Versions of 40 CFR 451.21 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) on LawServer 2024 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2023 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2022 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2021 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2020 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2019 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2016 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2015 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2014 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT) 2009 40 CFR 451.21 – Effluent limitations attainable by the application of the best practicable control technology currently available (BPT)