| drag reducer | EC50 (mg·L−1) | Toxicity level |
| Oil-based drag reducer | 1129 | Slight poison |
| Powder drag reducer | 63.27 | Moderate poison |
| Water | 1.0 × 106 | nonpoisonous |
| CQFR drag reducer | 1.89 × 106 | nonpoisonous |
| CQFR drag reducer system | 1.86 × 106 | nonpoisonous |