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Sewage treatment plant, major discharger, Conneaut Lake, Pennsylvania. NPDES permit PA0021598, in force until Jul 31, 2028. Last 12 months: over a limit 7 times (last June 2026), 40 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 14.4 mg/L | ≤ 4.5 mg/L | 220% |
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 56 | ≤ 41.2 lb/d | 36% |
| April 2026 | Coliform, fecal general, instantaneous maximum | < 12100 #/100mL | ≤ 10000 #/100mL | 21% |
| May 2026 | Coliform, fecal general, geometric mean | 786 #/100mL | ≤ 200 #/100mL | 293% |
| May 2026 | Coliform, fecal general, instantaneous maximum | > 2420 #/100mL | ≤ 1000 #/100mL | — |
| June 2026 | Coliform, fecal general, geometric mean | 242 #/100mL | ≤ 200 #/100mL | 21% |
| June 2026 | Coliform, fecal general, instantaneous maximum | 2420 #/100mL | ≤ 1000 #/100mL | 142% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | 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 | ≤ 275 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 413 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 41.2 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.7 lb/d | May–Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Arsenic, total [as As] | quarterly average | report only (ug/L) | all year |
| Arsenic, total [as As] | quarterly average | report only (lb/d) | all year |
| Chromium, hexavalent [as Cr] | monthly average | ≤ 17.5 ug/L | all year |
| Chromium, hexavalent [as Cr] | weekly average | ≤ 27.3 ug/L | all year |
| Chromium, hexavalent [as Cr] | monthly average | ≤ .16 lb/d | all year |
| Chromium, hexavalent [as Cr] | weekly average | ≤ .25 lb/d | all year |
| Copper, total [as Cu] | monthly average | ≤ 24.9 ug/L | all year |
| Copper, total [as Cu] | weekly average | ≤ 38.8 ug/L | all year |
| Copper, total [as Cu] | monthly average | ≤ .23 lb/d | all year |
| Copper, total [as Cu] | weekly average | ≤ .36 lb/d | all year |
| Iron, total [as Fe] | quarterly average | report only (ug/L) | all year |
| Iron, total [as Fe] | quarterly average | report only (lb/d) | all year |
| Iron, dissolved [as Fe] | quarterly average | report only (ug/L) | all year |
| Iron, dissolved [as Fe] | quarterly average | report only (lb/d) | all year |
| Zinc, total [as Zn] | quarterly average | report only (ug/L) | all year |
| Zinc, total [as Zn] | quarterly average | report only (lb/d) | all year |
| Aluminum, total [as Al] | quarterly average | report only (ug/L) | all year |
| Aluminum, total [as Al] | quarterly average | report only (lb/d) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .35 mg/L | all year |
| E. coli | instantaneous maximum | report only (#/100mL) | all year |
| Cyanide, free available | monthly average | ≤ 9.4 ug/L | all year |
| Cyanide, free available | weekly average | ≤ 14.7 ug/L | all year |
| Cyanide, free available | monthly average | ≤ .086 lb/d | all year |
| Cyanide, free available | weekly average | ≤ .13 lb/d | all year |
| Coliform, fecal general | geometric mean | ≤ 2000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Sep |
| Coliform, fecal general | instantaneous maximum | ≤ 10000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 23 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 229 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 138 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 367 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 211 lb/d | May–Oct |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| BOD, carbonaceous [5 day, 20 C], monthly average | 5 mg/L | tighter | 6.24 mg/L (9 values, 1 below detection) | 1.25× |
| BOD, carbonaceous [5 day, 20 C], weekly average | 7.5 mg/L | tighter | 7.6 mg/L (9 values, 1 below detection) | 1.01× |
| BOD, carbonaceous [5 day, 20 C], monthly average | 45.8 lb/d | tighter | 27 lb/d (9 values, 1 below detection) | 0.59× |
| BOD, carbonaceous [5 day, 20 C], weekly average | 71.5 lb/d | tighter | 44 lb/d (9 values, 1 below detection) | 0.615× |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
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