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  1. epa.gov
    https://echo.epa.gov › files › echodownloads › NPDES_by_state_year

    Index of /files/echodownloads/NPDES_by_state_year

    Apache/2.4.37 (Red Hat Enterprise Linux) Server at echo.epa.gov Port 443

  2. epa.gov
    https://echo.epa.gov › files › echodownloads › NPDES_by_state_year

    Index of /files/echodownloads/NPDES_by_state_year

    Index of /files/echodownloads/NPDES_by_state_yearIndex of /files/echodownloads/NPDES_by_state_year

  3. epa.gov
    https://echo.epa.gov › files › echodownloads · Web view
    [DOC]

    Contents

    - A single digit value indicating that the facility is discharging into a water that has been identified as impaired (category 4 or category 5) in the Watershed Assessment, Tracking & Environmental …