2024 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2023 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2022 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2021 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2020 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2019 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2016 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2015 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2014 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2010 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems

2009 40 CFR 749.68 – Hexavalent chromium-based water treatment chemicals in cooling systems