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Local Discharge Limits are specific rules that businesses must follow when they send wastewater into the sewer system. These limits help keep the treatment plant running safely and smoothly, protect workers, and prevent harmful pollutants from reaching the Willamette River. They also help ensure that treated waste can be disposed of properly and that plant operations are not disrupted.
Local Discharge Limits are one of several tools used by WES’ Industrial Pretreatment Program to meet requirements set by the Oregon Department of Environmental Quality (DEQ).
| Pollutant | Limit (expressed as a daily maximum in mg/L) |
|---|---|
| Arsenic | 0.16 |
| Cadmium | 0.24 |
| Chromium | 2.77 |
| Copper | 3.38 |
| Lead | 0.81 |
| Mercury | 0.0035 |
| Nickel | 2.45 |
| Silver | 0.43 |
| Zinc | 2.61 |
| Cyanide, total | 1.20 |
| Total Toxic Organics | 2.13 |
| Oil and Grease (total) | 100 |
| Oil and Grease (non-polar) | 100 |
| Oil and Grease (polar) | 300 |
