On January 15, 2021, the USEPA issued the 2021 Multi-Sector General Permit (MSGP) for industrial stormwater discharges. The new stormwater permit will become effective on March 1, 2021 and will replace the 2015 MSGP. This Permit has an aggressive timeline, that will require planning to meet the newly established USEPA’s deadlines.  

Below are some key highlights from the updated permit. If you have any questions about the the new MSGP or how these changes will impact your business, please reach out to us for assistance.  

What you need to know about the new MSGP for industrial stormwater discharge:  

  • To renew your permit, a Notice of Intent (NOI) is due May 30, 2021  
  • You must update your existing Stormwater Pollution Prevention Plan (SWPPP) (or develop one if you do not have an existing SWPP) prior to submitting your NOI on May 30, 2021 
  • You must make your SWPPP publicly available by either attaching it to your NOI, including a URL in your NOI, or providing additional information from your SWPPP on your NOI 

Nuances to the 2021 MSGP Stormwater Permit: 

  • Certain facilities will now be required to conduct indicator analytical monitoring for three parameters – pH, Total Suspended Solids (TSS), and Chemical Oxygen Demand (COD). 
  • Certain facilities will now be required to conduct “report-only” indicator analytical monitoring for polycyclic aromatic hydrocarbons (PAHs) bi-annually (twice per year) during their first and fourth years of permit coverage. This requirement applies to operators in all sectors with stormwater discharges from paved surfaces that will be sealed or re-sealed with coal-tar sealcoat where industrial activities are located during coverage under this permit and all operators in sectors A. 
  • Applicable facilities must conduct quarterly benchmark monitoring in their first and fourth years of permit. 
  • Facilities discharging to impaired waters without an USEPA-approved or established Total Maximum Daily Load (TMDL) must complete annual monitoring for discharges of certain pollutants. 
  • A three-level structure of advancement and responses, triggered by benchmark exceedances, is now required to keep follow-up actions clear, timely, and proportional to exceedance frequency and duration. 

For more information, see EPA’s 2021 MSGP or give one of our EHS/Compliance experts a call to talk through how the changes to the MSGP impact you.