The Housekeeping, Containment, Spill Response, and PPC Plan Details That Decide How a PAG-03 Stormwater Inspection Goes
If your facility has PAG-03 coverage, sooner or later someone from one of PA DEP's six regional offices is going to walk your site and look at your stormwater controls. Those controls are called best management practices, or BMPs, and they're simply the everyday things you do and build to keep pollutants out of rain and snowmelt runoff. Inspectors don't grade BMPs off a textbook list. They look at whether outdoor areas are clean and organized, whether materials are covered or kept inside, whether drums and tanks sit in secondary containment, whether spill kits are stocked and placed where spills happen, whether drain inserts and separators are maintained, whether bare ground is stabilized, and whether your PPC Plan describes the site they're standing on.
Below, we walk through each of those BMPs the way an inspector sees them, including a quick-reference table of what each BMP addresses and what gets checked, the records that back your BMPs up, and what the PAG-03 permit requires when your BMPs aren't keeping sampling results in line. If you'd like a second set of eyes on your facility before an inspector shows up, reach out to RMA and we'll help you figure out where you stand.
Table of Contents
TL;DR
PA DEP inspectors judge your stormwater BMPs by what they see in the yard, not by how well your plan reads. They look for clean, organized outdoor areas, materials kept inside or under cover, secondary containment around drums and tanks, stocked spill kits near the spots where spills happen, maintained drain inserts and separators, stabilized bare ground, and a PPC Plan that matches the site as it is today. Your semiannual inspection and annual training records need to back all of that up, and if sampling keeps exceeding benchmarks, PAG-03 requires a corrective action plan and eventually a mandatory BMP checklist.
What Are Stormwater BMPs Under Pennsylvania's PAG-03 Permit?
PAG-03 is Pennsylvania's general NPDES permit for stormwater associated with industrial activity. A BMP is any practice or physical control that keeps pollutants from getting into the rainwater that runs off your site. Some BMPs are habits, like sweeping the loading dock or keeping dumpster lids shut. Others are hardware, like containment pallets, berms, drain inserts, and oil/water separators. If you want the basics first, our guide to what stormwater BMPs are covers the general concept.
For most PAG-03 permittees, the permit doesn't set numeric discharge limits. It sets its effluent limitations through BMPs. The sampling numbers in each sector appendix are benchmarks, which are yardsticks for whether your BMPs are working, not limits you violate by exceeding them. So on inspection day there's usually no number for the inspector to compare against. The BMPs themselves are what you're being measured on, and the inspector's eyes are the test.
The permit lists minimum BMPs every permittee has to carry out: minimizing exposure, good housekeeping, erosion and sediment control, and spill prevention and response. Each industry appendix then adds sector-specific BMPs, such as dust collection around material transfer points for primary metals plants. All of it gets written down in your PPC Plan, short for Preparedness, Prevention and Contingency Plan, which is Pennsylvania's version of what most other states call a SWPPP. We compare the two in our breakdown of SWPPPs vs. PPC Plans for PAG-03.
PA DEP Stormwater BMP Inspection Table: What Inspectors Check
The same handful of BMPs come up at almost every industrial stormwater visit. The table below lines up each one with the pollution problem it's meant to solve and the specific things an inspector tends to look at. Use it as a walk-around checklist for your own site.
