In 2014, Arlington County, Virginia made a choice that would forever shift its stormwater program. The Commonwealth of Virginia had passed new stormwater regulations mandating runoff reductions for land disturbance of an acre or more. Localities in the Chesapeake Bay watershed were required to regulate runoff from land disturbance of 2,500 square feet or greater, including an option to regulate runoff from single family lots. Recognizing the challenge to comply with Chesapeake Bay Total Maximum Daily Load nutrient and sediment reduction requirements, county staff weighed the options. Data showed over 90% of redevelopment in the county was occurring on single family lots. Single family redevelopment was found to generate approximately three additional acres of impervious cover annually – the equivalent of adding the footprint of the Pentagon in impervious cover every 10 years with no stormwater management requirements. And the county also faced the growing challenge of managing lot-to-lot runoff from larger new homes. Arlington County chose to regulate. Starting July 1, 2014, on-site stormwater management was required for all development and redevelopment, including single family lots, with land disturbance of 2,500 square feet or greater. Over the next eight years, nearly 4,000 stormwater management facilities were installed on more than 1,400 single family lots, predominantly bioretention (planter boxes or rain gardens) and permeable pavement systems. Today, these facilities treat 66 acres of impervious surfaces, 1.63 million gallons of stormwater and reduce total phosphorus by 59 lbs./acre/year. In comparison, 472 facilities were installed on 100 non-residential development sites. These facilities treat 44 acres of impervious surface, 945,000 gallons of stormwater and reduce total phosphorus by 57 lbs./acre/year. Regulating single family development and the resulting significant increase in the number of stormwater management facilities does create a heavy workload. To ensure long-term maintenance, Arlington requires self-inspections of each facility every other year using online forms and photo documentation. If the self-inspection and any identified maintenance tasks are not completed, county contractors conduct them at the owners’ expense. Through hard work, persistence and continuous innovation, the compliance rate for the inspection and maintenance of facilities on single family lots is around 95%.