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Sewage treatment plant, major discharger, Forest Grove, Oregon. NPDES permit OR0020168, in force until Nov 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | May–Oct | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | May–Oct | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 25 deg C | May–Oct | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | May–Oct | 001 |
| Temperature, water deg. centigrade | maximum 7-day average | report only (deg C) | May–Oct | 001 |
| Temperature, water deg. centigrade | maximum 7-day average | report only (deg C) | May–Oct | 001 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 6 mg/L | May–Oct | 001 |
| Oxygen, dissolved [DO] | daily average minimum | report only (mg/L) | May–Oct | 001 |
| pH | daily minimum | ≥ 6.3 SU | all year | 001 |
| pH | daily minimum | report only (SU) | May–Oct | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| pH | daily maximum | report only (SU) | May–Oct | 001 |
| pH | monthly minimum | report only (SU) | all year | 001 |
| pH | monthly maximum | report only (SU) | all year | 001 |
| Solids, total suspended | monthly median | ≤ 10 mg/L | May–Oct | 001 |
| Solids, total suspended | monthly median | ≤ 10 mg/L | Jul–Sep | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 1600 lb/d | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 1600 lb/d | Jul–Sep | 001 |
| Solids, total suspended | monthly average | ≤ 2000 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | May–Oct | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | Jul–Sep | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | May–Oct | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly median | ≤ 10 mg/L | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | 7-day median | ≤ 20 mg/L | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 1600 lb/d | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | May–Oct | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 2000 lb/d | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | May–Oct | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | 7-day median | ≤ 20 mg/L | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | ≤ 2400 lb/d | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | ≤ 3000 lb/d | May, Jun, Oct, Nov | 001 |
| Solids, total suspended | 7-day median | ≤ 20 mg/L | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 2400 lb/d | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 3000 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | May–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | May–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | May–Oct | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly median | report only (mg/L) | May–Sep | 001 |
| Phosphorus, total [as P] | monthly median | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May–Oct | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May–Sep | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly median | ≤ 81.6 lb/d | May–Sep | 001 |
| Phosphorus, total [as P] | monthly median | report only (lb/d) | May–Sep | 001 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | May–Oct | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | maximum daily average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | May–Oct | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | maximum daily average | report only (MGD) | all year | 001 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 406 #/100mL | all year | 001 |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| E. coli | daily maximum | report only (MPN/100mL) | all year | 001 |
| Excess thermal load | daily maximum | ≤ 7 mkcal/day | May–Oct | 001 |
| Excess thermal load | maximum 7-day average | report only (mkcal/day) | May–Oct | 001 |
| Ultraviolet light dosage | daily minimum | report only (mJ/cm2) | all year | 001 |
| Ultraviolet light dosage | monthly average | report only (mJ/cm2) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly median | ≤ 10 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly median | ≤ 10 mg/L | Jul–Sep | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 500 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 500 lb/d | Jul–Sep | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1000 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1000 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1000 lb/d | Jul–Sep | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2000 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly median | ≤ 10 mg/L | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day median | ≤ 15 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 500 lb/d | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1000 lb/d | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1000 lb/d | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2000 lb/d | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day median | ≤ 15 mg/L | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 750 lb/d | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1500 lb/d | May, Jun, Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day median | ≤ 15 mg/L | Jul–Sep | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 750 lb/d | Jul–Sep | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1500 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | May–Oct | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | report only (%) | May–Oct | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | May–Oct | 003 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | May–Oct | 003 |
| Temperature, water deg. centigrade | maximum 7-day average | report only (deg C) | May–Oct | 003 |
| Oxygen, dissolved [DO] | daily average minimum | report only (mg/L) | May–Oct | 003 |
