NPDES vs. NJPDES: Why New Jersey Uses Its Own Name for Stormwater and Wastewater Permits, and Why That Means NJDEP Is the Agency You Deal With
If you've read anything about water permits, you've seen the term NPDES, the National Pollutant Discharge Elimination System. That's the federal Clean Water Act program that requires a permit before a business discharges pollutants, including polluted stormwater runoff, into lakes, rivers, and streams. Then you start digging into New Jersey's rules and run into NJPDES instead, and it's fair to wonder whether you need one permit, two permits, or whether somebody just added a letter. The short answer is that NJPDES is New Jersey's version of NPDES. EPA handed the federal program to New Jersey decades ago, the state runs it under its own name and its own law, and it adds a few things the federal program doesn't cover, most notably discharges to groundwater.
In this article, we'll explain how New Jersey took over the federal program, what NJPDES covers that NPDES doesn't, and what all of this means in practice for a facility manager in New Jersey. The biggest takeaway is simple: for stormwater and wastewater permits, the New Jersey Department of Environmental Protection (NJDEP) is who you apply to, report to, and get inspected by, not EPA. If you're trying to figure out where your facility fits, feel free to reach out to RMA and we'll talk it through with you.
Table of Contents
TL;DR
NJPDES is New Jersey's own version of the federal NPDES permit program. EPA approved New Jersey to run the program in 1982, so the state issues these permits under its own Water Pollution Control Act and its own rules, and it goes further than the federal program by also regulating discharges to groundwater. For a New Jersey business, that means NJDEP is the agency you apply to, report to, and get inspected by, and you follow New Jersey's permits rather than EPA's national ones.
Why Does New Jersey Run the NPDES Program as NJPDES?
The federal Clean Water Act of 1972 created NPDES and made EPA responsible for it. But Congress also built in a way for states to take over. If a state passes its own law and sets up a permit program that meets the federal minimums, EPA can authorize that state to issue the permits instead. Nearly every state has done this, and EPA still issues permits directly in only a small number of states and territories.
New Jersey was an early mover. The state Legislature passed the Water Pollution Control Act in 1977, in part so New Jersey could run the permit system the federal law calls for. EPA then approved the state's program on April 13, 1982, covering the main permit program, regulation of federal facilities, the industrial pretreatment program, and general permits all on the same day. Since then, NJDEP has issued these permits under the New Jersey Pollutant Discharge Elimination System, which is where the extra "J" comes from. The detailed rules live in N.J.A.C. 7:14A.
So NJPDES isn't a second layer on top of NPDES. It's the same basic program, run by the state, carrying the state's name. New Jersey isn't alone in renaming it, either. Our neighbors in New York run theirs as SPDES, and we've covered how that plays out in our post on whether a New York SPDES stormwater permit is the same as a SWPPP. If you're still getting the basics of the federal program down, our guide to everything you need to know about NPDES stormwater permits is a good starting point.
What Does NJPDES Cover That the Federal NPDES Program Doesn't?
States can be stricter than the federal program, and New Jersey is. The biggest difference is groundwater. Federal NPDES is aimed at discharges into surface waters. Discharges into groundwater generally fall outside it, with one narrow exception the Supreme Court recognized in 2020 for groundwater discharges that are the functional equivalent of discharging straight into a river or stream. New Jersey's law doesn't draw that line. The Water Pollution Control Act covers both the surface and ground waters of the state, so NJPDES has a Discharge to Surface Water (DSW) side and a Discharge to Groundwater (DGW) side.
In practice, DGW permits come up when something is intentionally sent into the ground rather than into a stream or storm sewer. Think of infiltration lagoons, certain subsurface disposal systems handling more than ordinary sanitary waste, or treated groundwater being put back into the ground during a cleanup. Many sites never need a DGW permit, but it's worth knowing the category exists, because a discharge that wouldn't need a federal permit at all can still need one in New Jersey.
