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Sewage treatment plant, Richardton, North Dakota. NPDES permit ND0020109, in force until Mar 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 25 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year |
| Cyanide, total [as CN] | weekly average | report only (ug/L) | all year |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | weekly average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year |
| Arsenic, total [as As] | weekly average | report only (ug/L) | all year |
| Arsenic, total [as As] | monthly average | report only (ug/L) | all year |
| Beryllium, total [as Be] | daily maximum | report only (ug/L) | all year |
| Beryllium, total [as Be] | weekly average | report only (ug/L) | all year |
| Beryllium, total [as Be] | monthly average | report only (ug/L) | all year |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year |
| Cadmium, total [as Cd] | weekly average | report only (ug/L) | all year |
| Cadmium, total [as Cd] | monthly average | report only (ug/L) | all year |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year |
| Chromium, total [as Cr] | weekly average | report only (ug/L) | all year |
| Chromium, total [as Cr] | monthly average | report only (ug/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | weekly average | report only (ug/L) | all year |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year |
| Lead, total [as Pb] | weekly average | report only (ug/L) | all year |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year |
| Thallium, total [as Tl] | daily maximum | report only (ug/L) | all year |
| Thallium, total [as Tl] | weekly average | report only (ug/L) | all year |
| Thallium, total [as Tl] | monthly average | report only (ug/L) | all year |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year |
| Nickel, total [as Ni] | weekly average | report only (ug/L) | all year |
| Nickel, total [as Ni] | monthly average | report only (ug/L) | all year |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year |
| Silver, total [as Ag] | weekly average | report only (ug/L) | all year |
| Silver, total [as Ag] | monthly average | report only (ug/L) | all year |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year |
| Zinc, total [as Zn] | weekly average | report only (ug/L) | all year |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year |
| Antimony, total [as Sb] | daily maximum | report only (ug/L) | all year |
| Antimony, total [as Sb] | weekly average | report only (ug/L) | all year |
| Antimony, total [as Sb] | monthly average | report only (ug/L) | all year |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year |
| Selenium, total [as Se] | weekly average | report only (ug/L) | all year |
| Selenium, total [as Se] | monthly average | report only (ug/L) | all year |
| Total phenols | daily maximum | report only (ug/L) | all year |
| Total phenols | weekly average | report only (ug/L) | all year |
| Total phenols | monthly average | report only (ug/L) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year |
| Mercury, total [as Hg] | weekly average | report only (ug/L) | all year |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year |
| Oil and grease visual | total | report only (N=0;Y=1) | all year |
Cited limits by parameter: North Dakota'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/ND0020109 · MCP: https://passage-data.com/mcp