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Water Supply, Brandon, South Dakota. NPDES permit SD0028654, in force until Oct 31, 2029. Last 12 months: over a limit once (last October 2025), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Conductivity, 30-day average | 2820 umho/cm | ≤ 2500 umho/cm | 13% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Conductivity | 30-day average | report only (umho/cm) | Jan, Feb, Mar, Nov, Dec | 001 |
| Conductivity | 30-day average | ≤ 4375 umho/cm | Apr–Oct | 001 |
| Conductivity | daily maximum | report only (umho/cm) | Jan, Feb, Mar, Nov, Dec | 001 |
| Conductivity | daily maximum | ≤ 4375 umho/cm | Apr–Oct | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Alkalinity, total [as CaCO3] | 30-day average | ≤ 1313 mg/L | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | ≤ 1313 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Radium 226, dissolved | rolling average | report only (pCi/L) | all year | 001 |
| Radium 226, dissolved | daily maximum | report only (pCi/L) | all year | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| Flow, total | monthly total | report only (Mgal) | all year | 001 |
| Solids, total dissolved | 30-day average | ≤ 2500 mg/L | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 4375 mg/L | all year | 001 |
| Duration of discharge | monthly total | report only (d) | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 001 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 002 |
| Flow, total | monthly total | report only (Mgal) | all year | 002 |
| Duration of discharge | monthly total | report only (d) | all year | 002 |
Cited limits by parameter: South Dakota's rules and the federal ones.
Same industry: the 4 Water Supply permits in South Dakota.
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