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Sewage treatment plant, major discharger, Kennett Square, Pennsylvania. NPDES permit PA0024058, in force until Feb 28, 2027. Last 12 months: over a limit 45 times (last June 2026), 78 required values missing, 3 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Coliform, fecal general, geometric mean | 940.8 CFU/100mL | ≤ 200 CFU/100mL | 370% |
| October 2025 | Coliform, fecal general, instantaneous maximum | 68670 CFU/100mL | ≤ 1000 CFU/100mL | 6767% |
| October 2025 | Nitrogen, total [as N], daily maximum | 37.16 mg/L | ≤ 20 mg/L | 86% |
| October 2025 | Nitrogen, total [as N], monthly average | 161.65 | ≤ 91.8 lb/d | 76% |
| October 2025 | Nitrogen, total [as N], monthly average | 37.16 mg/L | ≤ 10 mg/L | 272% |
| October 2025 | Solids, total suspended, monthly average | 6150.11 | ≤ 275 lb/d | 2136% |
| October 2025 | Solids, total suspended, monthly average | < 1413.56 mg/L | ≤ 30 mg/L | 4612% |
| October 2025 | Solids, total suspended, weekly average | 6150.11 | ≤ 412 lb/d | 1393% |
| October 2025 | Solids, total suspended, weekly average | < 1413.56 mg/L | ≤ 45 mg/L | 3041% |
| November 2025 | Zinc, total [as Zn], daily maximum | .5 mg/L | ≤ .204 mg/L | 145% |
| November 2025 | Zinc, total [as Zn], daily maximum | 2.38 | ≤ 1.87 lb/d | 27% |
| November 2025 | Zinc, total [as Zn], monthly average | .277 mg/L | ≤ .131 mg/L | 111% |
| November 2025 | Zinc, total [as Zn], monthly average | 1.3 | ≤ 1.2 lb/d | 8% |
| December 2025 | Copper, total [as Cu], daily maximum | .0325 mg/L | ≤ .0239 mg/L | 36% |
| December 2025 | Copper, total [as Cu], monthly average | .0325 mg/L | ≤ .0153 mg/L | 112% |
| December 2025 | Copper, total [as Cu], monthly average | .17 | ≤ .14 lb/d | 21% |
| December 2025 | Nitrogen, total [as N], monthly average | < 14.85 mg/L | ≤ 10 mg/L | 48% |
| January 2026 | Copper, total [as Cu], daily maximum | .055 mg/L | ≤ .0239 mg/L | 130% |
| January 2026 | Copper, total [as Cu], daily maximum | .284 | ≤ .22 lb/d | 29% |
| January 2026 | Copper, total [as Cu], monthly average | .055 mg/L | ≤ .0153 mg/L | 259% |
| January 2026 | Copper, total [as Cu], monthly average | .284 | ≤ .14 lb/d | 103% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 8.07 mg/L | ≤ 6 mg/L | 35% |
| January 2026 | Nitrogen, total [as N], monthly average | < 16.14 mg/L | ≤ 10 mg/L | 61% |
| January 2026 | Phosphorus, total [as P], monthly average | 2.82 mg/L | ≤ 2 mg/L | 41% |
| January 2026 | Zinc, total [as Zn], daily maximum | .319 mg/L | ≤ .204 mg/L | 56% |
| January 2026 | Zinc, total [as Zn], monthly average | .319 mg/L | ≤ .131 mg/L | 144% |
| January 2026 | Zinc, total [as Zn], monthly average | 1.65 | ≤ 1.2 lb/d | 38% |
| February 2026 | Nitrogen, total [as N], monthly average | < 12.27 mg/L | ≤ 10 mg/L | 23% |
| March 2026 | Nitrogen, total [as N], monthly average | 93.88 | ≤ 91.8 lb/d | 2% |
| March 2026 | Nitrogen, total [as N], monthly average | < 15.08 mg/L | ≤ 10 mg/L | 51% |
| April 2026 | Coliform, fecal general, instantaneous maximum | 1299.7 CFU/100mL | ≤ 1000 CFU/100mL | 30% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 16.19 mg/L | ≤ 6 mg/L | 170% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 91.04 | ≤ 55 lb/d | 66% |
| April 2026 | Nitrogen, total [as N], daily maximum | 32.57 mg/L | ≤ 20 mg/L | 63% |
| April 2026 | Nitrogen, total [as N], monthly average | 183.14 | ≤ 91.8 lb/d | 99% |
| April 2026 | Nitrogen, total [as N], monthly average | 32.57 mg/L | ≤ 10 mg/L | 226% |
| April 2026 | Phosphorus, total [as P], monthly average | 19.89 | ≤ 12 lb/d | 66% |
| April 2026 | Phosphorus, total [as P], monthly average | 3.54 mg/L | ≤ 1.3 mg/L | 172% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 48 | ≤ 18 lb/d | 167% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 8.6 mg/L | ≤ 2 mg/L | 330% |
| May 2026 | Nitrogen, total [as N], monthly average | 13 mg/L | ≤ 10 mg/L | 30% |
| May 2026 | Phosphorus, total [as P], monthly average | 20 | ≤ 12 lb/d | 67% |
| May 2026 | Phosphorus, total [as P], monthly average | 3.5 mg/L | ≤ 1.3 mg/L | 169% |
