Vessel Incidental Discharge Act: Standards, Vessels, and Penalties

The Vessel Incidental Discharge Act (VIDA), enacted in 2018 as part of the Frank LoBiondo Coast Guard Authorization Act, rewrites how commercial ships manage routine water pollution in U.S. waters by replacing the EPA’s permit-based system with national technology-based performance standards enforced by the Coast Guard.¹ The most important practical fact for operators in 2026: the new framework is not yet fully in force. The 2013 Vessel General Permit still governs day-to-day compliance until the Coast Guard finalizes its implementing regulations, which has not happened.

What Rules You Follow Today

VIDA requires two sets of rules to work together. The EPA sets the environmental performance standards, and the Coast Guard writes the equipment, operating, and enforcement regulations that make those standards enforceable at sea.

The EPA published its final standards of performance in October 2024, but those standards do not actually take effect until the Coast Guard publishes its companion regulations.² Until both sets of rules are final, effective, and enforceable, the 2013 Vessel General Permit’s discharge limits, monitoring requirements, and reporting obligations remain in force.³ Once the Coast Guard’s rules become enforceable, the 2013 VGP and the existing ballast water regulations under the Nonindigenous Aquatic Nuisance Prevention and Control Act will be repealed automatically.

Operators who assume VIDA has already “replaced” the old system and stop following the VGP are exposing themselves to enforcement action. Compliance today means the VGP. Compliance tomorrow will mean VIDA. Preparation for the second doesn’t excuse the first.

Which Vessels Are Covered

VIDA primarily covers non-recreational, non-military commercial vessels that are 79 feet or longer and operate in U.S. waters or the contiguous zone. Cargo ships, tankers, research vessels, and similar working craft fall into this category, and every type of incidental discharge from these vessels is regulated.²

Smaller commercial vessels under 79 feet, and fishing vessels of any size, carry a narrower obligation: only their ballast water discharges are regulated. For all other incidental discharges, these vessels are permanently exempt, and VIDA explicitly bars both the EPA and state governments from requiring discharge permits for those non-ballast discharges.⁴

Three categories sit outside VIDA entirely:

Armed Forces vessels, which operate under a separate framework where the EPA and the Secretary of Defense jointly set discharge standards.⁵
Recreational vessels, governed by different environmental requirements.
Permanently moored floating craft, which are not treated as operating vessels.

Which Discharges Are Regulated

An incidental discharge is any release of water or fluid that results from a vessel’s normal operations, as opposed to an accidental spill or mechanical failure. The EPA’s final rule under 40 CFR Part 139 regulates roughly 20 distinct discharge categories, covering far more than just ballast water.⁶ The regulated streams include:

Ballast water, the highest-profile stream because of its role in moving invasive species between ecosystems.
Bilgewater, which collects in a ship’s bilge and often contains oil and cleaning agents.
Graywater from galley sinks, showers, and laundry systems.
Deck runoff, meaning rainwater and washdown water flowing across weather decks.
Exhaust gas scrubber washwater from emission control systems.
Cooling water circulated through engines and equipment.
Oil water separator effluent from bilge or machinery spaces.
Hull coating and cleaning residue, including anti-fouling paint runoff.
Chain locker effluent, cathodic protection discharges, boiler blowdown, and fire protection system water.

The rule does not cover garbage thrown overboard, air emissions from propulsion systems, or discharges from activities beyond normal vessel operation.

The Performance Standards That Matter Most

The EPA’s standards are technology-based: the agency evaluates the best treatment technology that is economically achievable and sets numeric limits based on what that technology can accomplish.⁵ A few standards drive most of the compliance work.

Ballast Water Organism Limits

Discharged ballast water must stay under strict organism concentrations:²

Large organisms (50 micrometers or larger): fewer than 10 living organisms per cubic meter.
Small organisms (10 to 50 micrometers): fewer than 10 living organisms per milliliter.
Toxicogenic Vibrio cholerae (serotypes O1 and O139): fewer than 1 colony-forming unit per 100 mL.
E. coli: fewer than 250 colony-forming units per 100 mL.
Intestinal enterococci: fewer than 100 colony-forming units per 100 mL.

Meeting these limits requires a Coast Guard type-approved ballast water management system, which is the single largest equipment investment most vessels face under VIDA. A type-approved system manufactured within the dates listed on its certificate remains compliant for its entire service life, as long as it is operated and maintained according to its approved manual.⁷

Scrubber Washwater Limits

Vessels using exhaust gas cleaning systems must meet pH and nutrient limits at the overboard discharge point. The washwater’s pH must be at least 6.5, with no more than a two-unit difference between the intake seawater and the discharge during transit. A brief exceedance of up to 15 minutes within any 12-hour period is permitted.²

Nitrate and nitrite concentrations are capped at levels that scale with the washwater flow rate. At the standard reference rate of 45 tons per megawatt-hour, the limit is 60 mg/L. Lower flow rates carry proportionally higher concentration limits, topping out at 2,700 mg/L for systems operating below 1 ton per megawatt-hour.

