Source controls seek to minimise the generation of stormwater runoff and its associated contaminants.
The reduction in runoff can be achieved through development patterns that limit site disturbance, retain existing natural systems and minimise impervious surfaces.
A reduction in contaminant sources can be achieved through sediment and erosion controls, isolation of hazardous material sites, minimising the use of construction materials that leach contaminants, and appropriate applications of land management practices (e.g. fertilisers and pesticides).