NSP Tools

NSP Tool Page Index

2016 MS4 Permit Year 01 Requirements

The NSP has prepared documents to summarize the upcoming Year 01 MS4 Permit requirements.

    • Year 01 Permit Summary, Detailed one page to help you understand what is needed for the first year of MS4 implementation.
    • Year 01 Permit Checklist, Simplified one page to serve as checklist for what is needed for the first year of MS4 implementation.

2016 MS4 Permit Summary

The NSP has prepared several documents summarizing the 2016 MS4 permit for quick reference by various audiences. Note these documents are specific to the TMDLs and impaired waters in our communities and may not be applicable outside the NSP service area.

MS4 5-Year Planning Worksheet

This excel worksheet or PDF file serves as a quick planning tool for MS4 staff. It allows you to make notes on what tasks  you intend to complete in-house, with consultants, or with the NSP, and to indicate what year you plan to start. Areas where the NSP expects to be able to provide members with assistance over the five year permit term are noted. It can also serve as a quick double check for a plan prepared in house or by a consultant to ensure nothing is being missed.

Annual Progress Reports

The NSP prepares an annual progress report that summarizes what was accomplished in the prior year. Member communities may select items from this report to include in their own annual reports to EPA, or may attach it in whole.

Stormwater Management Plan (SWMP) Template

Master NSP SWMP Template

The NSP is preparing a complete SWMP template with specific requirements for towns within the Neponset Stormwater Partnership. The templates have been created for the MS4 Permit required six minimum control measures (MCMs) with additional specific requirements from the MS4 Permit Appendix to offer guidance for the written SWMP deadline of June 30th, 2018.

  • NSP Model SWMP Template, MS Word – Coming Soon!

Individual NSP SWMP Templates

Illicit Discharge Detection and Elimination (IDDE) Program

Many Towns in the Neponset River Watershed have outfalls that discharge to a wetland or waterway that that are not identified as a stream segment or assessment unit by MassDEP. These are often smaller tributaries to the stream segment that is identified by MassDEP. The clarification sheet included in the link below summarizes a conversation with EPA that provides additional details of mapping outfalls considered “discrete conveyances” such as paved waterways and curbs, as well as the sampling requirements of unmapped waterways.

Towns must also maintains an inventory of all dry weather and wet weather SSOs as a part of this program. An inventory of all SSOs that occurred within 5 years prior to the effective date of the permit must be prepared within the first year of the MS4 Permit and is updated at least annually as part of the annual report. The following template can be used for preparing the inventory of SSOs.

When a source of an illicit discharge is identified, the Towns can document the removal process using the NSP Illicit Discharge Removal Tracking Form. This form can be included in the Town’s annual report.

In order to document the process followed and results of wet and dry investigations in each catchment, the NSP has created a Catchment Investigation Summary Report form. This form briefly describes the dates of the investigation, what investigation strategy was used, any system vulnerability factors discovered, any updates to mapping needed or completed, overview of sampling results, and the conclusions of the investigation. The report will also briefly outline measures taken to isolate the source of an illicit discharge, and any needed or completed repairs.

Sample IDDE Plans and Protocols

Boston Water and Sewer Commission (BWSC) developed an Illicit Discharge Detection and Elimination Plan that describes the methodologies the BWSC will employ for identifying sub‐catchments for illicit discharge investigations, performing investigations in contaminated drainage sub‐catchments owned by BWSC and CSOs downstream of regulators, eliminating illicit discharges, and confirming completion of sub‐catchment investigations. With permission of BWSC, we have provided the full BWSC IDDE plan, as well as selected excerpts and forms in the links below:

BWSC IDDE Plan (2014), PDF

Selected excerpts and forms:

From BWSC IDDE Plan Appendix D:

From BWSC IDDE Plan Appendix E:

From BWSC IDDE Plan Appendix F:

MAPC Catchment Information:

MAPC in Partnership with the Neponset River Watershed Association has developed an ArcGIS tool to tackle the task of automatically delineating stormwater catchments areas using topographic data. MAPC published and maintains a set instructions and of ArcGIS tools that can be applied for any municipality in Massachusetts and potentially beyond. See links below to access the toolkit as well as instructions for implementing it using ArcGIS and CommunityViz, an ArcGIS add-in.

NSP Outfall Inventory and Catchment Prioritization Tool:

The NSP Outfall Inventory and Prioritization Tool is intended to help communities plan, document, and report on their IDDE work at various key stages by providing a framework for ranking and tracking outfalls and their associated catchments.

The NSP Outfall Tool is distributed as an unlocked MS Excel spreadsheet (see link below). Provided below is a link to a blank spreadsheet as well as a a spreadsheet populated with sample data for guidance. While we have provided instructions for the tool and our suggested approach to using the Outfall Tool below, communities are welcome to modify the Tool in any way they see fit to adapt it to their own approach.

Note: If you cannot download the zipfiles, please contact walter@neponset.org to request the spreadsheets in email form.

Town Bylaws:


This model NOI will enable any NSP member to prepare their NOI quickly. A few basic fields will need to be customized and each community will need to indicate responsible parties for the various tasks. The model NOI includes a partially pre-filled copy of the EPA NOI PDF, instructions, and attachments containing the data needed to fill-in the three major tables in the NOI.

MS4 Documents:

EPA Stormwater Resources:

Other Documents: