Stormwater Pollution Prevention Plan (SWPPP) in Puerto Rico: A Complete Guide

Disturb one acre or more in Puerto Rico and federal law requires a Stormwater Pollution Prevention Plan, better known as a SWPPP (people say "swip"). The requirement comes from the Clean Water Act and is enforced here by EPA Region 2 through the NPDES Construction General Permit. Running behind schedule does not exempt you.

Below: what it is, how it differs from a Plan CES, who signs it, what goes in it, and what inspections look like on a real site.

What Is a SWPPP?

A SWPPP is a site-specific document that spells out how a project will keep rain from washing pollutants into streams, wetlands, bays, and the coast.

Sediment is the obvious one, but runoff from a construction site carries more than dirt:

• Concrete washout and pH-altered water
• Fuels, lubricants, and hydraulic fluids from equipment
• Paints, solvents, and adhesives
• Fertilizers and herbicides used in site revegetation
• Solid waste and construction debris

A SWPPP has to address all of those. That breadth is the main difference from a Plan CES.

SWPPP vs. Plan CES: What Is the Difference?

We get asked this constantly. The two overlap a lot, but they are different documents and a project can need both.

• Plan CES is a Puerto Rico regulatory requirement (DRNA, OGPE) focused specifically on erosion and sedimentation control during earth disturbance. It is required for construction and use permit processing.
• SWPPP is a federal requirement (EPA Region 2, NPDES) that covers the broader range of stormwater pollutants from a construction site, including but not limited to sediment. It applies to sites disturbing one acre or more.

Who Needs a SWPPP in Puerto Rico?

The permit applies to any operator disturbing one acre or more. That covers:

• Residential developments and subdivisions
• Commercial site development
• Road construction and highway projects
• Industrial facility construction
• Utility infrastructure and pipeline installation
• Public sector and government projects receiving federal funding

The owner and the operator (usually the general contractor) are co-permittees, and both sign the certification. Subcontractors sign too, for the parts that apply to their work.

Small sites: under one acre

Under an acre, you are usually outside the permit. The exception is a small site that belongs to a larger common plan of development that will eventually pass one acre. Then the whole plan is covered from day one.

What Must a SWPPP Include?

The permit sets the minimum contents. At a minimum:

1. Project Description

• Project name, address, and total disturbed area
• Description of construction activities and timeline
• Names and contact information for all owners and operators
• Receiving waters: the streams, wetlands, or water bodies that construction site runoff could eventually reach

2. Site Map

• Drainage patterns across the site
• Areas of soil disturbance by construction phase
• Location and type of all BMPs to be installed
• Locations of any environmentally sensitive areas (wetlands, floodplains, drainage channels)
• Areas designated for concrete washout, fuel storage, and waste management

3. BMP Descriptions

For each BMP selected, the SWPPP must describe what it is, where it will be installed, how it will be maintained, and when it will be removed. BMPs fall into two general categories:

• Erosion controls: Measures that keep exposed soil from eroding in the first place: hydroseeding, erosion control blankets, temporary vegetation, slope drains
• Sediment controls: Measures that catch sediment already on the move before it leaves the site: silt fences, sediment basins, inlet protection, stabilized construction entrances

4. Good Housekeeping and Pollution Prevention Measures

This is the section for everything that is not dirt: where equipment gets fueled and serviced, where concrete trucks wash out, where waste sits, and what happens when something spills.

5. Inspection Schedule and Procedures

See the inspection section below. This is one of the most frequently cited deficiencies during enforcement.

6. Certifications

All owners and operators must certify the SWPPP. A qualified inspector must certify each inspection report. Subcontractors must certify compliance with applicable sections.

SWPPP Inspection Requirements

The plan is worth exactly as much as the inspections behind it. Under the 2022 Construction General Permit, qualified personnel inspect on one of two schedules:

• Once every 7 calendar days during active construction, or
• Once every 14 calendar days, plus within 24 hours of any storm that drops 0.25 inches or more

Every inspection gets a written report: date, inspector, weather, the condition of each BMP, and what was fixed or still needs fixing. Keep the logs on site. EPA or DRNA can ask for them at any time.

Once the site is stabilized you can inspect less often, but the SWPPP stays active until final stabilization is reached and you file a Notice of Termination (NOT). Coverage does not end on its own.

Common SWPPP Compliance Mistakes

These are the problems we see most often on compliance reviews and agency inspections in Puerto Rico:

• SWPPP not updated when major site changes, contractor changes, or weather events require amendments
• Missing or incomplete inspection logs: the most commonly cited NPDES violation
• BMPs installed but not maintained: a silt fence with a breach or a sediment basin that hasn't been cleaned out provides no protection
• No concrete washout area: highly alkaline concrete washwater is a regulated pollutant
• Subcontractors not briefed on their obligations under the SWPPP
• NOI not filed: the Notice of Intent to be covered under the NPDES Construction General Permit must be submitted before construction begins

Consequences of Non-Compliance

EPA Region 2 does enforce this in Puerto Rico. Non-compliance can bring:

• Penalties under the Clean Water Act: administrative penalties run to $27,378 per day per violation at 2025 inflation-adjusted rates, and judicial enforcement goes higher
• Stop-work orders
• Mandatory corrective action with agency oversight
• Public notice requirements for significant violations

One more thing about Puerto Rico: it rains. Many parts of the island get more than 60 inches a year, so the storm that tests your BMPs is never far off.