| BMP |
What It Addresses |
What Inspectors Check |
| Good housekeeping |
Dust, debris, trash, and product residue on paved areas |
Swept loading and storage areas, no loose trash, dumpster lids closed, outfalls reachable |
| Covering or relocating materials |
Rain contact with raw materials, products, and waste |
Materials inside or under storm-resistant cover, tarps secured, containers closed when not in use |
| Secondary containment |
Leaks and spills from drums, totes, and tanks |
Containment intact, drain valves closed, no oily water sitting inside, no containers parked outside it |
| Spill kits and response |
Spills reaching storm drains |
Stocked kits near fueling, unloading, and maintenance areas, dry cleanup, staff who know where kits are |
| Drain inserts, separators, and basins |
Oil, sediment, and trash in runoff |
Inserts not torn or clogged, separators pumped, basins not filled with sediment, maintenance records |
| Vehicle and equipment areas |
Leaking fluids and fueling drips |
Drip pans under leaking equipment, maintenance under cover, fluids stored inside or covered |
| Sediment and erosion control |
Soil and fines washing off unpaved areas |
Stabilized bare ground, track-out at exits, stone or riprap at outfalls, no gullies or scour |
| Floor drain control |
Indoor fluids reaching the storm sewer |
No floor drains connected to storm drains |
| PPC Plan accuracy |
A plan that no longer reflects the site |
Site map matches outfalls and storage areas, annual review documented, contacts current |
| Inspection and training records |
Proof that BMPs are maintained |
Semiannual inspection records, annual training documented, findings followed up |
Inspectors are checking whether what's on paper is happening in the yard, and whether it's been happening for a while rather than just the morning they arrived. A freshly swept yard with a three-year-old torn drain insert tells them a lot. If you want a broader look at the visit itself, including who shows up and how findings get handled, see what happens during a PA DEP stormwater inspection.
Good Housekeeping: The First Stormwater BMP PA DEP Inspectors Notice
Inspectors start forming an opinion before they reach your office door. The walk from the parking lot past the loading dock usually tells them whether housekeeping is a routine or an afterthought. PAG-03 requires a routine cleaning and maintenance program for paved areas where dust, debris, and particulates build up, especially around loading, unloading, storage, and processing. It also requires keeping exposed areas free of trash and floating debris, storing materials in appropriate containers, and labeling and tracking waste materials headed for recycling, like used oil, spent solvents, and batteries.
Good housekeeping doesn't mean spotless. What they want to see is evidence of a routine: a sweeping schedule, someone responsible for it, and a yard that looks like it gets attention every week. The classic problem is yard creep, where broken pallets, old equipment, and "we might need that someday" materials slowly fill a back corner that nobody's assigned to.
A few specific items come up often. Dumpster lids have to stay closed when the dumpster isn't in use, and open-top roll-offs need a control like cover or containment, since the permit doesn't allow dry weather discharges from them. Hosing down paved areas into a storm drain is prohibited where it would carry pollutants off site. And outfalls have to stay accessible for inspections and sampling. An outfall buried behind a stockpile or overgrown with brush is a finding on its own, before anyone even looks at the water.
Covering or Moving Exposed Materials Out of the Stormwater
The most effective BMP is the simplest one. Rain that never touches your materials can't carry them off site. PAG-03 requires you to minimize the exposure of loading and unloading, storage, disposal, cleaning, maintenance, and fueling operations to rain, snow, and runoff, either by moving those activities inside or by protecting them with storm-resistant coverings, unless doing so isn't feasible. It also calls for grading, berms, or curbing to keep clean run-on away from dirty areas and to hold polluted runoff in place.
In the field, the findings here tend to be small and repeated. Tarps that blew off in the last storm and never got re-secured. Bagged material sitting on pallets outside because the warehouse was full. Empty drums lined up along a fence with their bungs out. The permit is specific on that last one: containers that could cause a discharge must stay sealed except while in use, and empty containers have to be sealed and stored properly before disposal.
Vehicles and equipment get their own attention. Leaky equipment should be stored inside, or outside with drip pans and absorbents underneath. Equipment being decommissioned should have its fluids drained, and anything that sits unused for a long stretch needs at least a monthly leak check. If you can get every industrial material and activity under a roof, you may not need PAG-03 coverage at all, which is what a No Exposure Certification is for. Our article on what no exposure means under an NPDES stormwater permit explains how that works.
Secondary Containment for Drums, Totes, and Tanks
PAG-03 requires procedures and controls for material storage and handling, including secondary containment and barriers between storage and traffic areas, or something equally effective. Secondary containment is a second barrier that catches whatever leaks out of the primary container, like a spill pallet under drums, a curbed pad under totes, or a dike around a tank. Inspectors almost always walk straight to it because it's where a lot of the oil and chemicals on an industrial site live.
They aren't just checking that containment exists. They look for cracks in concrete dikes, missing drain plugs, and drain valves left open, which turns the containment into a funnel. They look for containment that's half full of rainwater, because a full containment area has no room left for a spill. If there's a sheen on that water, it can't simply be drained to the ground, and how you handle and document that water says a lot about your program.
