Typical roof runoff quality in Minneapolis and Wisconsin
| Constituent | Minneapolis1 | Wisconsin2 |
|---|---|---|
| E. coli (#/100 mL) | 764 | |
| Total Solids (mg/L) | 126 | |
| Total Solids (mg/L) | 10 | 19 |
| Total Hardness (mg/L) | 44 | |
| Total Nitrogen (mg/L) | 0.421 | |
| Ammonia-N (mg/L) | 0.268 | |
| Nitrate-N (mg/L) | 0.586 | |
| Total Phosphorus (mg/L) | 0.104 | 0.24 |
| Total Dissolved Phosphorus (mg/L) | 0.076 | 0.11 |
| Soluble Reactive Phosphorus (mg/L) | 0.065 | |
| Cadmium (mg/L) | 0.0004 | |
| Copper (mg/L) | 0.0075 | 0.01 |
| Lead (mg/L) | 0.0032 | 0.01 |
| Zinc (mg/L) | 0.101 | 0.363 |
| 1 Arithmetic mean concentrations; Reference: Minneapolis Public Works, City of Minneapolis Neighborhood Rain Barrel Partnership Project, 2008 2 Highest geometric mean concentration reported; Reference: Roger T. Bannerman and Richard Dodds, Sources of Pollutants in Wisconsin Stormwater, 1992 |
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