Discharge Permits: Who Needs One and What It Limits

The rule is a prohibition, not a license scheme. No person may discharge a pollutant from a point source into waters of the United States unless the discharge complies with a permit. That sentence sits in section 301 of the Clean Water Act at 33 U.S.C. 1311, and the permit program that supplies the only workable defense to it sits in section 402 at 33 U.S.C. 1342. A facility without a permit is not unregulated. It is in violation on every day it discharges.

The four elements that trigger coverage

Coverage turns on four things happening together: an addition, of a pollutant, to waters of the United States, from a point source. Remove any one and the permit requirement falls away. A point source is defined at 33 U.S.C. 1362(14) as a discernible, confined and discrete conveyance — a pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container or concentrated animal feeding operation.

Two exclusions are written into that definition and both matter in practice. Agricultural stormwater discharges are outside it, and return flows from irrigated agriculture are outside it. The first keeps rain moving off a field distinct from a pipe carrying the same nutrients; the second leaves irrigation delivery and drainage to state water administration. Whether a particular flow is genuinely irrigation return flow is a recurring fight, and it interacts with how the underlying right is measured under the beneficial use and duty of water standards.

Technology limits first, water quality limits second

A permit writer builds limits in two passes. The first pass applies technology-based effluent limitations, which are set nationally by industrial category in the effluent limitations guidelines and applied without reference to the condition of the receiving water. Existing sources face best practicable control technology, best conventional pollutant control technology for conventional pollutants, and best available technology economically achievable for toxic and nonconventional pollutants. New sources face new source performance standards, which are stricter and are generally locked in for a protected period.

The second pass asks whether those limits are enough for the water actually receiving the discharge. If a technology-based limit would still allow a state water quality standard to be exceeded, the permit must carry a water quality-based limit calculated from a wasteload allocation. Where a segment is impaired and a total maximum daily load has been established, the discharger's allocation under that load becomes the ceiling.

Choosing between an individual and a general permit

Two routes exist. An individual permit is written for one facility, with limits derived from that facility's outfalls and receiving water. A general permit covers a category of similar dischargers on standard terms, and coverage is obtained by filing a notice of intent rather than a full application. The general route is faster and cheaper; the individual route allows argument about the numbers.

Most states are authorized to run the program themselves, so the application goes to the state agency and the state's rules on fees, forms and appeal deadlines control. The federal floor still applies.

Sampling, records and the reports that follow

The permit specifies what to sample, where, how often and by what analytical method. Results go onto discharge monitoring reports filed on the schedule the permit sets, and those reports are self-reported evidence. They are the ordinary basis for an enforcement case.

Records of monitoring — the original strip charts, calibration and maintenance records, and the analytical results — must be retained for at least three years, and that period extends when an enforcement matter is open. Noncompliance that may endanger health or the environment triggers an oral report within twenty-four hours of the time the permittee becomes aware of it, followed by a written submission within five days unless the reporting authority waives it.

Renewal, transfer and what happens at expiration

A permit term may not exceed five years. A renewal application is due at least one hundred eighty days before expiration, and a facility proposing a new discharge must apply at least one hundred eighty days before the discharge begins. A missed renewal turns a compliant facility into an unpermitted discharger by operation of the calendar.

Anti-backsliding restricts the reissued permit from relaxing an existing limit, subject to defined exceptions. Transfers require notice to the permitting authority and, in most cases, a modification naming the new owner; a purchaser who assumes operations without completing that step inherits the discharge but not the authorization. Buyers should treat the permit file as part of diligence, alongside the record review described in the pre-purchase inquiry standard.

What noncompliance costs

Enforcement runs on three tracks: administrative penalty orders for smaller matters, civil judicial actions seeking injunctive relief and per-day penalties, and criminal liability for negligent and knowing violations.

Private enforcement is a separate risk. Any citizen may sue for ongoing violations after serving the required notice, and a monitoring report showing a pattern of exceedances is a nearly complete case; the mechanics are set out in the notice period and diligent prosecution bar. Separately, a spill or unpermitted release from a permitted facility can trigger reporting obligations that have nothing to do with the permit, on the clocks described in the release notification rules. A facility that discovers a violation before the agency does has one more option worth weighing, which is the disclosure route in the audit policy and the penalty reduction it offers.