Environmental Health & Safety
environmental services/hazardous waste
City of Pullman
Industrial Pretreatment Program
Local Limits
Below are listed the current maximum allowable concentrations that may be discharged to the City's sewage system.
| Parameter | Maximum Concentration |
| Arsenic (As) | 1.00 mg/L |
| Cadmium (Cd) | 0.11 mg/L |
| Chromium, hexavalent (Cr) | 0.25 mg/L |
| Chromium, total (Cr) | 1.00 mg/L |
| Cyanide, free (CN) | 0.20 mg/L |
| Cyanide, total (CN) | 0.64 mg/L |
| Lead (Pb) | 0.40 mg/L |
| Mercury (Hg) | 0.05 mg/L |
| Nickel (Ni) | 1.00 mg/L |
| Silver (Ag) | 0.20 mg/L |
| Zinc (Zn) | 1.00 mg/L |
| Benzene | 0.13 mg/L |
| Toluene | 1.50 mg/L |
| Ethylbenzene | 1.40 mg/L |
| Non-polar fats, oil & grease | 50 mg/L |
| Explosion hazard meter (1 rdg.) | 10% LEL |
| Explosion hazard meter (2 successive rdgs.) | 5% LEL |
| pH | 6-9 |
| Temperature | 40 degrees C |
| Biological Oxygen Demand (BOD) | Situation dependent |
| Chemical Oxygen Demand (COD) | Situation dependent |
| Total suspended solids (TSS) | Situation dependent |
| Ammonia (NH3-N) | Situation dependent |
NOTE:
1. mg/L = milligrams per liter
2. LEL = Lower Explosive Limit
3. Other limits may be imposed depending on the water/wastewater to be
discharged.
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