Phase I of the NPDES Storm Water program began
in 1990 and required medium and large municipal separate storm sewer
systems (MS4s) to obtain NPDES coverage. The expanded Phase II program
began in March 2003 and required small MS4s in urbanized areas to
obtain NPDES permits and implement six (6) minimum control measures.
An urbanized area as delineated by the Bureau of Census is defined
as a central place or places and the adjacent densely settled surrounding
area that together have a residential population of at least 50,000
people and an overall population density of at least 500 people
per square miles. (See list of MS4s.)
The General Storm Water Permit for MS4s was reissued on February
20, 2009 with an effective date of April 1, 2009. The expiration
date is March 31, 2014. Significant changes have been made in the
permit based on comments received by the Agency.
MS4 Permit Requirements:
- The reissued permit requires consideration by permittees of
incorporation of green infrastructure concepts into their storm
water program. For more information see
USEPA's Managing Wet Weather with Green Infrastructure.
- The Agency now requires, for purposes of public notification
and participation, that the Notice of Intent (NOI) for your construction
site projects be submitted to the Agency electronically and be
placed on the permittee's website. Your projects are still automatically
covered under the construction site activities general permit
ILR10 pursuant to this permit.
- The Agency has also developed e-mail addresses for the electronic
submission of your Notice of Intent and annual reports.
- Develop a storm water management program comprised of best management
practices (BMPs) and measurable goals for each of the following
six minimum control measures:
For full descriptions of each measure, including examples of BMPs
and measurable goals, see link below.
- Public education and outreach on storm water impacts
- Public involvement and participation
- Illicit discharge detection and elimination
- Construction site storm water runoff control
- Post construction storm water management in new development
- Pollution prevention/good housekeeping for municipal operations
Submit a completed Notice of Intent. Operators can choose to
share responsibilities for meeting the Phase II program requirements.
Those entities choosing to do so may submit jointly with other
municipalities or governmental entities.The NOI form may be submitted
electronically to: firstname.lastname@example.org.
Submit an annual report to IEPA in June of each year. The annual
report should be submitted electronically to: email@example.com.
The report must include:
- The status of compliance with the permit conditions, including
an assessment of the BMPs and progress toward the measurable
- Results of any information collected and analyzed, including
- A summary of the storm water activities planned for the next
- A change in any identified best management practices or measurable
- If applicable, notice of relying on another governmental entity
to satisfy some of the permit obligations.