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Sewage treatment plant, major discharger, Duluth, Minnesota. NPDES permit MN0049786, in force until Apr 30, 2028. Last 12 months: over a limit 5 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Mercury, total [as Hg], daily maximum | 10.5 | ≤ 6.5 ng/L | 62% |
| March 2026 | 2,3,7,8-Tetrachlorodibenzo-p-dioxin, quarterly average | 1.063585 | ≤ .0008 mg/d | — |
| March 2026 | 2,3,7,8-Tetrachlorodibenzo-p-dioxin, quarterly maximum | 1.079482 | ≤ .0014 mg/d | — |
| March 2026 | Polychlorinated biphenyls [PCBs], quarterly average | 21271.7 | ≤ 6.41 mg/d | — |
| March 2026 | Polychlorinated biphenyls [PCBs], quarterly maximum | 21589.64 | ≤ 11.17 mg/d | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly minimum | report only (deg C) | all year | D665 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | D665 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D665 |
| pH | monthly minimum | ≥ 6 SU | all year | D665 |
| pH | monthly maximum | ≤ 9 SU | all year | D665 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D665 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D665 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | D665 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D665 |
| Solids, total suspended | monthly average | ≤ 5500 kg/d | all year | D665 |
| Solids, total suspended | maximum weekly average | ≤ 8233 kg/d | all year | D665 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D665 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D665 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D665 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D665 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D665 |
| Phosphorus, total [as P] | monthly average | ≤ 115 kg/d | all year | D665 |
| Chloride [as Cl] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D665 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | D665 |
| Copper, total [as Cu] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | D665 |
| Halogens, adsorbable organic | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D665 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | Apr–Oct | D665 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | quarterly average | ≤ .0043 pg/L | Mar, Jun, Sep, Dec | D665 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | quarterly maximum | ≤ .0075 pg/L | Mar, Jun, Sep, Dec | D665 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | quarterly average | ≤ .0008 mg/d | Mar, Jun, Sep, Dec | D665 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | quarterly maximum | ≤ .0014 mg/d | Mar, Jun, Sep, Dec | D665 |
| 4,4'-DDT | monthly maximum | report only (ng/L) | Mar, Sep | D665 |
| Dieldrin | monthly maximum | report only (ng/L) | Mar, Sep | D665 |
| Toxaphene | monthly maximum | report only (ng/L) | Mar, Sep | D665 |
| Heptachlor | monthly maximum | report only (ng/L) | Mar, Sep | D665 |
| Polychlorinated biphenyls [PCBs] | quarterly average | ≤ .035 ng/L | Mar, Jun, Sep, Dec | D665 |
| Polychlorinated biphenyls [PCBs] | quarterly maximum | ≤ .061 ng/L | Mar, Jun, Sep, Dec | D665 |
| Polychlorinated biphenyls [PCBs] | quarterly average | ≤ 6.41 mg/d | Mar, Jun, Sep, Dec | D665 |
| Polychlorinated biphenyls [PCBs] | quarterly maximum | ≤ 11.17 mg/d | Mar, Jun, Sep, Dec | D665 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | report only (#/100mL) | Jan, Feb, Mar, Nov, Dec | D665 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D665 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D665 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D665 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D665 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | D665 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D665 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D665 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | all year | D665 |
| Mercury, total [as Hg] | monthly average | ≤ 5.2 ng/L | all year | D665 |
| Mercury, total [as Hg] | daily maximum | ≤ 6.5 ng/L | all year | D665 |
| Mercury, total [as Hg] | monthly average | ≤ 953 mg/d | all year | D665 |
| Mercury, total [as Hg] | daily maximum | ≤ 1191 mg/d | all year | D665 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D665 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D665 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4580 kg/d | all year | D665 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 7318 kg/d | all year | D665 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D665 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D665 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | S670 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | S670 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S670 |
| pH | monthly minimum | report only (SU) | all year | S670 |
| pH | monthly maximum | report only (SU) | all year | S670 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S670 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S670 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S670 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S670 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S670 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S670 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S670 |
| Halogens, adsorbable organic | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | S670 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | quarterly maximum | report only (pg/L) | Mar, Jun, Sep, Dec | S670 |
| Polychlorinated biphenyls [PCBs] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | S670 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S670 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S670 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S670 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | S670 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | S670 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S670 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S670 |
| Coliform, fecal MPN + membrane ftl 44.5 C | instantaneous maximum | report only (#/100mL) | Jan, Feb, Mar, Nov, Dec | W667 |
| Coliform, fecal MPN + membrane ftl 44.5 C | instantaneous maximum | report only (#/100mL) | Jan, Feb, Mar, Nov, Dec | W669 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MN0049786 · MCP: https://passage-data.com/mcp