{"id":20572,"date":"2025-11-05T16:10:57","date_gmt":"2025-11-05T21:10:57","guid":{"rendered":"https:\/\/www.carrollengineering.com\/?p=20572"},"modified":"2025-11-05T16:10:57","modified_gmt":"2025-11-05T21:10:57","slug":"ms4-permit-updates-what-you-need-to-know","status":"publish","type":"post","link":"https:\/\/cecorpprod.carrollengineering.com\/?p=20572","title":{"rendered":"MS4 Permit Updates: What You Need to Know"},"content":{"rendered":"<p>The Pennsylvania Department of Environmental Protection (PADEP)\u00a0recently released guidance outlining\u00a0draft updates to the Municipal Separate Storm Sewer System (MS4)\u00a0program. These proposed changes aim to shift the focus from pollutant reduction to volume management \u2014 impacting how municipalities plan, fund, and document stormwater management activities.<\/p>\n<h4 style=\"text-align: left;\" align=\"center\"><strong>Key Updates at a Glance<\/strong><\/h4>\n<ul>\n<li><strong>Volume Management Plans (VMPs)\u00a0will replace Pollutant Reduction Plans (PRPs) and Total Maximum Daily Load (TMDL) plans.<\/strong>\n<ul>\n<li>Goal: achieve treatment of 88% of impervious area within 50 years.<\/li>\n<li>A new\u00a0Maximum Extent Practicable (MEP) Calculator\u00a0will support feasibility and cost analyses.<\/li>\n<li>Certain stormwater practices, such as streambank stabilization and street sweeping, may see reduced or no credit.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Best Management Practices (BMPs) will now be referred to as Stormwater Control Measures (SCMs).\n<p><\/strong><\/li>\n<li><strong>The\u00a0model stormwater ordinance will be updated and must be adopted by permittees, introducing several notable changes, including:<\/strong>\n<ul>\n<li>Allowance for\u00a0residential vehicle washing<\/li>\n<li>New conveyance design standards (up to 100-yr storm +20%)<\/li>\n<li>Homeowner inspection recordkeeping\u00a0requirements (after every precipitation event for 5 years)<\/li>\n<li>Higher rainfall rates for stormwater calculations<\/li>\n<\/ul>\n<\/li>\n<li><strong>Minimum Control Measures (MCMs) remain largely consistent, with a few new requirements:<\/strong>\n<ul>\n<li>Public outreach will include environmental justice areas<\/li>\n<li>Quicker response to illicit discharge complaints (within 5 days)<\/li>\n<li>Documented MOUs (Memorandums of Understanding) with Conservation Districts\u00a0if relying on statewide construction stormwater programs<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4 style=\"text-align: left;\" align=\"center\"><strong>Budget &amp; Timing Considerations<\/strong><\/h4>\n<p>Municipalities should plan for the\u00a0development and funding\u00a0of new VMPs and potential updates to impervious area mapping.<\/p>\n<p>The\u00a0draft permit\u00a0was published January 18, 2025; public comments were due March 19, 2025.<\/p>\n<p>Target submission dates (subject to change):<\/p>\n<ul>\n<li>NOI: September 30, 2026<\/li>\n<li>VMP: September 30, 2028<\/li>\n<\/ul>\n<p><strong style=\"font-size: 24px; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\">Additional Notes<\/strong><\/p>\n<ul>\n<li>Review the model ordinance with your solicitor to avoid conflicts with other municipal statutes.<\/li>\n<li>Retrofitting existing basins or BMPs on municipal property may be a practical way to meet new requirements.<\/li>\n<li>If PRP\/TMDL reductions are not yet complete, municipalities must finish them before applying for renewal under the new regulations.<\/li>\n<\/ul>\n<h4 style=\"text-align: left;\" align=\"center\"><strong>Need guidance navigating these changes?<\/strong><\/h4>\n<p>Carroll Engineering\u2019s Municipal Services team can assist with compliance planning, VMP development, and funding strategies to help your community stay ahead of upcoming MS4 requirements.<\/p>\n<p><strong>Questions?<\/strong>\u00a0Get in touch with our team directly with inquiries or to see how we can support your municipality through this transition:<\/p>\n<ul>\n<li>Andrew Zerby, P.E., Municipal Engineer:\u00a0<a href=\"mailto:azerby@carrollengineering.com\" target=\"_blank\" rel=\"noopener noreferrer\">azerby@carrollengineering.com<\/a><\/li>\n<li>Brady Flaharty, P.E., Municipal Engineer:\u00a0<a href=\"mailto:azerby@carrollengineering.com\" target=\"_blank\" rel=\"noopener noreferrer\">bflaharty@carrollengineering.com<\/a><\/li>\n<\/ul>\n<p>Learn more about Carroll Engineering Corporation&#8217;s full range of services here: <a href=\"https:\/\/cecorpprod.carrollengineering.com\/engineering-services\/\">Our Services<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Pennsylvania Department of Environmental Protection (PADEP)\u00a0recently released guidance outlining\u00a0draft updates to the Municipal Separate Storm Sewer System (MS4)\u00a0program. These proposed changes aim to shift the focus from pollutant reduction to volume management \u2014 impacting how municipalities plan, fund, and document stormwater management activities. Key Updates at a Glance Volume Management Plans (VMPs)\u00a0will replace Pollutant [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":20573,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-20572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"featured_image_src":"https:\/\/cecorpprod.carrollengineering.com\/wp-content\/uploads\/2025\/11\/Horizontal-Email-Body-Picture-1-600x400.jpg","featured_image_src_square":"https:\/\/cecorpprod.carrollengineering.com\/wp-content\/uploads\/2025\/11\/Horizontal-Email-Body-Picture-1-600x600.jpg","author_info":{"display_name":"Krista Madden","author_link":"https:\/\/cecorpprod.carrollengineering.com\/?author=2"},"_links":{"self":[{"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=\/wp\/v2\/posts\/20572","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=20572"}],"version-history":[{"count":0,"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=\/wp\/v2\/posts\/20572\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=\/wp\/v2\/media\/20573"}],"wp:attachment":[{"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cecorpprod.carrollengineering.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}