Small MS4s operators located outside of the urbanized areas may be required to obtain a MS4 General Permit if there exists or there is the potential for significant water quality impairment. The National Pollutant Discharge Elimination System (NPDES) permitting authority (EPA) could make this determination by itself or after receiving a petition from concerned citizens or groups.
Regulated Towns
- What is a Small MS4?
- List of Regulated Towns
- Map of Regulated Towns in NH
- NH Regional Stormwater Coalitions
Regulation Requirements
- What is required for an MS4 under Phase II?
- Stormwater Management– Six Minimum Control Measures
- Forms and Instructions
- Detail Maps of NH Regulated Towns
Links of Interest
- News for Regulated MS4s
- NH Regional Stormwater Coalitions
- Additional Links and Resources of Interest
EPA Guidance Links
The following EPA guidance provides further information on regulated small MS4 coverage:
- Storm Water Phase II Compliance Assistance Guide
- Storm Water Phase II Final Rule: Urbanized Areas: Definition and Description (Fact Sheet 2.2)
- Storm Water Phase II Final Rule: Who's Covered? Designations and Waivers of Regulated Small MS4s (Fact Sheet 2.1)