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Sewage treatment plant, major discharger, Bozeman, Montana. NPDES permit MT0022608 expired May 31, 2017; its limits still apply. Last 12 months: no values over a limit, 2 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | single grab sample | report only (deg C) | all year |
| Flow rate | daily average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| pH | single grab sample | report only (SU) | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 1083 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 2169 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | report only (mg/L) | all year |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jun–Sep |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | Jun–Sep |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Nitrogen, total [as N] | monthly average | ≤ 783 lb/d | Jun–Sep |
| Nitrogen, total [as N] | monthly average | ≤ 864 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Nitrogen, total [as N] | daily maximum | ≤ 971 lb/d | Jun–Sep |
| Nitrogen, total [as N] | daily maximum | ≤ 1072 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.52 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.15 mg/L | all year |
| Nitrogen, ammonia total [as N] | single grab sample | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | single grab sample | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jun–Sep |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Jun–Sep |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Phosphorus, total [as P] | monthly average | ≤ 160 lb/d | Jun–Sep |
| Phosphorus, total [as P] | monthly average | ≤ 170 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | ≤ 199 lb/d | Jun–Sep |
| Phosphorus, total [as P] | daily maximum | ≤ 211 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Cyanide, total [as CN] | value | report only (ug/L) | all year |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year |
| Arsenic, total recoverable | single grab sample | report only (ug/L) | all year |
| Arsenic, total recoverable | value | report only (ug/L) | all year |
| Selenium, total recoverable | single grab sample | report only (ug/L) | all year |
| Selenium, total recoverable | value | report only (ug/L) | all year |
| Thallium, total recoverable | value | report only (ug/L) | all year |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year |
| Nickel, total recoverable | value | report only (ug/L) | all year |
| Silver total recoverable | value | report only (ug/L) | all year |
| Zinc, total recoverable | value | report only (ug/L) | all year |
| Zinc, total recoverable | single grab sample | report only (ug/L) | all year |
| Cadmium, total recoverable | single grab sample | report only (ug/L) | all year |
| Cadmium, total recoverable | value | report only (ug/L) | all year |
| Lead, total recoverable | value | report only (ug/L) | all year |
| Chromium, total recoverable | value | report only (ug/L) | all year |
| Copper, total recoverable | single grab sample | report only (ug/L) | all year |
| Copper, total recoverable | value | report only (ug/L) | all year |
| Antimony, total recoverable | value | report only (ug/L) | all year |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 CFU/100mL | Apr–Oct |
| E. coli, MTEC-MF | weekly geometric mean | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| E. coli, MTEC-MF | weekly geometric mean | ≤ 252 CFU/100mL | Apr–Oct |
| Chloroform | single sample | report only (ug/L) | all year |
| Chlorodibromomethane | single sample | report only (ug/L) | all year |
| Methylene chloride | single sample | report only (ug/L) | all year |
| Di[2-ethylhexyl] phthalate [DEHP] | single sample | report only (ug/L) | all year |
| Phenols | value | report only (ug/L) | all year |
| Mercury, total recoverable | value | report only (ug/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1072 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1928 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year |
| BOD, carbonaceous, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| Oil and grease visual | value | report only (N=0;Y=1) | all year |
| Report due [yrmoda] | value | ≤ 1 abst=0;prst=1 | all year |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | Jan, Feb, Mar, Jul, Aug, Sep |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | Apr, May, Jun, Oct, Nov, Dec |
Cited limits by parameter: Montana'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/MT0022608 · MCP: https://passage-data.com/mcp