• The Green Infrastructure/Low Impact Development Post-Construction Best Management Practices guide below is to be used for new development and re-development projects that disturb equal to or greater than or one acre; as well as projects less than one acre that are part of a larger common plan of development or sale. 


  • In 2014, the Environmental Protection Agency issued a watershed-based Municipal Separate Storm Sewer System (MS4) Permit for stormwater in 2014. This permit requires all 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, to evaluate opportunities for the use of Green Infrastructure/Low Impact Development (GI/LID) techniques in site design.  Bernalillo County now requires all commercial and some residential applicants to complete the Stormwater Post-Construction Evaluation Form below to look for opportunities to incorporate GI/LID. Using GI/LID techniques minimizes stormwater quality impacts related to post-construction runoff. Improving stormwater quality protects the Rio Grande and our community.​


For additional information about the watershed-based MS4 permit, please visit EPA Regulation of Stormwater in Bernalillo County (http://www.bernco.gov/public-works/epa-regulation-of-stormwater-in-bernalillo-county.aspx).

There are changes during land development that change the hydrologic properties of a given watershed. Generally this increases the pollutant load transported by runoff compared to predevelopment conditions.

Some revisions have been made by Bernalillo County to the calculation methods used to determine the effects of those changes and how they will help to prevent or reduce pollutants in stormwater discharges from reaching the Rio Grande. These revisions will go into effect 30 days after the posting of this information on May 12, 2021.  

More information can be found in these documents:

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