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SWMLabs

Professional-Grade Nutrient Loading Analysis Tool for Florida Engineers

Model your treatment train, hit FDEP removal targets, and export a submittal-ready Technical Report

Scope Your ProjectExplore the Live DemoHow it Works

Scoping your project takes about two minutes: draw your project boundary or upload a shapefile, see which performance standard applies, and get your tier and exact price. No account needed.

Built for submittals in all five Florida Water Management DistrictsSFWMDSJRWMDSWFWMDNWFWMDSRWMDFDEP6,894 WBIDs covered statewide

What SWMLabs Does

  • Site classification, automatic

    Draw the boundary. SWMLabs determines the project's HUC12, rainfall characteristics, existing Land Use and Soil coverages, and downstream Impaired Waterbodies and Outstanding Florida Waters, automatically establishing the Nutrient Loading reduction requirements.

    § 8.3.3 to 8.3.4 · FDEP · SSURGO

  • Nutrient loading, done for you

    Pre- and Post-Development Annual Runoff and TN/TP Loadings for every Land Use, straight from the Appendix N runoff coefficient tables, automatically interpolated by Meteorological Zone, DCIA %, and non-DCIA Curve Number.

    Appendix N · Harper and Baker (2007)

  • BMPs routed on a canvas

    Drop in BMPs and connect them in the order stormwater moves. Volume, Concentration, and Load update at every node, perfect for testing BMP performance and refining your system's design. The routing diagram draws itself and drops straight into your submittal Report.

    Appendix O · per-node treatment train

  • Technical Report, submittal-ready

    Every methodology, every worksheet, every determination, and an Override Log of your judgment calls. No black box. No mystery calculations. Just a fully transparent report, ready for approval.

    PDF · Parts 0 to IV · Appendices A to E

See a real Technical Report

A complete report generated by the platform for a Hardee County project, ready for ERP submittal. This is the deliverable.

  • Every derivation shown: Appendix N interpolation, efficiency curves, Appendix O lookups, exactly as calculated.
  • An Override Log of every value the Engineer of Record substituted, original and replacement side by side.
  • A Verification ID on every report that a reviewer or client can check online, no account needed.
Read the sample reportVerify a report

See it work before you sign up

Click through the app yourself, or spend thirty minutes building a project with a licensed PE.

On your own, right now

Explore the live demo

Open the app as a demo visitor and click through every step yourself. No account needed.

Explore the Live Demo

Thirty minutes, live

Book a one-on-one

A live walkthrough with Tim Gavin, P.E., Co-Founder and Head of Engineering. Build a project together, run the Nutrient Loading Analysis, and see the Technical Report, with questions answered as you go.

Book a One-on-One

Pay per project from $300, or subscribe from $400 per seat per month with unlimited projects. See pricing

The SWMLabs Difference

The same ERP submittal, step by step: what is done by hand today and what SWMLabs produces instead. It replaces the spreadsheet and the separate BMP sizing tool with one workspace - the same Harper and Baker (2007) methodology, one report, every derivation shown.

  1. Site classification

    By handRegulatory maps checked manually, flowpath traced by hand

    With SWMLabsRegulatory classifications automatically derived from the boundary and each outfall

  2. Runoff coefficients

    By handAppendix N tables interpolated manually, row by row

    With SWMLabsAppendix N automatically interpolated for every land use row, work shown

  3. Nutrient loading

    By handLoads calculated manually in a spreadsheet, checked twice

    With SWMLabsTN and TP automatically computed and documented, line by line

  4. BMP sizing

    By handBMPs sized manually in a separate tool, removals stacked by hand

    With SWMLabsBMP worksheets automatically built on the canvas, node by node

  5. Routing diagram

    By handRouting diagram redrawn manually in CAD for the submittal

    With SWMLabsRouting diagram automatically captured from the canvas

  6. Design revisions

    By handEvery downstream sheet redone manually after each design change

    With SWMLabsDownstream loads automatically recompute, worksheets flagged for review

  7. The report

    By handNarrative and appendices assembled manually

    With SWMLabsEvery derivation automatically shown, with Override Log and Verification ID

What engineers are saying

I love the BMP routing diagram! I typically make a BMP map for my submittals and this would eliminate that need. I also appreciate the explanations of the methodology at each calculation step - it's almost as if you are walking through it with a reviewer.

Jessie P., P.E.

Tampa, FL

In my experience, SWMLabs is an intuitive application that knocks hours off of BMP development. Geolocated HUC12, soils, and land use information makes project setup quick and easy. The interface for setting up BMPs is strait forward and easy to adjust. Finally, the reporting is thorough and makes a great addition to the drainage narrative.

Jeff T., E.I.

Clearwater, FL

The overall user experience is very good. I can tell a lot of time went into the layout and careful placement of the tools.

Joel B., P.E.

Fort Myers, FL

I like the look and feel, the workflow and the GIS integration.

Mark T., P.E.

Tallahassee, FL

This platform makes nutrient removal modeling visual, intuitive, and efficient, allowing users to confidently develop accurate models and produce a complete report ready for regulatory submittals.

Luis C.

Orlando, FL

Built by Engineers who've done the work

combined Florida land development PE experience
30+ years
Outstanding Technical Achievement Award recipient
FES

Built by licensed Professional Engineers who have spent their careers navigating Florida's ERP permitting process, not software developers guessing at regulatory requirements. Every feature in SWMLabs reflects methodology that has been tested against real projects and real submittals.

  • Webinar · book any time

    One-on-One Demo

    Any time · Online

    Details and booking
  • Where we'll be

    2026 FSA Winter Conference

    December 2 to 4, 2026 · Embassy Suites by Hilton Orlando Lake Buena Vista South, Kissimmee, FL

    Event details

Start with a price, or start with a project.

Scope Your Project

About two minutes: draw your project boundary or upload a shapefile, see which performance standard applies, and get your tier and exact price. No account needed.

Start Your Free Trial

Build projects in SWMLabs free for 14 days: draw, model, and run the full Nutrient Loading Analysis. No charge today, and nothing is billed until day 14 or your first Technical Report.