A Plain-English Guide to Pennsylvania's Industrial Stormwater General Permit: Who Needs It, What It Requires, and How It Compares to No Exposure and Individual Permits
If you run an industrial facility in Pennsylvania, sooner or later someone will mention PAG-03. It might be a DEP inspector, an insurer, a buyer's environmental consultant, or a competitor who just went through it. The name doesn't explain much, and the permit itself is a long document written for regulators, so it's easy to come away knowing you might need "PAG-03" without knowing what it is or what it would mean for your operation. This article is meant to fix that in plain language.
The short answer is that PAG-03 is Pennsylvania's general NPDES permit for stormwater discharges associated with industrial activity. "General" means DEP wrote one permit that covers many similar facilities, and each facility applies for coverage under it by filing a Notice of Intent instead of getting a custom permit written just for them. It applies to facilities in covered industrial categories whose industrial activity is exposed to rain or snow, and it requires a written PPC Plan, routine site inspections, stormwater sampling compared against benchmarks for your sector, electronic reporting, an annual report, and employee training. Facilities with nothing exposed may qualify for a No Exposure Certification instead, and facilities that don't fit the general permit need an individual permit. Below, we walk through each piece. If you'd like to talk through your own facility, you can reach out to RMA.
Table of Contents
TL;DR
PAG-03 is Pennsylvania's one-size-fits-many permit for rain and snowmelt running off industrial sites. Instead of writing a custom permit for every facility, the state wrote one permit, and businesses sign up for it by filing a Notice of Intent. It applies to businesses in covered industries whose industrial work or materials are exposed to the weather, and it requires a written prevention plan, routine site inspections, stormwater sampling compared against set levels for your industry, online reporting, an annual report, and employee training. If nothing industrial is exposed, a simpler No Exposure Certification may work instead, and sites that don't fit the general permit need an individual permit.
What Is PAG-03, Pennsylvania's Industrial Stormwater Permit?
PAG-03 is the permit Pennsylvania uses to regulate stormwater running off industrial sites. Its full title is the NPDES General Permit for Discharges of Stormwater Associated with Industrial Activity. NPDES stands for National Pollutant Discharge Elimination System, the federal Clean Water Act program that requires a permit to discharge pollutants to rivers, streams, and other waters. The U.S. EPA delegates that program to Pennsylvania, so DEP issues and enforces the permits here, under both federal law and the state's Clean Streams Law. Pennsylvania's NPDES rules are in 25 Pa. Code Chapter 92a.
The idea behind PAG-03 is simple. When rain or snowmelt falls on an industrial site, it can pick up whatever's out in the weather: metals, oil and grease, sediment, high-pH concrete washout, nutrients, and more. That runoff flows to ditches, storm sewers, and eventually streams. PAG-03 doesn't ban that runoff. It sets conditions that facilities have to follow to keep pollutants out of it, and it requires them to check and report how well that's working. If the term "industrial stormwater" is new to you, our article on stormwater associated with industrial activity covers the basics, and our guide to everything you need to know about NPDES stormwater permits gives the national picture.
What Does a General Permit Mean, and How Does the PAG-03 Notice of Intent Work?
There are two basic kinds of NPDES permits. An individual permit is written for one specific facility, with conditions tailored to its operations and the stream it discharges to. A general permit is written once to cover a whole class of similar dischargers. PAG-03 is a general permit. DEP drafts it, takes public comment, publishes it in the Pennsylvania Bulletin, and then any eligible facility can obtain coverage under it rather than going through a full custom permitting process.
You get coverage by filing a Notice of Intent, or NOI. The NOI tells DEP who you are, what you do, which sector appendix applies to you, where your stormwater leaves the site, and where it goes. Under the current permit, the NOI has to list every outfall at the facility, not just the ones from industrial areas, and include a site map showing buildings, paved areas, control measures, drainage, receiving waters, and monitoring points. DEP reviews the package and, if everything checks out, approves your coverage. From that point on, your facility is bound by the conditions in the general permit plus whatever applies to your sector. If your facility changes in a way that affects stormwater, like new outfalls or new outdoor activities, you generally need to amend your coverage. Our article on how long it takes to get PAG-03 coverage covers the timeline from start to approval.
The trade-off is straightforward. A general permit is faster and cheaper to get than an individual one, but you don't get to negotiate its terms. You accept the conditions DEP wrote for everyone in your category. For most industrial facilities, that's a good deal.
