SWPPP Generator for Construction

Your SWPPP, done in 20 minutes.
Not 2 weeks.

SWPPP Builder turns your project address and site details into a complete, permit-ready Stormwater Pollution Prevention Plan — built to your state's CGP requirements. No engineer. No back-and-forth. No $3,000 bill.

Generate my SWPPP — $97 → See what's included ↓
Covers all 50 states
Based on EPA 2022 CGP
Instant PDF + Word download
Built by a licensed civil engineer

Every site over 1 acre needs a SWPPP.
Most contractors are winging it.

$25k

Average EPA fine for a first-time NPDES violation on a construction site — and inspectors are actively increasing enforcement in 2025.

$3,500

What a civil engineer typically charges to prepare a basic SWPPP. Often $5,000+ if they have to do the detention calcs too.

2 wks

How long it usually takes to get a SWPPP back from an engineer — after the back-and-forth, reviews, and stamp queue.

72%

Of small builders report using a "template they found online" that wasn't written for their state's current permit requirements.

What changes

The builder's experience, before and after

Before SWPPP Builder
✗ Call engineer, wait 3 days for a callback
✗ Pay $1,500–3,500 upfront before you know if it'll pass
✗ Get a PDF back with no explanation of what any of it means
✗ Subcontractors don't know what they signed
✗ Inspector visits and finds the SWPPP doesn't match the current site conditions
✗ Scramble to update it, pay for another engineer revision
→
After SWPPP Builder
✓ Fill out a 10-minute project form — address, acreage, soil type, schedule
✓ Get a state-specific SWPPP document in 20 minutes
✓ Clear plain-English explanations for each BMP you're required to install
✓ Signature pages pre-formatted for owner + all subcontractors
✓ Amendment form included — update site conditions yourself in minutes
✓ Save the engineer fee for something that actually needs a stamp

What you get

A complete SWPPP document — not a blank template

Most "SWPPP generators" give you a fillable form. SWPPP Builder produces a fully written document — narratives, calculations, and BMP descriptions — populated with your actual project data.

SWPPP Builder — Ridgeline Commercial Phase 1 — SWPPP_v1.docx

Contents

1 Site Description
2 Runoff Calculations
3 Site Map
4 BMP Schedule
5 Construction Sequence
6 Inspection Procedures
7 Spill Prevention
8 Final Stabilization
9 Certifications
A Appendix: Calcs
⚡ Auto-generated from your inputs

Section 1 — Site Description

Ridgeline Commercial Phase 1
TCEQ — Texas CGP TXR150000
4.7 acres (triggers NPDES)
Group C — Sandy clay loam
Barton Creek (303(d) listed)
Ridge Development LLC

The proposed construction activity consists of site grading, utility installation, and foundation work for a commercial development located at 4821 Ridgeline Blvd, Austin TX 78745. The project will disturb approximately 4.7 acres of a 6.2-acre parcel. Pre-development land use is undeveloped grassland with moderate slopes (2–8%). Post-development impervious cover will be approximately 68%...

Document structure

Every required section. Written, not blank.

01
Site Description
Project name, location, permit authority, operator info, disturbed acreage, receiving water body, soil type, and existing land use — all pulled from your inputs and written into compliant narrative language.
⚡ Auto-written
02
Runoff Calculations
Pre- and post-development peak flows using the Rational Method (Q=CiA), with NOAA rainfall intensity auto-pulled for your exact location. Detention requirement flagged if needed.
⚡ Auto-calculated
03
Site Map Guidance
Instructions and a legend template showing where to locate each BMP on your grading plan. Includes drainage direction arrows, discharge points, and limits of disturbance.
⚡ Template + instructions
04
BMP Selection & Narrative
Based on your site slope, soil type, and disturbed area, the app recommends silt fence, stabilized construction entrance, inlet protection, sediment basin, etc. — and writes the installation and maintenance narrative for each.
⚡ Auto-selected + written
05
Construction Sequence
Phased construction sequence tying BMP installation to grading activities. Required by most state CGPs. Written in plain language so your super can actually follow it.
⚡ Auto-drafted
06
Inspection Procedures
State-specific inspection frequency, rain event triggers (typically ≥0.5"), inspector qualification requirements, and a blank inspection log form — formatted for your permit authority.
⚡ State-specific
07
Spill Prevention & Concrete Washout
Required language covering fuel storage, chemical handling, concrete washout location, and spill response procedures. Sized and located based on your project type.
⚡ Auto-drafted
08
Final Stabilization Plan
Permanent stabilization method (seed mix, sod, pavement), 70% vegetative cover threshold, and Notice of Termination (NOT) trigger language — so you know exactly when you're done.
⚡ State-specific triggers
09
Certification & Signature Pages
Owner certification, contractor certification, and subcontractor co-permittee pages — pre-formatted with the correct legal language for your state CGP. Print, sign, keep on site.
⚡ State-specific legal text

Pricing

Straightforward. No subscriptions to start.

One project or a whole season — there's a plan that makes sense.

One-time
Single Project
$97 / project

One complete SWPPP. Yours to keep.

  • ✓ Full SWPPP document (PDF + Word)
  • ✓ Your state's current CGP requirements
  • ✓ Runoff calcs + BMP selection
  • ✓ Signature pages for all parties
  • ✓ 1 free amendment within 30 days
Get started →
Most popular
Builder
$79 / mo

Up to 8 projects per month. Best for active GCs.

  • ✓ Everything in Single Project
  • ✓ Up to 8 SWPPPs per month
  • ✓ Unlimited amendments
  • ✓ Project archive & history
  • ✓ Priority email support
  • ✓ Inspection log templates
Get started →
Team
Contractor Pro
$149 / mo

Unlimited projects + team access.

  • ✓ Everything in Builder
  • ✓ Unlimited projects
  • ✓ 3 team seats
  • ✓ Custom company letterhead
  • ✓ PE review add-on (coming)
  • ✓ API access (coming)
Get started →
$3,400
avg engineer fee saved per project
35×
ROI on the Builder plan at 1 project/mo
20 min
average time to complete your SWPPP
50
states covered, always up to date

Common questions

Before you ask your engineer

It depends on your state and disturbed acreage. Many states allow non-engineer SWPPPs for sites under 5 acres — and even larger sites in some jurisdictions. SWPPP Builder tells you exactly what's required for your state upfront. For sites that do require a PE, SWPPP Builder's calc package significantly reduces the time (and bill) an engineer needs to review and stamp it.
For most small-to-mid commercial and residential sites, yes — the document structure, required sections, and BMP narrative are aligned with your state's CGP requirements. SWPPP Builder outputs are positioned as calculation worksheets and SWPPP drafts, not PE-stamped designs. For complex sites with large detention requirements, you may still need engineering review — SWPPP Builder tells you when that threshold is crossed.
SWPPP Builder maintains a database of CGP requirements by state — inspection frequency, rainfall thresholds, BMP requirements, and SWPPP format. When you create a project, the document is generated using the rules for that specific state. We update templates when state permits are revised (most renew on 5-year cycles).
Yes — all plans (and the Builder/Pro subscriptions) include amendment generation. Log back in, update the changed conditions (new disturbed area, added BMP, changed drainage outlet), and download a revised document with an amendment log appended. No starting from scratch.
SWPPP Builder generates a pre-filled NOI template for your state. Actual filing is done through your state's eDMR or permit portal — we walk you through exactly where to go and what to attach. Direct e-filing integration is on the roadmap for 2026.