Passage Data · Check a report · Use it from your AI
Sewage treatment plant, Tonasket, Washington. NPDES permit WA0052337, in force until Apr 30, 2031. Last 12 months: over a limit 8 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | BOD, percent removal [total], monthly average | 91 | ≤ 85 % | 40% |
| May 2026 | Solids, suspended percent removal, monthly average | 95 | ≤ 85 % | 67% |
| June 2026 | BOD, percent removal [total], monthly average | 86 | ≤ 85 % | 7% |
| June 2026 | Solids, suspended percent removal, monthly average | 91 | ≤ 85 % | 40% |
| July 2026 | BOD, percent removal [total], monthly average | 87 | ≤ 85 % | 13% |
| July 2026 | Solids, suspended percent removal, monthly average | 88 | ≤ 85 % | 20% |
| August 2026 | BOD, percent removal [total], monthly average | 90.5 | ≤ 85 % | 37% |
| August 2026 | Solids, suspended percent removal, monthly average | 90 | ≤ 85 % | 33% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 004 |
| Nitrite + Nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 004 |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 004 |
| E. coli | single reading | report only (#/100mL) (alert, not enforceable) | all year | 004 |
| Oil & grease, non-polar material | single reading | report only (mg/L) (alert, not enforceable) | all year | 004 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | 004 |
| Temperature, water deg. centigrade | maximum | report only (deg C) (alert, not enforceable) | all year | EFFL |
| Temperature, water deg. centigrade | monthly average | report only (deg C) (alert, not enforceable) | all year | EFFL |
| Oxygen, dissolved [DO] | single reading | report only (mg/L) (alert, not enforceable) | all year | EFFL |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | EFFL |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | EFFL |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | EFFL |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 102.6 lb/d | all year | EFFL |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | all year | EFFL |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 153.9 lb/d | all year | EFFL |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 153.9 lb/d | all year | EFFL |
| pH | daily minimum | ≥ 6 SU | all year | EFFL |
| pH | daily maximum | ≤ 9 SU | all year | EFFL |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | EFFL |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | all year | EFFL |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | EFFL |
| Solids, total suspended | monthly average | ≤ 102.6 lb/d | all year | EFFL |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | all year | EFFL |
| Solids, total suspended | weekly average | ≤ 153.9 lb/d | all year | EFFL |
| Solids, total suspended | weekly average | ≤ 153.9 lb/d | all year | EFFL |
| Nitrogen, ammonia total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | EFFL |
| Nitrogen, ammonia total [as N] | maximum | report only (lb/d) (alert, not enforceable) | all year | EFFL |
| BOD, percent removal [total] | monthly average | ≤ 85 % | all year | EFFL |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | EFFL |
| Coliform, fecal general | weekly geometric mean | ≤ 400 #/100mL | all year | EFFL |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | EFFL |
| Flow | monthly average | report only (MGD) (alert, not enforceable) | all year | EFFL |
| Flow | monthly total | report only (MGD) (alert, not enforceable) | all year | EFFL |
| Solids, suspended percent removal | monthly average | ≤ 85 % | all year | EFFL |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Temperature, water deg. centigrade | single reading | report only (deg C) (alert, not enforceable) | all year | MW1 |
| Conductivity | single reading | report only (umho/cm) (alert, not enforceable) | all year | MW1 |
| pH | single reading | report only (SU) (alert, not enforceable) | all year | MW1 |
| Nitrogen, nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW1 |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW1 |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW1 |
| Iron, ferrous - present | single reading | report only (N=0;Y=1) (alert, not enforceable) | all year | MW1 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | MW1 |
| Depth to water level ft below landsurface | single reading | report only (ft) (alert, not enforceable) | all year | MW1 |
| Temperature, water deg. centigrade | single reading | report only (deg C) (alert, not enforceable) | all year | MW3 |
| Conductivity | single reading | report only (umho/cm) (alert, not enforceable) | all year | MW3 |
| pH | single reading | report only (SU) (alert, not enforceable) | all year | MW3 |
| Nitrogen, nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW3 |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW3 |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW3 |
| Iron, ferrous - present | single reading | report only (N=0;Y=1) (alert, not enforceable) | all year | MW3 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | MW3 |
| Depth to water level ft below landsurface | single reading | report only (ft) (alert, not enforceable) | all year | MW3 |
| Temperature, water deg. centigrade | single reading | report only (deg C) (alert, not enforceable) | all year | MW6 |
| Conductivity | single reading | report only (umho/cm) (alert, not enforceable) | all year | MW6 |
| pH | single reading | report only (SU) (alert, not enforceable) | all year | MW6 |
| Nitrogen, nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW6 |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW6 |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | MW6 |
| Iron, ferrous - present | single reading | report only (N=0;Y=1) (alert, not enforceable) | all year | MW6 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | MW6 |
| Depth to water level ft below landsurface | single reading | report only (ft) (alert, not enforceable) | all year | MW6 |
Cited limits by parameter: Washington's rules and the federal ones.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/WA0052337 · MCP: https://passage-data.com/mcp