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The National Pollutant Discharge Elimination System (NPDES) is a permit program that was established in 1972 by the Clean Water Act (CWA) to reduce water pollution in the United States. The NPDES program controls pollution by regulating point sources that discharge pollutants into waters of the United States. An NPDES permit acts as a license for a facility to discharge a specified amount of a pollutant into a water source under certain conditions. The two basic types of NPDES permits are individual and general permits. General permits cover a group of facilities with similar qualities within a given geographical location, while individual permits are tailored to a single facility. The EPA administers, enforces, and oversees the NPDES permit program for all governments, with 47 states and one territory currently required to implement it.
| Characteristics | Values |
|---|---|
| Purpose | To control the discharge of pollutants into surface waters |
| Control methods | Water quality-based limits and technology-based limits |
| Pollutants | Rock, sand, dirt, and agricultural, industrial, and municipal waste |
| Permits | Individual and general |
| Individual permits | Tailored to a single facility, based on an application |
| General permits | Cover a group of facilities with similar qualities within a specific region |
| Application process for individual permits | Operators must submit a permit application to the permitting authority at least 180 days before the expected commencement of discharge |
| Application process for general permits | Operators submit a Notice of Intent (NOI) after the general permit is issued |
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Individual permits
The National Pollutant Discharge Elimination System (NPDES) was created in 1972 by the Clean Water Act (CWA) to address water pollution by regulating point sources that discharge pollutants into the waters of the United States. Any time a municipality, industry, or other entity wishes to discharge pollutants into the surface water of the United States, they must first obtain an NPDES permit.
An NPDES individual permit is written to reflect the site-specific conditions of a single discharger (or, in rare instances, multiple co-permittees) based on the information submitted by the discharger in a permit application. Individual permits are issued directly to an individual discharger and are unique to that discharger. The application form must be submitted to the permitting authority at least 180 days before the expected commencement of the discharge. Ecology will inform permit applicants in writing whether their application is complete within 60 days of receipt. If the application is deemed incomplete, Ecology will itemize what is needed to make the application complete. The application is submitted to the appropriate Ecology Regional Office. Ecology typically issues individual permits for five years, which is the maximum duration. There are both application fees and annual coverage fees for this permit. The one-time application fee for new facilities must be submitted with the application of 25% of the annual permit fee or $250, whichever is greater.
The permit will require the facility to sample its discharges and notify the Environmental Protection Agency (EPA) and the state regulatory agency of these results. In addition, the permit will require the facility to notify the EPA and the state regulatory agency when the facility determines it is not in compliance with the requirements of a permit. EPA and state regulatory agencies also will send inspectors to companies to determine if they are in compliance with the conditions imposed under their permits.
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General permits
The National Pollutant Discharge Elimination System (NPDES) was created in 1972 by the Clean Water Act (CWA) to address water pollution by regulating point sources that discharge pollutants into the waters of the United States. The two basic types of NPDES permits issued are individual and general permits.
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Point sources
Point source water pollution refers to pollution that comes from "any discernible, confined, and discrete conveyance from which pollutants are or may be discharged." In other words, it is pollution that comes from a single, identifiable source, such as a pipe or a drain, that discharges pollutants directly into a water body. This is in contrast to nonpoint source pollution, which does not come from a single, identifiable source and is often the result of runoff or atmospheric deposition.
In the United States, point source water pollution is primarily regulated through the Clean Water Act (CWA), which was enacted in 1972. The CWA defines a pollutant as any type of industrial, municipal, or agricultural waste discharged into water, including dredged soil, solid waste, sewage, garbage, chemical wastes, biological materials, radioactive materials, and more. The Act requires that any entity discharging pollutants into a water body must obtain a National Pollutant Discharge Elimination System (NPDES) permit.
The NPDES permit program is administered by the Environmental Protection Agency (EPA) and sets limits on the amount of pollutants that can be discharged into a water body. There are two types of NPDES permits: individual and general. An individual permit is tailored to a specific facility, based on information submitted by that facility in a permit application. A general permit, on the other hand, covers multiple dischargers with similar operations and types of discharges within a given geographical location.
The NPDES permit program provides two levels of control: technology-based limits and water quality-based limits. Technology-based effluent limits establish a minimum level of pollution controls for all point source discharges. If these limits are not sufficient to protect a particular water body, then water quality-based effluent limits are developed for facilities discharging into that water body.
In addition to the federal NPDES program, individual states are also authorized by the EPA to issue permits when they have demonstrated that their program is at least as stringent as the federal program. This allows states to have more control over the day-to-day issuance of permits and oversight of the program, while the EPA provides review and guidance. As of 2025, 47 states and one territory are authorized to implement the NPDES program.
