In March, the National Association of Clean Water Agencies (NACWA) released a MS4 stormwater permitting guide, described as a resource for both beginners and experts in the field. The guide covers basic MS4 concepts, permit requirements, water quality standards, and total maximum daily loads. Other topics include permit appeals and enforcement actions. Communities can consult this guide as they start work on their stormwater management program (SWMP) plans and Notice of Intent (NOI). In Massachusetts, the permit went into effect on July 1, 2018, and the NOI must be submitted to EPA within 90 days of this date.