and operates seven large Wastewater Treatment Facilities and seven smaller community wastewater treatment plants which serve smaller communities in Halifax Municipality.

Do you know where your wastewater goes? Type in your address on the map below and find out!

You can view the Where Does My Wastewater Go map in a new browser window.

Wastewater Treatment

The major aim of wastewater treatment is to remove as much of the pollutants and suspended solids as possible before the remaining water—called effluent—is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water.

Each treatment facility uses a combination of physical, biological, and chemical treatment stages. The degree or level of treatment required often depends on:

  • The nature and quality of the receiving water (i.e., salt water, inland fresh water bodies, etc.)
  • Federal and provincial regulations
  • Quantity of flow from the treatment plant
  • Uses and existing quality of receiving waters
  • The amount of mixing between plant effluent and receiving waters
  • Assimilation capacity of the receiving water

Advanced Primary Treatment

The Halifax, Dartmouth, and Herring Cove wastewater treatment facilities all utilize advanced primary wastewater treatment technology. The advanced primary treatment process removes up to 70% of the suspended solids in the wastewater.

Bio-Solids Management

The solid material collected from wastewater during the treatment process, also known as bio-solids, is a beneficial organic resource. Rather than dump this material in a landfill or the incinerator, the Halifax Regional Municipality puts it through something called the N-Viro process.

The N-Viro process delivers a safe, high-quality product, suitable for a number of applications such as:

  • Soil amendment
  • Fertilizer product
  • Lime substitute
  • Sod farming

The final product must meet USEPA Class A standards for bio-solids products, and also meet Canadian Food Inspection Agency requirements under the Canadian Fertilizer Act, for labelling as a fertilizer product for sale in Canada.

Ultra Violet (UV) Disinfection System

The Halifax, Dartmouth, and Herring Cove wastewater treatment facilities also use Ultra Violet (UV) disinfection. UV disinfection means that high-intensity, ultra-violet lights are used to kill bacteria in the treated flows. This is the final stage in the treatment process before the effluent is released into the harbour.