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Effluent limitations
The National Pollutant Discharge Elimination System (NPDES) is a permit programme established in 1972 by the Clean Water Act (CWA). It regulates point sources of pollution discharge in the US, aiming to reduce water pollution and protect water sources. The two types of NPDES permits are general and individual permits. General permits are issued to a group of facilities with similar characteristics within a specific region, while individual permits are issued to a single facility based on its application.
The NPDES permit program controls water pollution by regulating point sources that discharge pollutants into US waters. Point sources include pipes, ditches, and other discrete conveyances. Pollutants covered by NPDES include rock, sand, dirt, and various types of waste. The program sets effluent limits that must be consistent with the assumptions used to derive wasteload allocations. These limits are crucial in controlling pollution and protecting water quality.
The process of determining effluent limitations involves a comprehensive analysis of the proposed discharge. NPDES permit writers must consider factors such as the type and amount of pollutants, the location of the discharge, and the potential impact on the receiving water. This analysis can be conducted for each individual discharge or for an entire watershed. The resulting effluent limitations are then included in the NPDES permits, outlining the conditions under which facilities are allowed to discharge pollutants.
The public plays a vital role in the NPDES permit process. Members of the public can review draft permits, prepare statements, and participate in public hearings. They can provide comments on proposed general permits and even appeal issued permits if they have concerns. This involvement ensures transparency and allows local communities to have a say in decisions that may affect their water sources.
In conclusion, effluent limitations are a fundamental aspect of the NPDES permit program, ensuring that the discharge of pollutants into water sources is carefully regulated. By setting specific limitations, the NPDES program strives to protect water quality, safeguard public health, and preserve the environment. The collaboration between permitting authorities, facility operators, and the public is crucial in achieving these goals and maintaining the integrity of water resources.
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Enforcement
The National Pollutant Discharge Elimination System (NPDES) is a permit programme that was established in 1972 by the Clean Water Act (CWA). The NPDES permit programme controls water pollution by regulating point sources that discharge pollutants into bodies of water.
The US Environmental Protection Agency (EPA) administers, enforces, and oversees the NPDES permit programme for all governments. The EPA's NPDES programme aims to regulate pollution in the US, with the goal of preserving and protecting the nation's water sources. The EPA has various methods to take enforcement actions against violators of permit requirements. For example, the EPA may issue administrative orders requiring facilities to correct violations and may assess monetary penalties. The EPA can also pursue civil and criminal actions, including mandatory injunctions, penalties, and jail sentences for persons found willfully violating requirements and endangering the health and welfare of the public or the environment.
The general public can also enforce permit conditions. The facility monitoring reports are public documents, and any member of the public can review them. If a member of the public finds that a facility is violating its NPDES permit, they can independently start a legal action, unless the EPA or the state regulatory agency has already taken enforcement action.
In California, the State Water Board and the nine Regional Water Quality Control Boards (Regional Water Boards) ensure compliance with NPDES permits through compliance inspections, monitoring report reviews, and enforcement actions if necessary. Each Regional Water Board makes critical water quality decisions for its region.
In Illinois, the Illinois EPA is delegated the NPDES programme from the USEPA and receives federal funding to administer permitting, compliance, monitoring, and enforcement activities. The compliance assurance/enforcement process is typically initiated in three ways:
- Field inspection, either routine or complaint-driven
- Anomalous result, effluent violation on a discharge monitoring report (DMR), or failure to submit a DMR
- Unplanned pollution event
On-site inspections are completed by the FOS inspectors in the seven FOS regions, who visit sites based on a complaint or a routine inspection. The FOS inspector generates a report. If areas of non-compliance with the regulations are noted, the FOS inspector may issue a Non-Compliance Advisory (NCA) for matters that do not have a significant environmental impact. If the violations are significant or if the facility fails to respond to an NCA, the FOS inspector generates a request for a Violation Notice (VN).
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Frequently asked questions
The NPDES program was designed to reduce water pollution in the United States. It was established in 1972 by the Clean Water Act (CWA) and controls pollution in two ways: with water quality-based limits and technology-based limits.
Pollutants under NPDES include, but are not limited to, rock, sand, dirt, and agricultural, industrial, and municipal waste discharged into the waters of the United States.
There are two basic types of NPDES permits: individual and general. An individual permit is tailored to a single facility, whereas a general permit covers a group of facilities with similar qualities within a given geographical location.
An operator must submit a permit application to apply for coverage under an NPDES individual permit. The application form must be submitted at least 180 days before the expected commencement of the discharge. To apply for coverage under an NPDES general permit, a Notice of Intent (NOI) must be submitted.
