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Sewage treatment plant, Coquille, Oregon. NPDES permit OR0026247, in force until Jul 31, 2029. Last 12 months: over a limit 4 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 6.24 lb/d | ≤ 4.4 lb/d | 42% |
| October 2025 | Nitrogen, total [as N], monthly average | 49.7 lb/d | ≤ 44 lb/d | 13% |
| July 2026 | Phosphorus, total [as P], monthly average | 21.9 lb/d | ≤ 3.5 lb/d | 526% |
| August 2026 | Phosphorus, total [as P], monthly average | 4.95 lb/d | ≤ 3.5 lb/d | 41% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Temperature, water deg. centigrade | maximum 7-day average | report only (deg C) | all year |
| Flow rate | monthly average | report only (cfs) | May–Oct |
| Flow rate | daily average | report only (cfs) | May–Oct |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | monthly average | report only (SU) | all year |
| pH | monthly maximum | report only (SU) | all year |
| Alkalinity, total [as CaCO3] | quarterly maximum | report only (mg/L) | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Oct |
| Solids, total suspended | monthly average | ≤ 510 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 88 lb/d | May–Oct |
| Solids, total suspended | daily maximum | ≤ 1020 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 180 lb/d | May–Oct |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 30 mg/L | May–Oct |
| Solids, total suspended | weekly average | ≤ 770 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 130 lb/d | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | May, Jun |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May, Jun |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep |
| Nitrogen, total [as N] | monthly average | ≤ 100 lb/d | May, Jun |
| Nitrogen, total [as N] | monthly average | ≤ 44 lb/d | Jul–Sep |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | May, Jun |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Jul–Sep |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Oct |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Oct |
| Nitrogen, total [as N] | monthly average | ≤ 44 lb/d | Oct |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Oct |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Oct |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Oct |
| Nitrogen, total [as N] | monthly average | ≤ 100 lb/d | Oct |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | May, Jun |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jul–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May, Jun |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jul–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20 lb/d | May, Jun |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.4 lb/d | Jul–Sep |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.4 lb/d | Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20 lb/d | Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | May, Jun |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul–Sep |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May, Jun |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul–Sep |
| Phosphorus, total [as P] | monthly average | ≤ 41 lb/d | May, Jun |
| Phosphorus, total [as P] | monthly average | ≤ 3.5 lb/d | Jul–Sep |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | May, Jun |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Jul–Sep |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Oct |
| Phosphorus, total [as P] | monthly average | ≤ 3.5 lb/d | Oct |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Oct |
| Phosphorus, total [as P] | monthly average | ≤ 41 lb/d | Oct |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Oct |
| 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 |
| 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 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | ≤ 406 #/100mL | all year |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | report only (#/100mL) | all year |
| Excess thermal load | maximum 7-day average | ≤ 17.1 mkcal/day | Oct |
| Excess thermal load | maximum 7-day average | ≤ 157.3 mkcal/day | May |
| Excess thermal load | maximum 7-day average | ≤ 107.1 mkcal/day | Jun |
| Excess thermal load | maximum 7-day average | ≤ 48.5 mkcal/day | Jul |
| Excess thermal load | maximum 7-day average | ≤ 23.7 mkcal/day | Aug |
| Excess thermal load | maximum 7-day average | ≤ 18 mkcal/day | Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May, Jun |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 430 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 55 lb/d | May, Jun |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 44 lb/d | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 860 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 110 lb/d | May, Jun |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 110 lb/d | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 44 lb/d | Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 110 lb/d | Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 55 lb/d | Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 110 lb/d | Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 650 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 83 lb/d | May–Oct |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
Cited limits by parameter: Oregon's rules and the federal ones.
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