| Column 1 | Column 2 | Column 3 | |
| Parameter | | Standard* for Discharges to the Environment or to Storm Sewers | Standard* for Discharges Directed to Municipal or Industrial Effluent Treatment Works |
| |
| |
| | |
| Physical | | | |
| pH | 6.5 to 8.5** | 5.0 to 11.0** |
| Temperature | 32º C | — |
| Total suspended solids | 20 | — |
| Toxicity (limit bioassay — 50% survival of Rainbow trout after 96 hours) | 100% effluent | 50% effluent |
| Inorganics | | |
| Aluminum, dissolved | 0.5 | 2.0 |
| Ammonia, total (expressed as nitrogen) | 2.0 | — |
| Antimony, dissolved | 0.25 | 0.5 |
| Arsenic, dissolved | 0.1 | 0.3 |
| Barium, dissolved | 1.0 | 2.5 |
| Boron, dissolved | 10.0 | 15.0 |
| Cadmium, dissolved | 0.05 | 1.0 |
| Chromium, dissolved (hexavalent) | 0.1 | 0.2 |
| Chromium, total | 0.5 | 1.0 |
| Cobalt, dissolved | 0.1 | 0.3 |
| Copper, dissolved | 0.1 | 0.3 |
| Cyanide (weak acid dissociable) | 0.1 | 0.2 |
| Fluoride, dissolved | 15 | 18 |
| Lead, dissolved | 0.1 | 0.3 |
| Manganese, dissolved | 0.5 | 1.0 |
| Mercury, total | 0.001 | 0.01 |
| Molybdenum, dissolved | 0.5 | 1.0 |
| Nickel, dissolved | 0.5 | 1.0 |
| Selenium, dissolved | 0.05 | 0.1 |
| Tin, dissolved | 0.5 | 1.0 |
| Zinc, dissolved | 0.2 | 0.5 |
| Organics | | | |
| 5 day Biochemical oxygen demand (BOD) | 20 | — |
| Dioxin TEQ | 15 pg/l | pg/l |
| Oil | 10 | 60 |
| Phenol | 0.2 | 0.5 |
| Polychlorinated biphenyls, total | 0.005 | 0.005 |
| Total chlorinated phenol | 0.006 | 0.05 |
| Total organic halogens (as Cl) | 1.0 | 1.0 |
| * | Maximum concentration or range in (mg/l) unless otherwise specified. pg/l is the abbreviation for picograms per litre. |
| ** | pH units are the negative log of the hydrogen ion concentration. |
| Note: Local municipal requirements may be more restrictive. |