• Clean Harbors average gross margin for 2023 was 31%, a 0.16% increase from 2022.
• Clean Harbors average gross margin for 2022 was 31.05%, a 3.21% decline from 2021.
• Clean Harbors average gross margin for 2021 was 32.08%, a 2.95% decline from 2020.

Gross margin can be defined as a company's total sales revenue minus its cost of goods sold, divided by the total sales revenue, expressed as a percentage.