Restricted Wastes

Restricted waste includes:

Specified Waste

Any waste which, at the point of discharge into a sewer, contains any contaminant at a concentration in excess of the limits set out below. All concentrations are expressed as total concentrations which includes all forms of the contaminant, whether dissolved or undissolved. The concentration limits apply to both grab and composite samples. Contaminant definitions and methods of analysis are outlined in standard methods or methods specified by the manager.

Any of the contaminants listed below in tables (a), (b) or (c) that are present in a waste at dissolved concentrations in excess of the Hazardous Waste Regulation Leachate Quality Standards will qualify that waste, regardless of the sampling method used, as a hazardous waste. (Bylaw 3350)


Biochemical Oxygen Demand (BOD) 500
Chemical Oxygen Demand (COD) 1000
Oil and Grease* 100
Suspended Solids 350

Note: *Total oil and grease includes oil and grease (hydrocarbons) (see table (b))


Benzene 0.1
Ethyl Benzene 0.2
Toluene 0.2
Xylenes 0.2

Polynuclear Aromatic Hydrocarbons (PAH)**

Phenols 1
Oil and Grease (hydrocarbons) 15

Note: **Polynuclear Aromatic Hydrocarbons (PAH) include:

  • naphthalene benzo(a)anthracene
  • acenaphthylene chrysene
  • acenapthene benzo(b)fluoranthene
  • fluorene benzo(k)fluoranthene
  • phenanthrene benzo(a)pyrene
  • anthracene dibenzo(a,h)anthracene
  • fluoranthene indeno(1,2,3-cd)pyrene
  • pyrene benzo(g,h,i)perylene


Arsenic (As) 0.4
Cadmium (Cd) 0.3
Chloride (Cl) 1500
Chromium (Cr) 4
Cobalt (Co) 5
Copper (Cu) 1
Cyanide (CN) 1
Iron (Fe) 50
Lead (Pb) 1
Manganese (Mn) 5
Mercury (Hg) .02
Molybdenum (Mo) 5
Nickel (Ni) 3
Selenium (Se) .3
Silver (Ag) 0.5
Sulphate (SO4) 1500
Sulphide (S) 1
Zinc (Zn) 3

Food Waste

Any non-domestic waste from cooking and handling of food that, at the point of discharge into a sewer, contains particles larger than 0.5 centimetres in any dimension.

Radioactive Waste

Any waste containing radioactive materials that, at the point of discharge into a sewer, exceeds radioactivity limitations as established by the Canadian Nuclear Safety Commission. (Bylaw 3016)

pH Waste

Any non-domestic waste which, at the point of discharge into a sewer, has a pH lower than 5.5 or higher than 11.0, as determined by either a grab or a composite sample.

Dyes & Colouring Material

Dyes or colouring materials which may pass through a sewage facility and discolour the effluent from a sewage facility except where the dye is used by the District, or one or more of its municipalities, as a tracer.

Miscellaneous Restricted Wastes

Any of the following wastes as defined in the bylaw.

  • Seawater
  • PCBs
  • Chlorinated phenols including:
    • chlorophenol (ortho, meta, para)
    • dichlorophenol (2,3, 2,4-, 2,5-, 2,6-, 3,4-, 3,5-)
    • trichlorophenol (2,3,4-, 2,3,5-, 2,3,6-, 2,4,5-, 2,4,6-, 3,4,5-)
    • tetrachlorophenol (2,3,4,5-, 2,3,4,6-, 2,3,5,6-)
    • pentachlorophenol
  • Pesticides
  • Tetrachloroethylene