Click to download the NH Stormwater Manual 2025
Resources:
Template for updating municipal stormwater regulations:
Stormwater Management Standards
UNHSC developed the watershed protection standard calculator to assist with determining SCM sizing to meet the WPS:
UNHSC Watershed Protection Standard Calculator
Training:
A recording of the 2025 updated NH Stormwater Manual informational session can be found here: recording of informational session. The recording is of a virtual meeting that reviewed changes made to the manual, and highlighting key contributors who helped with this process.
A recording of the 2025 New Hampshire Stormwater Manual Informational Session, hosted by EBC Water Resources Webinar from September 3, can be found here: 2025 NH Stormwater Manual Informational Session – EBC Water Resources.
July 22, 2025 NH Stormwater Manual Training: Stormwater Manual Outreach Sessions
