A stormwater management BMP is a practice that prevents, intercepts or treats pollutants. Here is how to match each BMP to the pollutant fraction your permit names.
A stormwater management BMP is any structural or non-structural practice that prevents, intercepts or treats stormwater pollutants, and the right one depends on which pollutants your discharge carries and whether they are particulate or dissolved. Most sites need a combination. Choosing well means knowing what each practice does and what it leaves open.
What Counts as a Stormwater Management BMP?
The EPA National Menu of Best Management Practices organizes BMPs around the six minimum control measures of the stormwater Phase II rule. EPA states that the list is not all-inclusive and does not stop MS4s from using other technically sound practices, but whatever practice is chosen needs to achieve the minimum measure. The menu groups practices into these topics:
- Public education and public involvement
- Illicit discharge detection and elimination
- Construction site controls
- Post-construction controls
- Pollution prevention and good housekeeping
EPA also notes that effective management often comes from a holistic system approach, because some practices are not effective alone but play a key role in combination with others. That framing matters for permit holders: a BMP is judged as part of a system, not in isolation.
Which BMP Category Fits Which Problem?
The table below sorts common BMP families by what they do well and what they typically leave open. Categories follow EPA's own groupings, including the infiltration, filtration and retention/detention headings on its post-construction BMP page.
| BMP family | What it does well | What it can leave open |
|---|---|---|
| Pollution prevention and good housekeeping | Keeps pollutants from contacting stormwater through sweeping, storm drain cleaning, spill containment and trash management | Residue already on surfaces and pollutants from activities that cannot be moved indoors |
| Erosion and sediment control | Holds soil and particulates on the site | Dissolved metals, dissolved hydrocarbons, nutrients and bacteria that pass through with the water |
| Infiltration and retention/detention | Reduces runoff volume and slows peak flow | Needs space and suitable soils, which paved, built-out sites often lack |
| Media filtration | Targets named contaminants, including dissolved fractions, when media is matched to the pollutant | Needs a media and format chosen for the site, plus an inspection and replacement routine |
EPA's pollution prevention and good housekeeping guidance says programs should first focus on preventing pollution before it happens, because prevention costs less than restoring a waterway. That is the right first layer. It is rarely the last.
Why Does Sediment Control Leave a Gap?
Sediment control captures particulates. Many permit pollutants, such as zinc, copper, phosphorus and some hydrocarbons, travel partly in dissolved form, and a settling basin or screen does not hold what has dissolved into the water. A site can run a diligent sweeping and settling program and still see benchmark exceedances. Our post on choosing a stormwater BMP that cuts dissolved pollutant load covers that gap in more depth, and our guide to reducing heavy metals at recycling facilities applies it to one sector.
Closing the gap means adding a treatment stage whose media binds the dissolved contaminant. We keep two ideas separate when we plan one: the media is what treats, and the format is what holds it. Our principle is that the media follows the contaminant, and the format follows the site.
How Do You Match Media and Format to the Pollutant?
Abtech develops the Smart Sponge® media family. Each media targets a different class of contaminant, and several can be combined in one system when a site carries more than one class.
Formats then follow the infrastructure you already have. The Ultra Urban® Filter is a catch basin insert custom-fabricated to each basin's geometry, so it can retrofit an existing basin without excavation or be specified into new construction, and stainless steel inserts carry a 20-year warranty. Bulk Smart Sponge® media can be loaded into existing pressure vessels, skids, tanks and vaults. Smart Pak®, Smart Bags and EOP units suit vaults, channels, outfalls and discharge points, while skimmers, booms and Smart Drum units capture floating oil, fuel and sheen. Catch basin inserts run passively without pumps or power. Smart Skid systems do not: they are installed with pumps, pressure and flow controls. The stages of a stormwater management system help you decide where in the flow path each format belongs.
How Do You Choose a BMP Step by Step?
For siting practices that manage volume and peak flow, EPA's BMP Siting Tool screens locations by drainage area, slope, soil group and groundwater depth, though EPA says it is no longer updating the tool. For overall design logic, EPA's stormwater BMP design guide describes how goals, hydrology and site conditions shape BMP choice. Our own work starts with a site assessment covering contaminants, typical and peak flows, space, effluent targets and maintenance access. Some projects add laboratory column testing on the customer's own water sample, with pilot testing for larger applications, before full-scale deployment. Our guide to what counts as an NPDES permit stormwater BMP adds the inspection angle.
FAQ: Stormwater Management BMPs
Is a stormwater management swale a BMP?
Yes, a swale is a conveyance and infiltration practice that can slow and filter runoff where space and soils allow. On a paved, built-out site with limited room, a swale may not fit, and a retrofit inside existing catch basins or vaults is often the practical alternative.
Can one BMP satisfy a permit by itself?
Rarely. EPA describes some practices as ineffective alone but valuable in combination, so permit holders usually layer source control, sediment control and treatment of the dissolved fraction. We never promise compliance from a single product.
Which Smart Sponge® media treats dissolved metals and phosphorus?
Smart Sponge® HM targets dissolved metals such as lead, zinc, copper, arsenic and selenium, and phosphorus. If the same discharge also carries hydrocarbons or bacteria, other Smart Sponge® media can be combined with it in one system.
Do all Abtech formats run without power?
No. Catch basin inserts such as the Ultra Urban® Filter are passive, but Smart Skid systems are installed with pumps, pressure and flow controls, so the format you choose determines the power and plumbing requirements.
What records should accompany a BMP?
Keep the inspection schedule, maintenance entries and media replacement dates beside the lab results that justified the BMP, so a reviewer can trace the pollutant named in your permit to the practice chosen and to evidence that it was working.
Related resources
- Choosing a Stormwater BMP That Actually Cuts Dissolved Pollutant Load
- How Can Recycling Facilities Reduce Heavy Metals in Stormwater? A BMP Guide for NPDES Permit Holders
- What Makes up a Stormwater Management System, and How Do You Choose the Right Treatment Stage?
- What Counts as an NPDES Permit Stormwater BMP, and How Do You Choose One That Holds up to Inspection?
- NPDES Permit Stormwater BMP — Abtech Industries
- NPDES Stormwater Pollutant Reduction: BMP Guide | Abtech — Abtech Industries