Groundwater isn't the only difference. Here's how the two programs compare for a typical industrial facility:
| Topic |
Federal NPDES |
New Jersey NJPDES |
| Legal basis |
Clean Water Act |
New Jersey Water Pollution Control Act and N.J.A.C. 7:14A |
| Who issues permits |
EPA, or the authorized state |
NJDEP |
| Waters covered |
Surface waters, with a narrow groundwater exception |
Surface waters and groundwater |
| Industrial stormwater permits |
EPA's Multi-Sector General Permit, where EPA is the permitting authority |
The Basic Industrial Stormwater General Permit (5G2), industry-specific general permits, individual permits, or a no exposure exclusion |
| Penalties |
Clean Water Act civil and criminal penalties |
State penalties, including mandatory penalties for certain violations under the Clean Water Enforcement Act amendments |
The stormwater row is where most New Jersey businesses feel the difference. Instead of one national permit with industry sectors, New Jersey has a basic permit plus separate general permits for concrete products manufacturing, hot mix asphalt, mining and quarrying, sand and gravel, scrap metal, vehicle recycling, and wood waste recycling and leaf composting. Picking the right one matters, and our guide to NJPDES stormwater permit requirements for New Jersey facilities walks through how those categories work.
Do New Jersey Businesses Deal With EPA or NJDEP for NJPDES Permits?
For day-to-day permitting, you deal with NJDEP. That's who you send your Request for Authorization (RFA) to when you apply for a general permit, who reviews individual permit applications, who receives your reports, and who shows up for inspections. NJDEP also handles most enforcement when something goes wrong. If your facility is covered by the 5G2 permit, for example, everything from your authorization to your annual inspection and certification runs through the state, and we explain that permit in detail in our post on the 5G2 basic industrial stormwater permit in New Jersey.
EPA doesn't disappear, though. It oversees New Jersey's program to make sure it keeps meeting federal standards, and it keeps the ability to step in on enforcement in unusual cases. The Clean Water Act's citizen suit provisions also still apply. But you won't file EPA's federal forms or get coverage under EPA's Multi-Sector General Permit for a New Jersey industrial site. If a national guide or a vendor tells you to file a federal Notice of Intent with EPA for your New Jersey stormwater, that's a sign they're working from the wrong rulebook.
One more wrinkle: if your wastewater goes to a sewer instead of a stream, your local sewerage authority is usually your first point of contact. New Jersey's approved pretreatment program means many of those authorities set and enforce their own limits on what industrial users can send them, with NJDEP in the background.
Common NPDES and NJPDES Mix-Ups at New Jersey Facilities
The most common mistake we see is following federal guidance for a New Jersey permit. National articles, templates, and training are almost always written around EPA's Multi-Sector General Permit, and New Jersey's permits are structured differently. Sampling is a good example. Requirements vary by New Jersey permit category, and some New Jersey permits don't require stormwater sampling at all, so a checklist built for the federal permit can have you doing work you don't need while missing things your New Jersey permit does require. The same goes for which permit you're under in the first place, and our post on general, individual, and no exposure NPDES permits covers how those options differ.
Plan names trip people up too. Most of the country calls it a stormwater pollution prevention plan, or SWPPP. In New Jersey you'll also see it called an SPPP, an SP3, or just a stormwater plan. They're the same basic idea, but a SWPPP built from a federal template won't line up with what a New Jersey permit asks for unless it's written to that permit. If you're new to these plans, start with what a SWPPP is and how it works.
Finally, people sometimes assume NJPDES only means stormwater, or only means pipes into rivers. It covers process wastewater, discharges to sewer systems through pretreatment, and discharges into the ground. If water leaves your site in any form other than clean rain running off a clean roof, it's worth confirming how NJPDES applies.
How RMA Helps New Jersey Facilities With NJPDES Permits
We're a New Jersey company, and we've been working with NJDEP and its permit programs since 1992. We help facilities figure out which NJPDES permit fits their operation, or whether they qualify for a no exposure exclusion and don't need one at all. From there, we can prepare the RFA, write a SWPPP built for your specific New Jersey permit, train your team, and support you through inspections, annual certifications, and sampling where your permit requires it. If you're expanding or building, we don't handle construction-phase permits, but we can help you sort out what your facility will need once it's running and point you toward the right people for the construction side.
If NPDES versus NJPDES is still leaving you unsure about what applies to your site, we're happy to talk it through with no pressure and no obligation. You can call us, send an email, or fill out the form on our website, and if it turns out you don't need us, we'll tell you that too. When you're ready, contact RMA and one of our team members will get back to you.
