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Sewage treatment plant, Colton, Washington. NPDES permit WA0023175 expired May 31, 2020; its limits still apply. Last 12 months: over a limit 28 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 55.425 | ≤ 45 mg/L | 23% |
| January 2026 | BOD, 5-day, 20 deg. C, weekly average | 72 | ≤ 65 mg/L | 11% |
| January 2026 | BOD, percent removal [total], monthly average minimum | 64 | ≥ 65 % | 3% |
| January 2026 | Coliform, fecal general, maximum | 220 | ≤ 200 #/100mL | 10% |
| January 2026 | Solids, total suspended, weekly average | 75 | ≤ 65 mg/L | 15% |
| January 2026 | pH, daily maximum | 9.18 | ≤ 8.5 SU | — |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 50.6 | ≤ 45 mg/L | 12% |
| February 2026 | BOD, percent removal [total], monthly average minimum | 64 | ≥ 65 % | 3% |
| February 2026 | Solids, suspended percent removal, monthly average minimum | 17 | ≥ 65 % | 137% |
| February 2026 | Solids, total suspended, monthly average | 106 | ≤ 45 mg/L | 136% |
| February 2026 | Solids, total suspended, monthly average | 75.68 | ≤ 47 lb/d | 61% |
| February 2026 | Solids, total suspended, weekly average | 106 | ≤ 65 mg/L | 63% |
| February 2026 | Solids, total suspended, weekly average | 75.68 | ≤ 68 lb/d | 11% |
| February 2026 | pH, daily maximum | 9.12 | ≤ 8.5 SU | — |
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 45.525 | ≤ 45 mg/L | 1% |
| March 2026 | BOD, percent removal [total], monthly average minimum | 48 | ≥ 65 % | 49% |
| March 2026 | Solids, suspended percent removal, monthly average minimum | 25 | ≥ 65 % | 114% |
| March 2026 | Solids, total suspended, monthly average | 47.5 | ≤ 47 lb/d | 1% |
| March 2026 | Solids, total suspended, monthly average | 62 | ≤ 45 mg/L | 38% |
| March 2026 | Solids, total suspended, weekly average | 72 | ≤ 65 mg/L | 11% |
| March 2026 | pH, daily maximum | 9.07 | ≤ 8.5 SU | — |
| April 2026 | BOD, 5-day, 20 deg. C, monthly average | 50.7333 | ≤ 45 mg/L | 13% |
| April 2026 | BOD, percent removal [total], monthly average minimum | 44 | ≥ 65 % | 60% |
| April 2026 | Solids, suspended percent removal, monthly average minimum | 8 | ≥ 65 % | 163% |
| April 2026 | Solids, total suspended, monthly average | 47.1267 | ≤ 47 lb/d | 0% |
| April 2026 | Solids, total suspended, monthly average | 64.5667 | ≤ 45 mg/L | 43% |
| April 2026 | Solids, total suspended, weekly average | 73 | ≤ 65 mg/L | 12% |
| April 2026 | pH, daily maximum | 8.99 | ≤ 8.5 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | maximum | report only (SU) (alert, not enforceable) | May–Oct | 001 |
| pH | maximum | report only (SU) (alert, not enforceable) | May–Oct | 001 |
| pH | daily maximum | ≤ 8.5 SU | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | daily maximum | ≤ 8.5 SU | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | minimum | report only (SU) (alert, not enforceable) | May–Oct | 001 |
| pH | minimum | report only (SU) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 47 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 47 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | May–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 68 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 68 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chlorine, total residual | monthly average | ≤ .5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chlorine, total residual | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| Chlorine, total residual | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | 001 |
| BOD, percent removal [total] | monthly average | report only (%) (alert, not enforceable) | May–Oct | 001 |
| BOD, percent removal [total] | monthly average | report only (%) (alert, not enforceable) | May–Oct | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 65 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 65 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Coliform, fecal general | maximum | report only (#/100mL) (alert, not enforceable) | May–Oct | 001 |
| Coliform, fecal general | maximum | report only (#/100mL) (alert, not enforceable) | May–Oct | 001 |
| Coliform, fecal general | maximum | ≤ 200 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Coliform, fecal general | maximum | ≤ 200 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | May–Oct | 001 |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | May–Oct | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 100 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 100 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Flow | maximum | report only (gal/d) | all year | 001 |
| Flow | monthly average | report only (gal/d) | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, suspended percent removal | monthly average | report only (%) (alert, not enforceable) | May–Oct | 001 |
| Solids, suspended percent removal | monthly average | report only (%) (alert, not enforceable) | May–Oct | 001 |
| Chlorine, total residual | weekly average | ≤ .75 mg/L | all year | 001W |
| Chlorine, total residual | weekly average | ≤ .75 mg/L | all year | 001W |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | IN1 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | May–Oct | IN1 |
| Flow | maximum | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | all year | IN1 |
Cited limits by parameter: Washington's rules and the federal ones.
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