What is the fine-grained topic of the following text: Under the auspices of the U.S. Environmental Protection Agency, the State Board and nine Regional Boards also have the responsibility of granting Clean Water Act National Pollutant Discharge Elimination System permits, commonly known as NPDES permits, for certain point-source discharges. Only return the topic.
Granting of NPDES permits by the U.S. Environmental Protection Agency and Regional Boards