Who Needs PAG-03 Coverage in Pennsylvania?
Three questions decide whether PAG-03 applies. The first is what your business does. The federal stormwater rules, which Pennsylvania follows, list the industrial categories that need coverage, mostly by SIC code, plus a few defined by description, like hazardous waste facilities and landfills that took industrial waste. Manufacturers, concrete and asphalt plants, scrap and recycling yards, food processors, chemical plants, trucking terminals with maintenance areas, and many others fall in. Our article on who needs a stormwater permit walks through those categories.
The second question is whether any industrial materials or activities are exposed to rain, snow, or runoff. If everything is indoors or under a storm-resistant shelter, you may qualify for a No Exposure Certification instead. The third question is where your stormwater goes. PAG-03 covers discharges that reach waters of the Commonwealth, including through a municipal storm sewer. Facilities discharging to High Quality or Exceptional Value waters, or whose stormwater has a wasteload allocation in a TMDL, aren't eligible for the general permit and generally need an individual permit. In some older cities with combined sewers, runoff that goes to a treatment plant may fall under the sewer authority instead, so local rules are worth confirming.
Plenty of businesses usually don't need PAG-03 at all. Warehouses, body shops, dealerships, quick-lubes, and most contractors probably fall outside the covered categories. Trucking, bus, rail, and airport operations are generally covered only for their maintenance, equipment cleaning, fueling-related, or deicing areas. Quarries are handled under DEP's mining program rather than PAG-03. If you're not sure where you fit, the answer starts with your primary SIC code.
What Does PAG-03 Require in Practice?
Getting coverage is the start, not the finish. Once you're covered, PAG-03 asks for a set of ongoing tasks. The table below summarizes them. Specific frequencies, deadlines, and values can change from one edition of the permit to the next, so treat the timing column as a guide and confirm each item against the current PAG-03 and your sector appendix.
| Requirement |
What It Means in Practice |
Timing to Confirm in the Current Permit |
| PPC Plan |
A written plan describing your site, pollutant sources, controls, spill response, and responsibilities |
In place with coverage, then kept current as the site changes |
| Best management practices |
General and sector-specific controls, like good housekeeping, covered storage, spill kits, and containment |
Maintained continuously |
| Routine site inspections |
Walking the site to check controls, look for leaks and spills, and document what you find |
On the schedule set in the permit |
| Stormwater sampling |
Collecting samples at representative outfalls during storms and having them analyzed for your sector's parameters |
Semiannual under recent editions |
| Benchmark comparison |
Comparing results to benchmark values and taking corrective action on repeated exceedances |
After each monitoring period |
| eDMR reporting |
Entering sampling results in DEP's electronic Discharge Monitoring Report system |
After each monitoring period, by the permit's due dates |
| Annual report and fee |
Summarizing the year's compliance activity and paying the annual installment of the coverage fee |
Once a year |
| Employee training |
Making sure the people who handle materials, inspections, and spills know what the plan requires |
On the schedule set in the permit |
The PPC Plan is the backbone. PPC stands for Preparedness, Prevention and Contingency, and the plan is Pennsylvania's version of what other states call a stormwater pollution prevention plan, or SWPPP. It maps your drainage areas and outfalls, lists the materials and activities that could pollute runoff, and spells out the controls and procedures you use to prevent that. Our comparison of SWPPPs vs. PPC Plans for PAG-03 explains the differences in detail.
Sampling is where most facilities feel the permit day to day. Samples have to be collected during real storm events, generally early in the discharge, and analyzed by a lab that can meet the permit's quantification limits. The current edition added total nitrogen and total phosphorus to the parameters for every sector. Results go into DEP's eDMR system. Our guides to PAG-03 stormwater sampling and Pennsylvania eDMR reporting cover the practical side. On cost, DEP's fee for PAG-03 coverage is $2,500 over the five-year permit term, collected in $500 annual installments, but the real cost is the plan, sampling, and staff time. Our article on how much a PAG-03 permit costs breaks that down.
How PAG-03 Stormwater Benchmarks and Corrective Action Work
Each sector appendix lists the pollutants you have to sample for, and for many of them DEP has set benchmark values. A benchmark is a target, not a hard legal limit. Going over it once isn't a violation by itself. It's a signal that your controls may not be working as well as they should, and the permit spells out what to do when the signal keeps showing up.