| pH | daily minimum | ≥ 6.3 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, Dec | 003 |
| Solids, total suspended | monthly average | ≤ 2000 lb/d | Jan, Feb, Mar, Apr, Dec | 003 |
| Solids, total suspended | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Dec | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May, Jun, Oct, Nov | 003 |
| Solids, total suspended | monthly average | ≤ 2000 lb/d | May, Jun, Oct, Nov | 003 |
| Solids, total suspended | daily maximum | report only (lb/d) | May, Jun, Oct, Nov | 003 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | May, Jun, Oct, Nov | 003 |
| Solids, total suspended | weekly average | ≤ 3000 lb/d | May, Jun, Oct, Nov | 003 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec | 003 |
| Solids, total suspended | weekly average | ≤ 3000 lb/d | Jan, Feb, Mar, Apr, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | May–Nov | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | May–Nov | 003 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly median | report only (mg/L) | May–Sep | 003 |
| Phosphorus, total [as P] | monthly median | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May–Sep | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Phosphorus, total [as P] | monthly median | report only (lb/d) | May–Sep | 003 |
| Duration | total | report only (hr/d) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | maximum daily average | report only (MGD) | all year | 003 |
| E. coli | geometric mean | ≤ 126 #/100mL | all year | 003 |
| E. coli | daily maximum | ≤ 406 #/100mL | all year | 003 |
| E. coli | geometric mean | ≤ 126 #/100mL | all year | 003 |
| E. coli | daily maximum | report only (#/100mL) | all year | 003 |
| Ultraviolet light dosage | daily minimum | report only (mJ/cm2) | all year | 003 |
| Ultraviolet light dosage | monthly average | report only (mJ/cm2) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1000 lb/d | Jan, Feb, Mar, Apr, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2000 lb/d | Jan, Feb, Mar, Apr, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | May, Jun, Oct, Nov | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1000 lb/d | May, Jun, Oct, Nov | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2000 lb/d | May, Jun, Oct, Nov | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | May, Jun, Oct, Nov | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1500 lb/d | May, Jun, Oct, Nov | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1500 lb/d | Jan, Feb, Mar, Apr, Dec | 003 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Dec | 003 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | May, Jun, Oct, Nov | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Dec | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | May, Jun, Oct, Nov | 003 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | May–Oct | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | May–Oct | 004 |
| Temperature, water deg. centigrade | maximum 7-day average | report only (deg C) | May–Oct | 004 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | May–Oct | 004 |
| pH | daily minimum | report only (SU) | all year | 004 |
| pH | daily maximum | report only (SU) | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | May–Oct | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Solids, total suspended | monthly average | report only (lb/d) | May–Oct | 004 |
| Solids, total suspended | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Solids, total suspended | daily maximum | report only (lb/d) | May–Oct | 004 |
| Solids, total suspended | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | weekly average | report only (lb/d) | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.4 mg/L | Jun–Oct | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.6 mg/L | Jun–Oct | 004 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | Jun–Oct | 004 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | May | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May | 004 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (lb/d) | May | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.8 mg/L | May | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32.9 mg/L | May | 004 |
| Nitrogen, ammonia total [as N] | 7-day median | report only (mg/d) | May | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | monthly median | report only (mg/L) | May–Sep | 004 |
| Phosphorus, total [as P] | monthly median | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May–Sep | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| Phosphorus, total [as P] | monthly median | report only (lb/d) | May–Sep | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | maximum daily average | report only (MGD) | all year | 004 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 004 |
| E. coli | daily maximum | ≤ 406 #/100mL | all year | 004 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 004 |
| E. coli | daily maximum | report only (#/100mL) | all year | 004 |
| Ultraviolet light dosage | daily minimum | report only (mJ/cm2) | all year | 004 |
| Ultraviolet light dosage | monthly average | report only (mJ/cm2) | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | May–Oct | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | May–Oct | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (lb/d) | May–Oct | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | all year | 004 |
| BOD, carbonaceous, percent removal | monthly average minimum | report only (%) | all year | 004 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year | 004 |
Cited limits by parameter: Oregon's rules and the federal ones.
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