Stormwater Permit Compliance Calculator

Estimate NPDES stormwater permit compliance costs including SWPPP preparation, BMP installation, post-construction management, and ongoing monitoring.

Inputs

Total site acreage

Impervious coverage (%)

Project type

MS4 tier (1-2)

Monitoring period (years)

Tab to move between fields

Results

First-year total cost ($)

$22,000

SWPPP preparation ($)$2,500

BMP installation ($)$6,000

Post-construction BMPs ($)$8,400

Annual monitoring ($)$4,300

Total lifecycle cost ($)$30,600

Detention volume (gallons)32,585

Impervious area (acres)1.2

How to Use This Calculator

Enter Total Site Acreage and Impervious Coverage (%).
Select Project Type (land development, industrial, municipal, etc.) and MS4 Tier (1 or 2).
Set Monitoring Period (years) for the permit term.
Review First-Year Total Cost and SWPPP Preparation cost.
Use this estimate to budget stormwater compliance as part of the project's soft costs.

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