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Sewage treatment plant, Bellingham, Washington. NPDES permit WA0023787 expired Oct 31, 2021; its limits still apply. Last 12 months: over a limit once (last November 2025), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Solids, suspended percent removal, monthly average minimum | 83 | ≥ 85 % | 13% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 6.75 lb/d | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 6.75 lb/d | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 6.75 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 6.75 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 lb/d | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 lb/d | Jul–Sep | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | average | ≤ 30 mg/L | Jul–Sep | 001 |
| Solids, total suspended | average | ≤ 30 mg/L | Jul–Sep | 001 |
| Solids, total suspended | average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | average | ≤ 6.75 lb/d | Jul–Sep | 001 |
| Solids, total suspended | average | ≤ 6.75 lb/d | Jul–Sep | 001 |
| Solids, total suspended | average | ≤ 6.75 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | average | ≤ 6.75 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 10 lb/d | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 10 lb/d | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 10 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 10 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Chlorine, total residual | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| Ultraviolet light transmittance | maximum | report only (%) (alert, not enforceable) | all year | 001 |
| Ultraviolet light transmittance | maximum | report only (%) (alert, not enforceable) | all year | 001 |
| Ultraviolet light transmittance | minimum | report only (%) (alert, not enforceable) | all year | 001 |
| Ultraviolet light transmittance | minimum | report only (%) (alert, not enforceable) | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 400 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 400 #/100mL | all year | 001 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | Jul–Sep | IN1 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | IN1 |
Cited limits by parameter: Washington's rules and the federal ones.
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