Environmentally Acceptable Lubricants

Any equipment with an oil-to-sea interface (a point where lubricant can escape directly into surrounding water) must use an environmentally acceptable lubricant (EAL) unless doing so is technically infeasible. Stern tubes, rudder bearings, thrusters, and other submerged components are the common examples. An EAL must be biodegradable, minimally toxic, and not bioaccumulative.⁶ The EPA does not endorse specific certifications, but most products certified under major eco-labeling schemes are expected to meet the criteria. For new builds, the agency encourages seawater-based stern tube lubrication systems that eliminate oil discharge from these interfaces altogether.

Hull Cleaning and Biofouling

Removing macrofouling (visible growth like barnacles and mussels) in the water is prohibited unless the cleaning uses a capture system that collects all debris and transports it to a barge or shore facility for disposal. Light cleaning of microfouling (slime and biofilm) can be done without capture, but only if the work minimizes coating damage, follows the coating manufacturer’s instructions, and complies with any applicable pesticide labeling requirements.²

Copper-based hull coatings face additional restrictions. In any water body already impaired by copper contamination, cleaning a copper-based coating without capture is prohibited for the first 365 days after application. Hull cleaning of any kind is banned in federally protected waters, with a narrow exception for government vessels that operate exclusively within those waters. Any cleaning agents used on hull surfaces must be phosphate-free, minimally toxic, and biodegradable.

Great Lakes Add-Ons

Vessels operating in the Great Lakes face additional obligations because the region has been treated as ecologically sensitive and vulnerable to invasive species introductions.²

Any vessel entering the St. Lawrence Seaway through the mouth of the St. Lawrence River must perform a complete ballast water exchange or saltwater flush before arriving. For voyages originating outside the Exclusive Economic Zone, the exchange must happen at least 200 nautical miles from shore. For voyages originating within the EEZ, the minimum distance is 50 nautical miles. Safety exceptions exist: if compliance would endanger the vessel, if the vessel has no residual ballast or sediment, or if the vessel keeps all ballast sealed while in the Great Lakes, the exchange requirement is waived.

Existing Lakers (vessels operating exclusively within the Great Lakes) are exempt from the numeric ballast water discharge standard. Great Lakes states can also petition for enhanced regional standards through a multi-governor endorsement process coordinated by the Great Lakes Commission.⁵

State Rules and Federal Preemption

VIDA’s preemption provision is one of its most consequential features for operators moving between ports. Once the Coast Guard’s implementing regulations become final, effective, and enforceable, states are generally barred from adopting or enforcing their own discharge laws for vessels covered by VIDA. Before the law, states like New York and California sometimes imposed requirements stricter than the federal VGP, creating friction for ships transiting multiple jurisdictions.⁵

The preemption has exceptions. States may continue enforcing any law that is identical to the federal standard, or where compliance with the state law would be achieved simultaneously with compliance with the federal standard. States can also enforce the federal VIDA standards themselves under existing Clean Water Act authority. Governors retain a right to petition the EPA for more stringent standards in their state’s waters, or to apply for no-discharge zone designations covering specific waters.

The catch: preemption hasn’t taken effect. Because the Coast Guard’s regulations remain pending, states retain their existing authority over vessel discharges. Operators cannot rely on VIDA preemption as a defense against state enforcement actions in 2026.

Recordkeeping and Penalties

Under the current 2013 VGP framework, vessel operators must maintain detailed discharge logs recording the date, time, geographic coordinates, volume, and treatment method for every regulated discharge in U.S. waters. These records must be kept for at least three years. Operators must submit Notices of Intent, annual reports, and Notices of Termination through the EPA’s 2013 VGP eNOI System, accessed through the EPA’s Central Data Exchange. Certifying officials without an existing account need to register through the CDX interface before they can file.⁸

These reporting obligations remain in place until the Coast Guard’s regulations take effect. What VIDA recordkeeping will look like in detail depends on the Coast Guard’s final rule, though operators should expect at minimum the same categories of data, plus possible equipment-specific maintenance and calibration records for ballast water management systems and other treatment hardware.

Once the Coast Guard’s enforcement regulations take effect, discharge violations will carry significant civil penalties. Under the Clean Water Act’s 2025 inflation-adjusted penalty schedule (which remains in effect for 2026 because no new adjustment was published), the maximum civil penalty under Section 309(d) is $68,445 per violation per day.⁹¹⁰ Inspectors can board vessels, examine physical equipment, review documentation, and verify that installed systems match their type approval specifications. Failing to produce required documentation during an inspection can result in penalties and operational delays independent of whether the underlying discharges actually met the performance standards. The records are the proof.

1
GovInfo. Frank LoBiondo Coast Guard Authorization Act of 2018
2
Federal Register. Vessel Incidental Discharge National Standards of Performance
3
U.S. Environmental Protection Agency. 2013 Vessel General Permit and Interim Requirements
4
U.S. Environmental Protection Agency. The Vessel Incidental Discharge Act (VIDA)
5
Office of the Law Revision Counsel. 33 USC 1322 – Marine Sanitation Devices; Discharges Incidental to the Normal Operation of Vessels
6
eCFR. 40 CFR Part 139 – Discharges Incidental to the Normal Operation of Vessels
7
United States Coast Guard. BWMS Type Approval Certificates
8
Environmental Protection Agency. Commercial Vessel Discharge Standards: Frequently Asked Questions
9
GovInfo. Civil Monetary Penalty Inflation Adjustment Rule
10
The White House. Cancellation of Penalty Inflation Adjustments for 2026