There's often overlap here with SPCC, the federal oil spill prevention rule. Facilities with more than 1,320 gallons of aboveground oil storage capacity in containers of 55 gallons or more, and a reasonable chance of an oil discharge reaching waters, generally need an SPCC Plan with its own containment sizing and inspection rules. PAG-03 allows an SPCC Plan to help meet PPC Plan requirements as long as the PPC minimums are covered. Our article on the difference between an SPCC Plan and a stormwater plan walks through how the two fit together.
Spill Kits and Spill Response PA DEP Inspectors Expect to See Used
Every facility has spill kits. The question an inspector is really asking is whether yours would get used in the first few minutes of a spill. PAG-03 requires spill kits on site near the areas where spills may occur or where a fast response can be made.
Placement is the first thing that gets checked. A kit locked in a maintenance closet on the other side of the building doesn't do much for the fueling island. Contents come next. A sealed kit that's been sitting untouched for a decade next to a heavily stained patch of pavement tells the inspector spills are happening and nobody's grabbing the absorbent. Some inspectors will ask a forklift operator or a yard worker where the nearest spill kit is and what they'd do with a leaking drum, which is a fair test of whether training stuck.
Reporting is part of spill response too. Under PAG-03, an incident that causes or threatens pollution has to be reported to DEP immediately by phone, and no later than four hours after you become aware of it. Spills of oil or hazardous substances at or above federal reportable quantities also go to the National Response Center at (800) 424-8802. For oil reaching water, our guide to when you have to report an oil spill under the sheen rule covers the threshold that catches a lot of people off guard.
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Storm Drain Inserts, Oil/Water Separators, and Other Structural Stormwater Controls
Structural BMPs are the physical controls that treat or hold runoff: storm drain inserts, oil-absorbent socks and booms, oil/water separators, sediment basins, and filter berms. PAG-03 requires you to properly operate and maintain every BMP you install, and physical BMPs are one of the items your own semiannual inspections have to cover.
This is where inspectors lift grates. Common findings include drain inserts that are torn, overflowing with sediment, or sitting crooked so water bypasses them. Absorbent socks that are black and saturated, or that disappeared months ago. Oil/water separators with no record of ever being pumped out. Sediment basins so full that they no longer slow the water down. Inspectors will often ask when each control was last cleaned or replaced, and "I'm not sure" is a hard answer to defend.
Keep a simple maintenance log for each structural control with the date, what was done, and who did it, and replace inserts and absorbents on a schedule rather than waiting for them to fail. PAG-03 also doesn't allow polymers or other chemicals to treat stormwater without written permission from DEP.
Sediment and Erosion Control on Unpaved Industrial Areas
Gravel yards, dirt lots, and stockpile areas are some of the biggest sources of suspended solids in industrial stormwater. Total suspended solids, or TSS, carry a 150 mg/L benchmark in many of the PAG-03 sector appendices, and unpaved areas are often the reason a facility keeps going over it. PAG-03 requires you to stabilize exposed soils and to place velocity dissipation, such as stone or riprap, at discharge points to prevent channel and stream bank erosion near your outfalls. Your PPC Plan also has to identify areas with a high potential for soil erosion and the measures you'll use to limit it.
Inspectors look for bare, eroding slopes, gullies cutting through the yard, stockpiles with no perimeter control sitting near a drainage path, and mud tracked onto the road at your entrance. They'll also check the outfalls themselves for scour and for sediment fans spreading into the receiving stream or ditch.
If fixing an erosion problem means regrading, paving, or expanding, that work is earth disturbance under 25 Pa. Code Chapter 102, and larger projects can need their own erosion and sediment control plan and construction stormwater coverage under PAG-02. We don't prepare those construction-phase approvals. Your engineer, contractor, or an erosion and sediment control specialist usually handles them, often with the county conservation district. Once the work is done, though, the changed site still has to be reflected in your PPC Plan and PAG-03 coverage, and that's the part we help with.
Does Your PPC Plan Match What PA DEP Inspectors See on Site?