Under the current permit, if the same pollutant exceeds its benchmark at the same outfall in two consecutive monitoring periods, you have to prepare a Corrective Action Plan explaining what you'll do about it. If the exceedances continue for four consecutive periods, DEP requires an additional BMP checklist, and continued problems can lead DEP to require an individual permit instead of general permit coverage. A Corrective Action Plan can also document that an exceedance comes from natural background conditions you can't control. Ignoring repeated exceedances is a violation, even though a single exceedance isn't.
The exact benchmark values, the parameters for each sector, and the timing for corrective action are set in the permit and can change with each edition, so always check the current PAG-03 and your appendix before comparing your results. Our article on benchmark values vs. effluent limits explains how benchmarks differ from enforceable limits, and what to do if your stormwater sampling results are high covers practical next steps.
PAG-03 vs. No Exposure Certification vs. Individual NPDES Permit
PAG-03 is the most common route for covered facilities, but it's one of three. Here's how they compare.
| |
PAG-03 General Permit |
No Exposure Certification |
Individual NPDES Permit |
| Best fit |
Covered facilities with exposed industrial activity |
Covered facilities with nothing industrial exposed anywhere on site |
Facilities that can't use the general permit |
| How you get it |
Notice of Intent |
Certification submitted to DEP for approval |
Full application reviewed site by site |
| Ongoing work |
PPC Plan, inspections, sampling, reporting, training |
Keep everything sheltered and renew on time |
Whatever DEP writes into your permit |
| Term |
Tied to the general permit cycle |
Renewed every five years |
Generally five years, with renewal applications due in advance |
| Common reasons it doesn't fit |
High Quality or Exceptional Value waters, TMDL wasteload allocations |
Any exposure on site, or High Quality or Exceptional Value waters |
Rarely the first choice when another option fits |
No Exposure is the simplest path, but it's all or nothing. DEP won't approve it for part of a site, and if something becomes exposed later, you need permit coverage. Individual permits are more involved and take longer, but they're the route for facilities the general permit doesn't fit. Our articles on what No Exposure means and general, individual, and No Exposure permits go deeper on each.
How PAG-03 Is Reissued and Why Its Requirements Change
General permits don't last forever. DEP reissues PAG-03 on a five-year cycle, and each edition can change who's eligible, what's required, and how. The current PAG-03 was published in the Pennsylvania Bulletin on December 24, 2022, and took effect on March 24, 2023. Existing permittees had to file a new NOI to keep their coverage. Facilities that missed that step lost their authorization to discharge.
The 2023 edition made several notable changes. It added total nitrogen and total phosphorus monitoring to every sector appendix. It added benchmark pollutants for several sectors. It spread the $2,500 coverage fee into $500 annual installments paid with the annual report. It required NOIs to list every outfall at the facility. And it updated the corrective action steps for repeated benchmark exceedances. The edition before it, issued in 2016, was the one that expanded the permit to many more industrial sectors and introduced benchmarks and semiannual sampling for most facilities.
The lesson is that PAG-03 compliance isn't something you set up once. When DEP reissues the permit, your PPC Plan, sampling parameters, schedules, and paperwork may all need updating, and you'll typically need to reapply to stay covered. Keep an eye on DEP's industrial stormwater page and the Pennsylvania Bulletin as the current permit nears the end of its term, and always work from the current edition rather than an old copy in a binder.
How RMA Helps Pennsylvania Facilities With PAG-03
RMA is a family-run environmental consulting firm based in New Jersey, and we work with facilities across Pennsylvania on industrial stormwater. We can help you figure out whether PAG-03 applies, whether No Exposure is a realistic option, or whether you need an individual permit. If PAG-03 is the right route, we can evaluate your drainage and outfalls, prepare your PPC Plan and Notice of Intent, work through DEP's review with you, and help with the sampling, eDMR reporting, annual reports, corrective action, and training that follow. Some facilities prefer to handle parts of this themselves, and our article on whether you can get a PAG-03 permit yourself lays out what that looks like.
If it turns out you don't need PAG-03, we'll tell you. There's no pressure and no obligation. You can call us, send an email, or fill out the form on our website. Whenever you're ready, reach out to RMA and we'll help you figure out the right path for your facility.
