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Sewage treatment plant, Oakland, Oregon. NPDES permit OR0020494 expired Jul 31, 2011; its limits still apply. Last 12 months: no values over a limit, 5 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Flow rate | daily average | report only (cfs) | Nov |
| Flow rate | weekly average | report only (cfs) | Nov |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 26 lb/d | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 58 lb/d | Nov |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 39 lb/d | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 58 lb/d | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 58 lb/d | Nov |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 87 lb/d | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 87 lb/d | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 58 lb/d | Nov |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 120 lb/d | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 58 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 120 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 58 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 87 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| pH | daily minimum | ≥ 6 SU | Jan, Feb, Mar, Apr, May, Nov, Dec |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Apr, May, Nov, Dec |
| pH | daily minimum | report only (SU) | all year |
| pH | daily maximum | report only (SU) | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Nov |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Nov |
| Solids, total suspended | weekly average | ≤ 26 lb/d | Nov |
| Solids, total suspended | monthly average | ≤ 58 lb/d | Nov |
| Solids, total suspended | daily maximum | ≤ 39 lb/d | Nov |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Nov |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Nov |
| Solids, total suspended | weekly average | ≤ 58 lb/d | Nov |
| Solids, total suspended | monthly average | ≤ 58 lb/d | Nov |
| Solids, total suspended | daily maximum | ≤ 87 lb/d | Nov |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Nov |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Nov |
| Solids, total suspended | weekly average | ≤ 87 lb/d | Nov |
| Solids, total suspended | monthly average | ≤ 58 lb/d | Nov |
| Solids, total suspended | daily maximum | ≤ 120 lb/d | Nov |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | monthly average | ≤ 58 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | daily maximum | ≤ 120 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | monthly average | ≤ 58 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| Solids, total suspended | weekly average | ≤ 87 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | Jan, Feb, Mar, Apr, May, Nov, Dec |
| E. coli | daily maximum | ≤ 406 #/100mL | Jan, Feb, Mar, Apr, May, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | Jan, Feb, Mar, Apr, May, Nov, Dec |
| E. coli | daily maximum | report only (#/100mL) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Flow, total | daily maximum | ≤ 0 gal | Jun–Oct |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Chlorine usage | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
Cited limits by parameter: Oregon's rules and the federal ones.
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