One of the most common findings at industrial stormwater inspections is a plan that describes a different facility. The PPC Plan was written years ago, and since then the outdoor storage moved, a new outfall showed up when the lot was repaved, a tank was added, and the emergency coordinator listed on page two retired. Inspectors often walk the site with your plan in hand, and every mismatch between the map and the ground becomes a question.
PAG-03 requires you to review the PPC Plan at least once a year and update it when needed, and also whenever regulations or the permit change, the plan fails in an emergency, operations change in a way that increases the potential for releases, the emergency coordinators or equipment change, or DEP tells you in writing. Updates have to be kept on site, made available to DEP on request, and documented in your Annual Report.
Some site changes also trigger paperwork beyond the plan. The permit requires you to notify DEP before planned physical changes that could significantly change your discharge, like new paved surfaces or new materials stored outdoors, and to submit an amended NOI when a new outfall is identified or proposed. If you just received a plan and aren't sure how to use it day to day, our quick guide to navigating a new stormwater plan is a good place to start.
Stormwater Inspection and Training Records That Back Up Your BMPs
An inspector only sees your site on one day. Your records are how you show the other 364. PAG-03 requires routine visual inspections at least twice a year, covering areas where industrial materials or activities are exposed to stormwater, the pollutant sources listed in your PPC Plan, areas where spills or leaks happened in the past three years, your outfalls, and your physical BMPs. At least once each calendar year, that inspection has to happen during a storm greater than 0.1 inch, at least 72 hours after the previous measurable storm, while stormwater is discharging. Findings get evaluated and documented in your Annual Report.
Inspectors compare those records against what they see. A stack of inspection forms with every box checked "no issues" doesn't hold up well next to a torn drain insert and a stained containment pad. Records that note a problem, a fix, and a date are far more convincing, because they show your program catches things. Our guide on how to do a stormwater visual inspection the right way covers what a useful inspection record looks like.
Training is the other record that gets checked. PAG-03 requires training for employees and contractors on pollution prevention practices and on stopping, containing, and cleaning up spills, at least annually, and that training has to be documented in the Annual Report. If you're not sure what your team needs, see whether stormwater training is required, or browse RMA's online environmental training library for courses your crew can take on their own schedule.
What Happens When Your Stormwater BMPs Fall Short Under PAG-03
Inspections aren't the only way DEP finds out your BMPs aren't working. Your semiannual sampling results tell the same story. Benchmark exceedances aren't permit violations on their own, but PAG-03 attaches required actions to repeat exceedances at the same outfall. After two or more consecutive exceedances, you have to develop a corrective action plan, or CAP, submit it to DEP within 90 days of the end of the monitoring period that triggered it, and carry it out. Failing to submit and implement the CAP is itself noncompliance.
After four or more consecutive exceedances, you have to submit a new CAP along with DEP's Stormwater BMPs Checklist for your sector and implement every BMP on it, unless you can show a BMP is infeasible or another permit exception applies, such as natural background levels or run-on from a neighbor's property. If exceedances continue, DEP can require you to apply for an individual NPDES permit. Fixing housekeeping, containment, and sediment control is usually what brings results down. Our article on what to do if your stormwater sampling results are high goes deeper on tracking down the source, and our explanation of benchmark values vs. effluent limits covers how the two differ.
How RMA Helps Pennsylvania Facilities Get Stormwater BMPs Inspection-Ready
We're based in New Jersey and work with industrial facilities across Pennsylvania on PAG-03 compliance. We walk a site the way an inspector would, flag the BMP gaps that tend to become findings, and help you fix them in a way that fits how your facility runs. We can also update your PPC Plan so it matches the site, set up an inspection routine your team can keep up with, help with training, and support sampling, eDMR reporting, and corrective action plans. Senior staff do the work, and we'll tell you plainly if something on your site doesn't need fixing.
If you'd like help getting your stormwater BMPs ready for a PA DEP visit, or you just want to talk through what an inspector might flag at your facility, there's no pressure and no obligation. You can call us, send an email, or fill out the form on our website, and someone from our team will get back to you. Contact RMA whenever you're ready, and we'll help you figure out the best next step.
