Typical stormwater pollutants, summary of sources and potential concerns for harvest and use

**Typical stormwater pollutants, summary of sources and potential concerns for harvest and use**
Pollutant	Sources	Potential Concerns
Nutrients Nitrogen Phosphorus	atmospheric deposition, sediment (adsorbed nutrients) organic debris fertilizer runoff animal feces combined sewer overflows	Support growth of algae or unwanted microbial growth on the water surface in the storage unit.
Organic Matter	Organic debris (leaves, flowers, pollen, twigs, insect carcasses, etc.)	Decomposition in tank can result in low dissolved oxygen levels, nuisance odors, and release of pollutants from sediments
Suspended Sediment	paved surfaces areas of bare soil/poor vegetative cover construction activity stockpiles	May clog pump intake or distribution Increases maintenance of storage
Chlorides	De-icing chemicals water softening chemicals	Corrosive to metal pipes/plumbing Plant toxicity (irrigation)
Pathogens	animal feces (including bird feces on rooftops) insects/vector organisms drainage area activities such as waste management sewage overflows or leaking sewers	Human health risk
Metals	Vehicle exhaust Roofing materials Drainage area activities that are potential sources of metals (e.g. vehicle fueling or repair)	Plant toxicity
Organic Chemicals Pesticides/herbicides Industrial chemicals and solvents Petroleum-derived chemicals	Drainage area activities that are potential sources of organics (e.g. herbicide/ pesticide use or waste management)	Plant toxicity Human health risk Animal health risk