Episodic generation of dangerous waste

urgent alert icon

Unplanned events require immediate action!

Email or fax us within 72 hours of an unplanned event. You must also report a spill if the unplanned event involves any amount of dangerous waste or hazardous substances.

Impacted by natural disaster?
Sites may qualify to manage dangerous wastes from natural disasters as an unplanned event. Notify us within 72 hours of your waste determination (not from the time of the disaster itself).

The episodic generation rules allow small and medium quantity generators to maintain their current generator category, even when larger-than-normal waste amounts are generated from qualifying episodic events. Using this rule is optional.

An episodic event is an activity, either planned or unplanned, that:

You must also report a spill if:

  • Any unplanned event involves spills of dangerous waste or hazardous substances.
  • A spill poses a threat to human health or the environment, regardless of size.

Planned vs. unplanned episodic events

  • Planned events are episodic events you planned and prepared for, such as tank cleanouts, short-term projects, or removal of excess chemical inventory.
  • Unplanned events are unexpected episodic events, such as a production process upset, product recall, accidental spill, or "act of nature," such as a tornado, earthquake, flood, or wildfire.

You can manage waste from one event type per calendar year under this rule provided you notify us correctly and follow the instructions below.

How to notify Ecology of an episodic event 

To manage your dangerous waste under the episodic generation rules:

  1. Get an EPA/State Identification Number (if you don’t already have one).
  2. Follow the requirements for your type of episodic event.

How to manage waste from an episodic event

Regardless of the type of episodic event, there are specific storage, disposal, and reporting requirements you need to follow.

Storage and labeling requirements

Click to print or download our free label.

Accumulate episodic waste in tanks and containers that are:

  • In good condition and compatible with the waste.
  • Kept closed (except when adding or removing waste).
  • Labeled with “Episodic Dangerous Waste” or “Episodic Hazardous Waste,” hazards associated with the waste (e.g., ignitable, corrosive, reactive, toxic), and the episodic event start date.

Labels must be legible from 25 feet away or have letters at least 1/2 inch high. For one-gallon containers (four liters) or less, labels and lettering can be appropriate for the size of the container.

Disposal requirements

Send episodic waste to a treatment, storage, and disposal (TSD) facility within 60 calendar days from the start date of the event.

Note: Medium quantity generators (MQGs) can choose to treat episodic waste on-site within 60 calendar days from the event start date. All other generators must send episodic waste to a TSD.

Reporting requirements

Complete a Dangerous Waste Report for the previous year’s generation activity. You must report all episodic waste streams. While your generator category remains the same, episodic waste still counts towards the Hazardous Waste Planning Fee and Pollution Prevention (P2) Plan.

Frequently asked questions