New York Mills
Oneida County, NY
Post Construction Stormwater Management
This Minimum Control Measure emphasizes the reduction or elimination of pollutants to the municipal separate storm sewer system that may come from post-construction runoff after new development and redevelopment projects. The term post-construction is used to categorize runoff from a site with impermeable surfaces, such as buildings, roads and parking lots that remain after construction ends.
If unchecked, the increased impervious surface associated with development may increase stormwater volume and degrade water quality, which can harm rivers and streams. Methods to mitigate stormwater impacts from new development include practices to treat, store, and infiltrate runoff onsite before it can affect water bodies downstream. Innovative site designs that reduce imperviousness and smaller-scale low impact development practices dispersed throughout a site are a few to achieve the goals of reducing flows and improving water quality.
Either separately or in combination with the Minimum Control Measure for Construction Site - Stormwater Runoff Control, the MS4 (with land use control capabilities) is required to adopt a new local law, amend existing local laws and ordinances, or establish equivalent regulatory mechanisms to reduce discharge of pollutants in stormwater runoff after completion of construction projects.
In addition to post-construction requirements that MS4's place on developers, post-construction stormwater controls are also required of developers directly in Stormwater Pollution Prevention Plans (SWPPPs) under the SPDES General Permit for Stormwater Discharges from Construction Activity. However, the information presented on this webpage will focus on Post-Construction Stormwater Management practices and activities implemented by the regulated MS4.
In general, the MS4's post-construction stormwater management program should: provide for the review of post-construction stormwater management measures in SWPPPs; ensure stormwater management practices used are consistent with technical standards in the New York State Stormwater Management Design Manual; address ongoing maintenance of structural and non-structural management measures; provide for inspection of stormwater management measures and practices; maintain and inventory of post-construction practices; and, address compliance and enforcement activities.
Table Of Contents:
Selected Activities and BMPs:
To meet the Construction Site - Stormwater Management requirements, the MS4 has selected the following Best Management Practices (BMP's) and activities to ensure the reduction of all pollutants of concern in stormwater discharges to the maximum extent practicable. The BMPs and activities describe both structural and non-structural practices.
These activities include:
- Adoption of local ordinance.
- Compiling an inventory of stormwater management facilities.
- Annual inspections of municipally-owned stormwater management faciities and privately-owned but municipally inspected by agreement facilities.
- Maintenance, as needed, of stormwater management facilities.
Regulated communities are required to collect and report information about the development and implementation of their stormwater program. Specific information that the MS4 is required to collect is generally included in the Annual Report and may also be reflected in related Self-Assessments (as applicable). MS4s are also required to identify "Measurable Goals" that will help them evaluate accomplishments and progress over time. The following "Measurable Goals" have been specifically identified for this Minimum Control Measure:
Activities and BMPs that have been accomplished to date for this Minimum Control Measure are included within the required MS4 Stormwater Annual Report form and Municipal Compliance Certification. Copies of these documents can be found at the following link (Annual Reports). Copies of various documents and specific products relating to this minimum control measure are included under "Related Documents".
A summary of the effectiveness of this program, associated BMPs, activities and an assessment of measurable goals can be found under the heading "Program Reporting and Effectiveness".
Other Related Links: