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Many heavy metals are regulated by the EPA and thus cannot go down the drain. Additionally, certain metals pose a high toxicity hazard and also may not go down the drain. These include:
The above chart lists all metals which should be collected for off-campus disposal (metals in bold are RCRA and should be collected as hazardous waste).
Additionally, local ordinance restricts the following metals from entering the City of Richmond sanitary sewer system above certain concentrations:
Copper: 1.5 mg/LZinc: 2 mg/L
Note: If the metals waste generated contains solvent, it should be collected separately from metals waste that is aqueous.