California waste code 231 Wash water from spraying, mixing & cleaning pesticide equipment.
- Free, no account
- Based on California Title 22 and DTSC guidance
- Nothing is stored
Find a California waste code
231, Pesticide rinse water.
Organics
Pesticide rinse water
Hazardous rinse water from pesticide use or handling.
ComplyOnSiteIs California code 231 hazardous waste?
Not from the code alone. The material must first be determined hazardous. California code 231 is not restricted, and a restricted code takes priority over it. A non-restricted code doesn't make a waste non-hazardous.
If the shipment needs the Uniform Hazardous Waste Manifest, enter 231 in Item 13 for the waste line. Use one California code, plus any federal RCRA codes when the waste is federally hazardous.
Waste is RCRA waste when it meets a federal listing or characteristic and no federal exclusion applies. Non-RCRA waste is hazardous under California rules only. California presumes hazardous waste is RCRA unless the generator shows it isn't, so keep that determination.
What does California code 231 cover?
This is for hazardous water produced by rinsing during pesticide use or handling. The liquid form and the rinsing set it apart from discarded pesticide product and pesticide production waste.
- Rule
- Appendix XII(b)
- Official wording
- 22 CCR division 4.5, chapter 11, Appendix XII(b)
Is pesticide rinse water California code 231?
| Code | When it fits |
|---|---|
| 231 | Rinsing during pesticide use or handling produced the hazardous water. |
| 232 | The waste is pesticide product or came from pesticide production, not rinsing. |
Both the liquid form and the activity that produced it count.
Which wastes take California code 231?
| Waste | When it’s 231 |
|---|---|
| Pesticide rinse water | Water rinsed pesticide equipment, containers or handling areas. |
Which codes sit beside California code 231?
| Code | What it is |
|---|---|
| 213 | Petroleum or hydrocarbon solvent |
| 214 | Other solvent mixture |
| 221 | Waste oil and mixed oil |
| 222 | Oil-water separator sludge |
| 223 | Other oily hazardous waste |
| 241 | Tank-bottom waste |
| 251 | Still bottoms with halogenated organics |
| 252 | Other still-bottom waste |
Sources
- 22 CCR Division 4.5 Chapter 11 Appendix XII, California Hazardous Waste Codes
- Defining Hazardous Waste, updated October 2025
- Title 22 section 66261.100 - RCRA Hazardous Waste
- 22 CCR section 66261.101, Non-RCRA Hazardous Waste
- Manifest Regulations FAQ: Box 13, Waste Codes
- 22 CCR section 66262.23, Use of the Manifest
- Hazardous Waste Manifest Instructions