Summary of sate of Minnesota water quality guidelines for stormwater harvesting and reuse systems for Irrigation
Summary of sate of Minnesota water quality guidelines for stormwater harvesting and reuse systems for Irrigation
Link to this table
| Water Quality Parameter | Impact of Parameter 10 | Water Quality Guideline – Public Access Areas | Water Quality Guideline – Restricted Access Areas | Water Quality Guideline – Irrigation of Food Crops | Comments |
|---|---|---|---|---|---|
| E. coli | Public Health | 126 E. coli/100mL | Guidance to be determined at a future date | Guidance to be determined at a future date | 2,3 |
| Turbidity | Irrigation System Function | 2-3 NTU | Guidance to be determined at a future date | Guidance to be determined at a future date | 4,5 |
| TSS | Irrigation System Function | 5 mg/L | Guidance to be determined at a future date | Guidance to be determined at a future date | 4,5,6 |
| pH | Plant Health | 6-9 | Guidance to be determined at a future date | Guidance to be determined at a future date | 4 |
| Chloride | Plant Health; Corrosion of Metals | 500 mg/L | Guidance to be determined at a future date | Guidance to be determined at a future date | 7 |
| Zinc | Plant Health | 2 mg/L (longterm use); 10 mg/L (shortterm use) | Guidance to be determined at a future date | Guidance to be determined at a future date | 8 |
| Copper | Plant Health | 0.2 mg/L (longterm use); 5 mg/L (shortterm use) | Guidance to be determined at a future date | Guidance to be determined at a future date | 8 |
| Temperature | Public Health | Guidance to be determined at a future date | Guidance to be determined at a future date | Guidance to be determined at a future date | 9 |
2 – MPCA Bacterial Impairment Standard: 126 E. coli/100mL (geometric mean of 5 samples in 30 day period); no individual samples greater than 1260 E. coli/100mL
3 – EPA 2012 Recreational Water Quality Criteria – Recommendation 1 (Estimated illness rate = 36/1000)
4 – Based on typical range/value for water reuse programs in other states
5 –Useful for distribution system design, but often used a general indicator parameter, too.
6 – TSS guidance provided by Cathy Tran, DLI
7 – Per Table R.3b.6 in Metropolitan Council Stormwater Reuse Guide
8 – Suggested by Bruce Wilson. Per Table R.3b.5 in Metropolitan Council Stormwater Reuse Guide
9 - Recommendation from Anita Anderson on 12/6/2012 email as temperature impacts bacterial growth
10 –Per Tables R.1a.1 and R.3b.5 in Metropolitan Council Stormwater Reuse Guide