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Sewage treatment plant, Toppenish, Washington. NPDES permit WA0026123, in force until Dec 31, 2030. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Temperature, water deg. centigrade, daily maximum | 24 deg C | ≤ 23.5 deg C | 2% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Temperature, water deg. centigrade | daily maximum | ≤ 23.5 deg C | May–Sep |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Nov, Dec |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Nov, Dec |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | monthly average | ≤ 48 lb/d | Mar–Oct |
| Oxygen, dissolved [DO] | weekly average | ≤ 82 lb/d | Mar–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 418 lb/d | all year |
| BOD, 5-day, 20 deg. C | statistic code WL | ≤ 627 lb/d | all year |
| pH | instantaneous minimum | ≥ 6.5 SU | all year |
| pH | instantaneous maximum | ≤ 8.5 SU | all year |
| Alkalinity, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 418 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 627 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.35 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.35 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.22 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.23 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21.5 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21.5 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 86.6 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 72.8 lb/d | May–Sep |
| Nitrogen, nitrite total [as N] | monthly average | ≤ 10.5 mg/L | all year |
| Nitrogen, nitrite total [as N] | weekly average | ≤ 17.3 mg/L | all year |
| Nitrogen, nitrite total [as N] | monthly average | ≤ 146 lb/d | all year |
| Nitrogen, nitrite total [as N] | weekly average | ≤ 241 lb/d | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Arsenic, total [as As] | annual average | report only (ug/L) | all year |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year |
| Lead, total [as Pb] | monthly average | ≤ 2.28 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Lead, total [as Pb] | monthly average | ≤ 3.81 ug/L | May–Sep |
| Lead, total [as Pb] | daily maximum | ≤ 6.18 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Lead, total [as Pb] | daily maximum | ≤ 10.3 ug/L | May–Sep |
| Lead, total [as Pb] | monthly average | ≤ .0317 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Lead, total [as Pb] | monthly average | ≤ .0531 lb/d | May–Sep |
| Lead, total [as Pb] | daily maximum | ≤ .0861 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Lead, total [as Pb] | daily maximum | ≤ .143 lb/d | May–Sep |
| Silver, total [as Ag] | monthly average | ≤ 2.47 ug/L | May–Sep |
| Silver, total [as Ag] | monthly average | ≤ 3.38 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Silver, total [as Ag] | daily maximum | ≤ 5.97 ug/L | May–Sep |
| Silver, total [as Ag] | daily maximum | ≤ 4.93 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Silver, total [as Ag] | monthly average | ≤ .034 lb/d | May–Sep |
| Silver, total [as Ag] | monthly average | ≤ .047 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Silver, total [as Ag] | daily maximum | ≤ .083 lb/d | May–Sep |
| Silver, total [as Ag] | daily maximum | ≤ .069 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Zinc, total [as Zn] | monthly average | ≤ 55.54 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Zinc, total [as Zn] | monthly average | ≤ 63.14 ug/L | May–Sep |
| Zinc, total [as Zn] | daily maximum | ≤ 116.6 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Zinc, total [as Zn] | daily maximum | ≤ 123.2 ug/L | May–Sep |
| Zinc, total [as Zn] | monthly average | ≤ .883 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Zinc, total [as Zn] | monthly average | ≤ .883 lb/d | May–Sep |
| Zinc, total [as Zn] | daily maximum | ≤ 1.628 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Zinc, total [as Zn] | daily maximum | ≤ 1.716 lb/d | May–Sep |
| Copper, total recoverable | monthly average | ≤ 10.34 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Copper, total recoverable | monthly average | ≤ 9.71 ug/L | May–Sep |
| Copper, total recoverable | daily maximum | ≤ 17.38 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Copper, total recoverable | daily maximum | ≤ 16.3 ug/L | May–Sep |
| Copper, total recoverable | monthly average | ≤ .143 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Copper, total recoverable | monthly average | ≤ .14 lb/d | May–Sep |
| Copper, total recoverable | daily maximum | ≤ .242 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Copper, total recoverable | daily maximum | ≤ .23 lb/d | May–Sep |
| Selenium, total [as Se] | monthly average | ≤ 4.24 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Selenium, total [as Se] | monthly average | ≤ 7.08 ug/L | May–Sep |
| Selenium, total [as Se] | daily maximum | ≤ 11.5 ug/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Selenium, total [as Se] | daily maximum | ≤ 19.2 ug/L | May–Sep |
| Selenium, total [as Se] | monthly average | ≤ .0591 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Selenium, total [as Se] | monthly average | ≤ .0986 lb/d | May–Sep |
| Selenium, total [as Se] | daily maximum | ≤ .16 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Selenium, total [as Se] | daily maximum | ≤ .267 lb/d | May–Sep |
| E. coli, MTEC-MF | geometric mean | ≤ 100 CFU/100mL | all year |
| E. coli, MTEC-MF | instantaneous maximum | ≤ 320 CFU/100mL | 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 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | annual average | report only (ng/L) | all year |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year |
| PER-AND POLYFLUOROALKYL SUBSTANCES | annual average | report only (ng/L) | all year |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year |
| PER-AND POLYFLUOROALKYL SUBSTANCES | annual average | report only (mg/kg) | all year |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (mg/kg) | all year |
| Solids, total dissolved | monthly average | report only (mg/L) | all year |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
Cited limits by parameter: Washington's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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