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Sewage treatment plant, Spring Valley, Minnesota. NPDES permit MN0051934, in force until Aug 31, 2028. Last 12 months: over a limit 8 times (last August 2026), 3 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 4.81 | ≤ 4 mg/L | 20% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 2.09 | ≤ 1 mg/L | 109% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 6.74 | ≤ 4 kg/d | 69% |
| July 2026 | Solids, suspended percent removal, monthly average minimum | 75 | ≥ 85 % | 67% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 2.32 | ≤ 1 mg/L | 132% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 4.65 | ≤ 4 kg/d | 16% |
| August 2026 | Oxygen, dissolved [DO], monthly minimum | 6.3 | ≥ 7 mg/L | 10% |
| August 2026 | Solids, suspended percent removal, monthly average minimum | 55 | ≥ 85 % | 200% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 7 mg/L | all year | D011 |
| pH | monthly minimum | ≥ 6 SU | all year | D011 |
| pH | monthly maximum | ≤ 9 SU | all year | D011 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D011 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jul | D011 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D011 |
| Solids, total suspended | monthly average | ≤ 106.1 kg/d | all year | D011 |
| Solids, total suspended | maximum weekly average | ≤ 159.2 kg/d | all year | D011 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Apr, May, Oct, Nov | D011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jun–Sep | D011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8 mg/L | Jan, Feb, Mar, Dec | D011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 14 kg/d | Apr, May, Oct, Nov | D011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 kg/d | Jun–Sep | D011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 28 kg/d | Jan, Feb, Mar, Dec | D011 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D011 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D011 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D011 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D011 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | D011 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Mar, Sep | D011 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D011 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D011 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D011 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D011 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | Jul | D011 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | Jul | D011 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | all year | D011 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 25 mg/L | all year | D011 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 53.1 kg/d | all year | D011 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 88.5 kg/d | all year | D011 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D011 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D011 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S012 |
| pH | monthly minimum | report only (SU) | all year | S012 |
| pH | monthly maximum | report only (SU) | all year | S012 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S012 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S012 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S012 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S012 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S012 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S012 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S012 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S012 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S012 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S012 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S012 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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