美国环保署根据毒性数据，采用五级或三级毒性分类标准对农药进行分类，分别针对陆生和水生生物，将其生态毒性按以下标准归入不同类别：
1 陆生-鸟类：5级分类
|
toxicity category |
avian: acute oral concentration (mg/kg-bw) |
avian: dietary concentration (mg/kg-diet) |
|
very highly toxic |
＜10 |
＜50 |
|
highly toxic |
10～50 |
50～500 |
|
moderately toxic |
51～500 |
501～1000 |
|
slightly toxic |
501～2,000 |
1,001～5,000 |
|
practically nontoxic |
＞2,000 |
＞5,000 |
2 陆生-野生哺乳类：5级分类
|
toxicity category |
wild mammals: acute oral concentration(mg/kg bw) |
|
very highly toxic |
＜10 |
|
highly toxic |
10～50 |
|
moderately toxic |
51～500 |
|
slightly toxic |
501～2000 |
|
practically nontoxic |
＞2,000 |
3 陆生-非靶标昆虫：3级分类
|
toxicity category |
non-target insects: acute concentration(µg/bee) |
|
very highly toxic |
|
|
highly toxic |
＜2 |
|
moderately toxic |
2～11 |
|
slightly toxic |
|
|
practically nontoxic |
＞11 |
4 水生：5级分类
|
toxicity category |
aquatic organisms: acute concentration(mg/l) |
|
very highly toxic |
＜0.1 |
|
highly toxic |
0.1～1 |
|
moderately toxic |
＞1～10 |
|
slightly toxic |
＞10～100 |
|
practically nontoxic |
＞100 |
（资料来源：https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/technical-overview-ecological-risk-assessment-0）
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