Know before this happens...

Stormwater runoff at a construction site

If you're a California QSD, QSP, or inspector, the 2022 Construction General Permit requires pre-storm inspections whenever a significant rain event — a Qualifying Precipitation Event (QPE) — is in the forecast. Miss one, and you're out of compliance.

Manually tracking forecasts across all your sites — every day, all season — is exactly the kind of task that gets missed when things get busy. QPE Assistant handles it for you.

We pull 7-day forecast data directly from NOAA's National Weather Service and apply the state's own compliance formula to each of your sites. When a QPE is coming, you'll know — before it arrives.

  • Get a daily email showing upcoming QPEs across all your sites.
  • Forward relevant reports to your inspectors automatically.
  • Keep a full forecast history for audits and quality control.

Try it free. Our evaluation plan is fully functional — set up a site, run reports, and get real daily forecasts with no credit card required and no obligation. Get started →

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QPE Assistant was recently featured during Stormwater Awareness Week!


QPE Assistant is a product of feedback from the stormwater community. Please contact us with any questions, comments or suggestions for improvement.

We hope you find it useful.