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Electric Services, major discharger, Hoyt Lakes, Minnesota. NPDES permit MN0000990, in force until Jun 30, 2031. Last 12 months: over a limit once (last July 2026), 28 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Temperature, water deg. fahrenheit, maximum daily average | 90.1632 | ≤ 89 deg F | 1% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 56 deg F | Feb | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 55 deg F | Jan | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 55 deg F | Dec | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 68 deg F | Oct | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 86 deg F | Aug | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 89 deg F | Jul | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 80 deg F | Sep | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 86 deg F | Jun | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 84 deg F | May | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 65 deg F | Apr | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 57 deg F | Mar | D020 |
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 55 deg F | Nov | D020 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | D020 |
| Plant capacity fact. percent of capacity | maximum daily average | report only (%) | all year | D020 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D020 |
| Nitrogen, total [as N] | annual average | report only (mg/L) | all year | D020 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) | all year | D020 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | all year | D020 |
| Phosphorus, total [as P] | annual average | report only (mg/L) | all year | D020 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | D020 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | D020 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D020 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D020 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D020 |
| Chlorine, total residual | daily maximum | ≤ .2 mg/L | all year | D020 |
| Chlorine, total residual | daily maximum | ≤ 8.6 kg/d | all year | D020 |
| Chlorination | daily maximum | ≤ 2 hr/d | all year | D020 |
| Mercury, dissolved [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D020 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D020 |
| Specific conductance | annual maximum | report only (umho/cm) | all year | D021 |
| pH | instantaneous minimum | ≥ 6 SU | all year | D021 |
| pH | instantaneous maximum | ≤ 9 SU | all year | D021 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D021 |
| Solids, total suspended | daily maximum | ≤ 83.2 mg/L | all year | D021 |
| Solids, total suspended | monthly average | ≤ 8.9 kg/d | all year | D021 |
| Solids, total suspended | daily maximum | ≤ 24.6 kg/d | all year | D021 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | D021 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | D021 |
| Oil and grease, hexane extr method | monthly average | ≤ 3 kg/d | all year | D021 |
| Oil and grease, hexane extr method | daily maximum | ≤ 4.4 kg/d | all year | D021 |
| Nitrogen, total [as N] | annual average | report only (mg/L) | all year | D021 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) | all year | D021 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | all year | D021 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | all year | D021 |
| Chloride [as Cl] | annual maximum | report only (mg/L) | all year | D021 |
| Sulfate, total [as SO4] | annual maximum | report only (mg/L) | all year | D021 |
| Fluoride, total [as F] | annual maximum | report only (ug/L) | all year | D021 |
| Boron, dissolved [as B] | annual maximum | report only (ug/L) | all year | D021 |
| Copper, total [as Cu] | annual maximum | report only (ug/L) | all year | D021 |
| Aluminum, total [as Al] | annual maximum | report only (ug/L) | all year | D021 |
| Selenium, total [as Se] | annual maximum | report only (ug/L) | all year | D021 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D021 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D021 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D021 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | D021 |
| Solids, total dissolved | annual maximum | report only (mg/L) | all year | D021 |
| Mercury, total [as Hg] | monthly average | ≤ 1.8 ng/L | all year | D021 |
| Mercury, total [as Hg] | daily maximum | ≤ 3.2 ng/L | all year | D021 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Apr, Oct | W033 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Apr, Oct | W033 |
| Specific conductance | monthly maximum | report only (umho/cm) | Apr, Oct | W033 |
| Sulfate [as S] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| pH | monthly minimum | report only (SU) | Apr, Oct | W033 |
| pH | monthly maximum | report only (SU) | Apr, Oct | W033 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Calcium, dissolved [as Ca] | monthly maximum | report only (mg/L) | Apr | W033 |
| Magnesium, dissolved [as Mg] | monthly maximum | report only (mg/L) | Apr | W033 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Apr | W033 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Boron, dissolved [as B] | monthly maximum | report only (ug/L) | Apr, Oct | W033 |
| Iron, dissolved [as Fe] | monthly maximum | report only (mg/L) | Apr | W033 |
| Manganese, dissolved [as Mn] | monthly maximum | report only (ug/L) | Apr | W033 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr, Oct | W033 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | Apr, Oct | W033 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Apr, Oct | W034 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Apr, Oct | W034 |
| Specific conductance | monthly maximum | report only (umho/cm) | Apr, Oct | W034 |
| Sulfate [as S] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| pH | monthly minimum | report only (SU) | Apr, Oct | W034 |
| pH | monthly maximum | report only (SU) | Apr, Oct | W034 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Calcium, dissolved [as Ca] | monthly maximum | report only (mg/L) | Apr | W034 |
| Magnesium, dissolved [as Mg] | monthly maximum | report only (mg/L) | Apr | W034 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Apr | W034 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Boron, dissolved [as B] | monthly maximum | report only (ug/L) | Apr, Oct | W034 |
| Iron, dissolved [as Fe] | monthly maximum | report only (mg/L) | Apr | W034 |
| Manganese, dissolved [as Mn] | monthly maximum | report only (ug/L) | Apr | W034 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr, Oct | W034 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | Apr, Oct | W034 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | W038 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | W040 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 12 Electric Services permits in Minnesota.
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