California Water Boards' Annual Performance Report - Fiscal Year 2017-18
REGULATE: NPDES WASTEWATER FACILITIES
GROUP:
NPDES WASTEWATER FACILITIES
MESSAGE:
MEASURE: NPDES FACILITIES BY TYPE
MEASUREMENTS - Data Last Updated on:
Regional
Offices |
Major Facilities |
Minor Facilities |
Total |
Individual
Permits |
Individual
Permits |
General Permit
Enrollees |
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WHAT THE MEASURE IS SHOWING
WHY THIS MEASURE IS IMPORTANT
TECHNICAL CONSIDERATIONS
GLOSSARY
Major Facility
Major municipal dischargers include all facilities with design flows of greater than one million gallons per day and facilities with approved industrial pretreatment programs. Major industrial facilities are determined based on specific ratings criteria developed by US EPA/State.
Minor Facility
A minor facility is a discharge with a design flow of less than one million gallons per day (MGD) that has not been determined to have an actual or potential adverse environmental impact classifying the discharge as major.
General Facility
A general facility is a discharge with a design flow of less than one million gallons per day (MGD) that has not been determined to have an actual or potential adverse environmental impact classifying the discharge as major.
National Pollutant Discharge Elimination System (NPDES)
The NPDES permit program (Section 402 of the Clean Water Act) controls water pollution by regulating point sources that discharge pollutants into waters of the United States. Point sources are discrete conveyances such as pipes or man-made ditches. Individual homes that are connected to a municipal system, use a septic system, or do not have a surface discharge do not need an NPDES permit; however, industrial, municipal, and other facilities must obtain permits if their discharges go directly to surface waters. US EPA has approved the Water Board's program to issue NPDES permits.
NPDES Permit
The Clean Water Act prohibits anybody from discharging "pollutants" through a "point source" into a "water of the United States" unless they have an NPDES permit. The permit contains limits on what can be discharged, monitoring and reporting requirements, and other provisions to protect water quality and public health. In essence, the permit translates general requirements of the Clean Water Act into specific provisions tailored to the operations of each person discharging pollutants.
