County of Androscoggin


androscoggin stormwater laws & regulations

Androscoggin Valley has been authorized by the State of Maine to operate a Municipal Separate Storm Sewer System (MS4) permit within 4 municipalities. These 4 municipalities have created similar stormwater management plans to reduce discharge of pollutants into stormwater. Unless otherwise noted, the permit regulation only covers the identified Urban Areas within Androscoggin Valley.

The Androscoggin Valley Stormwater Management Program encompasses 4 Urban Areas:

EXCERPT- Androscoggin Valley SWMP

5. MCM #5 POST-CONSTRUCTION STORMWATER MANAGEMENT

Each permittee shall develop, implement, and enforce a program to address stormwater runoff from new development and redevelopment projects that disturb greater than or equal to one acre, including projects less than one acre that are part of a larger common plan of development or sale, that discharge into the MS4. This program shall ensure that controls are in place that will prevent or minimize water quality impacts.

 

5.2 ANNUAL INSPECTION OF POST CONSTRUCTION BMPS

(Maine DEP MS4 Permit Part IV.H.5.a.iii)

Each permittee shall annually inspect a percentage of post construction BMPs located in the direct watershed of a lake most at risk from new development or in watersheds of an urban impaired stream. If the owner or operator of a post construction BMP hires a qualified third party inspector, the permittee will have no inspection requirements. If the owner or operator of a post construction BMP does a “self” inspection, the permittee is required to conduct the following inspection schedule.

  • 1-10 post construction sites: inspect at least one site, or 40% (whichever is greater)
  • 11-30 post construction sites: inspect at least four sites, or 30% (whichever is greater)
  • 31-60 post construction sites: inspect at least nine sites, or 25% (whichever is greater)
  • 61-100 post construction sites: inspect at least fifteen sites, or 20% (whichever is greater)
  • 101-160 post construction sites: inspect at least twenty sites, or 17% (whichever is greater)
  • Over 160 post construction sites: inspect at least twenty seven sites, or 11% (whichever is greater)

 

Supplemental Documents:

Androscoggin Valley Water Quality Website
NPDES Phase II MS4 Map
Androscoggin Valley NOI

State of Maine Documents:

DEP Permit Application Manual
DEP Stormwater BMP Manual (VOL I, II, & III)
Long-Term Inspection and Maintenance Plan for BMPS