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Sewage treatment plant, Sheridan, Oregon. NPDES permit OR0020648, in force until Sep 30, 2028. Last 12 months: over a limit 8 times (last April 2026), 1 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 4.1 mg/L | ≤ 3.1 mg/L | 32% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 4.3 mg/L | ≤ 3.1 mg/L | 39% |
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 8.9 mg/L | ≤ 8 mg/L | 11% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 6.3 mg/L | ≤ 3.1 mg/L | 103% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 4.1 mg/L | ≤ 3.1 mg/L | 32% |
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 36.9 mg/L | ≤ 30 mg/L | 23% |
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 821 lb/d | ≤ 810 lb/d | 1% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 4.3 mg/L | ≤ 3.1 mg/L | 39% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | Jan, Feb, Mar, Apr, Nov, Dec |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jan, Feb, Mar, Apr, Nov, Dec |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jan, Feb, Mar, Apr, Nov, Dec |
| Temperature, water deg. centigrade | maximum 7-day average | report only (deg C) | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow rate | monthly maximum | report only (cfs) | Jan, Feb, Mar, Apr, Nov, Dec |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 810 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 1600 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 1200 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | daily minimum | ≥ 6.3 SU | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | daily maximum | ≤ 9 SU | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | monthly minimum | report only (SU) | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | monthly maximum | report only (SU) | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | monthly maximum | report only (SU) | Jan, Feb, Mar, Apr, Nov, Dec |
| Alkalinity, total [as CaCO3] | quarterly maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 50 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 1300 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 2700 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 75 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 2000 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 0 MGD | May–Oct |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec |
| Chlorine, total residual | monthly average | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec |
| E. coli | daily maximum | ≤ 406 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec |
| E. coli | daily maximum | report only (#/100mL) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | Jan, Feb, Mar, Apr, Nov, Dec |
| Chlorine usage | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
Cited limits by parameter: Oregon's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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