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Sewage treatment plant, major discharger, Centralia, Washington. NPDES permit WA0020982 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 44 required values missing, 30 of 77 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| November 2025 | 0000 | Fecal coliform, MPN, EC med, 44.5 C, weekly geometric mean | 778 | ≤ 400 #/100mL | 95% |
| December 2025 | 003 | Solids, total suspended, weekly average | 1484.39 | ≤ 1085 lb/d | 37% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | average | report only (deg C) (alert, not enforceable) | all year | 0000 |
| Temperature, water deg. centigrade | maximum | report only (deg C) (alert, not enforceable) | all year | 0000 |
| Oxygen, dissolved [DO] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Alkalinity, total [as CaCO3] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Oil and grease [soxhlet extr.] tot. | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Nitrogen, nitrate total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 0000 |
| Nitrogen, nitrate total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | 0000 |
| Nitrogen, Kjeldahl, total [as N] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Nitrite + Nitrate total [as N] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Phosphorus, total [as P] | average | report only (mg/L) (alert, not enforceable) | all year | 0000 |
| Phosphorus, total [as P] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Phosphorus, total [as P] | maximum | report only (mg/L) (alert, not enforceable) | all year | 0000 |
| Carbon, tot organic [TOC] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Hardness, total [as CaCO3] | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Chromium, hexavalent [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Thallium, total [as Tl] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | 0000 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | 0000 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | ≤ 400 #/100mL | all year | 0000 |
| Di[2-ethylhexyl] phthalate [DEHP] | average | report only (ug/L) (alert, not enforceable) | May, Nov | 0000 |
| Chlorine, total residual | single reading | report only (mg/L) (alert, not enforceable) | all year | 0000 |
| Chlorine, total residual | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| E. coli | average | report only (#/100mL) (alert, not enforceable) | all year | 0000 |
| E. coli | maximum | report only (#/100mL) (alert, not enforceable) | all year | 0000 |
| Ultraviolet light transmittance | average | report only (%) (alert, not enforceable) | all year | 0000 |
| Ultraviolet light transmittance | maximum | report only (%) (alert, not enforceable) | all year | 0000 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 0000 |
| pH, minimum | daily minimum | ≥ 6 SU | all year | 0000 |
| Solids, total dissolved | average | report only (mg/L) (alert, not enforceable) | May, Nov | 0000 |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | all year | 0000 |
| BOD, 5-day, 20 deg. C | average | ≤ 20 mg/L (alert, not enforceable) | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 20 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Solids, total suspended | average | ≤ 20 mg/L (alert, not enforceable) | all year | 001 |
| Solids, total suspended | average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | Apr–Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) (alert, not enforceable) | Apr–Nov | 001 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | Apr–Nov | 001 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) (alert, not enforceable) | Apr–Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Dec | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | weekly average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 20 mg/L (alert, not enforceable) | all year | 002 |
| BOD, 5-day, 20 deg. C | average | ≤ 20 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | all year | 002 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | all year | 002 |
| Solids, total suspended | average | ≤ 20 mg/L (alert, not enforceable) | all year | 002 |
| Solids, total suspended | average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | 002 |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | all year | 002 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Dec | 002 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | Apr–Nov | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) (alert, not enforceable) | Apr–Nov | 002 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Dec | 002 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | Apr–Nov | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) (alert, not enforceable) | Apr–Nov | 002 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 002 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 002 |
| Flow | weekly average | report only (MGD) (alert, not enforceable) | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | average | ≤ 660 lb/d | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 990 lb/d | all year | 003 |
| Solids, total suspended | average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | average | ≤ 750 lb/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 1085 lb/d | all year | 003 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 003 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) (alert, not enforceable) | all year | 003 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | all year | 003 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) (alert, not enforceable) | all year | 003 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 003 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 003 |
| Flow | weekly average | report only (MGD) (alert, not enforceable) | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Flow | average | report only (cfs) (alert, not enforceable) | all year | AMB |
| Flow | average | report only (cfs) (alert, not enforceable) | all year | AMB |
| Temperature, water deg. centigrade | average | report only (deg C) (alert, not enforceable) | all year | INF |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | all year | INF |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | all year | INF |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | all year | INF |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) (alert, not enforceable) | all year | INF |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Chromium, hexavalent [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Thallium, total [as Tl] | single reading | report only (mg/kg) (alert, not enforceable) | all year | INF |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| Di[2-ethylhexyl] phthalate [DEHP] | single reading | report only (ug/L) (alert, not enforceable) | all year | INF |
| pH, maximum | maximum | report only (SU) (alert, not enforceable) | all year | INF |
| pH, minimum | minimum | report only (SU) (alert, not enforceable) | all year | INF |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | all year | INF |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | INF |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Thallium, total [as Tl] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | SLUG |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | all year | SLUG |
Cited limits by parameter: Washington's rules and the federal ones.
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