Support

Questions, feedback, or a bug to report? We'd love to hear from you.

Frequently asked

Is HydroSewer really 100% offline?

Yes. The release build requests no internet permission, and there is no analytics, telemetry, crash reporting, or account. Your models stay in local files on your device.

What files can I open?

HydroSewer imports EPA SWMM 5 .inp input files and opens native .hydrosewer project files. It can export edited networks back to .inp and save projects as .hydrosewer.

Does it run the real SWMM engine?

Yes. HydroSewer runs the actual EPA SWMM 5 computational engine on-device, in a background isolate so the interface stays responsive.

Which platforms are supported?

HydroSewer runs on iOS, Android, and macOS.

Can I rely on the results for design?

Results are produced by the EPA SWMM 5 engine and must be reviewed and verified by a qualified, responsible engineer before being used for any design, construction, or permitting. HydroSewer does not replace professional engineering judgment.

Email us

Reach Transparent Blue Water LLC directly — we read every message.

info@transparent-blue.com

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An independent tool — not an EPA product

HydroSewer is developed and published by Transparent Blue Water LLC. It is not affiliated with, endorsed by, or sponsored by the U.S. Environmental Protection Agency. SWMM is a trademark of the U.S. EPA, and the SWMM 5 computational engine is public-domain software that this app runs on your device.

Results are produced by that engine and must be reviewed and verified by a qualified, responsible engineer before being used for any design, construction, permitting or other professional purpose. HydroSewer does not certify or warrant compliance with any code, standard or regulation.