| June 2026 | Phosphorus, total [as P], monthly average | 12.48 | ≤ 12 lb/d | 4% |
| June 2026 | Phosphorus, total [as P], monthly average | 2.33 mg/L | ≤ 1.3 mg/L | 79% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 275 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 412 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | ≤ 20 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | ≤ 91.8 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 18 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 55 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1.3 mg/L | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 2 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 12 lb/d | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 18 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Cadmium, total [as Cd] | monthly average | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | monthly average | ≤ .0153 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .0239 mg/L | all year | 001 |
| Copper, total [as Cu] | monthly average | ≤ .14 lb/d | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .22 lb/d | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | quarterly average | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ .131 mg/L | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ .204 mg/L | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 1.2 lb/d | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 1.87 lb/d | all year | 001 |
| Aluminum, total [as Al] | quarterly average | report only (mg/L) | all year | 001 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ .023 mg/L | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ .046 mg/L | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ .21 lb/d | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ .42 lb/d | all year | 001 |
| 2,4-Dinitrophenol | quarterly average | report only (mg/L) | all year | 001 |
| 2,4-Dinitrophenol | daily maximum | report only (mg/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | daily maximum | report only (mg/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | quarterly average | report only (mg/L) | all year | 001 |
| 4,6-Dinitro-o-cresol | daily maximum | report only (mg/L) | all year | 001 |
| 4,6-Dinitro-o-cresol | quarterly average | report only (mg/L) | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (mg/L) | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | quarterly average | report only (mg/L) | all year | 001 |
| Benzidine | daily maximum | report only (mg/L) | all year | 001 |
| Benzidine | quarterly average | report only (mg/L) | all year | 001 |
| Hexachlorobutadiene | daily maximum | report only (mg/L) | all year | 001 |
| Hexachlorobutadiene | quarterly average | report only (mg/L) | all year | 001 |
| Ultraviolet light intensity | monthly average | report only (mW/cm2) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| E. coli | monthly average | report only (#/100mL) | all year | 001 |
| Cyanide, free available | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, free available | quarterly average | report only (mg/L) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox chronic) | all year | 001 |
| Solids, total dissolved | quarterly average | report only (mg/L) | all year | 001 |
| Coliform, fecal general | geometric mean | ≤ 200 CFU/100mL | all year | 001 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 CFU/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 17 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 230 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 152 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 365 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 228 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | all year | 001 |
| TU Static 7Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 001 |
| Static 7Day Chronic Pimephales Promelas | daily maximum | report only (tox chronic) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | annual average | report only (mg/L) | all year | 002 |
| pH | annual average | report only (SU) | all year | 002 |
| Solids, total suspended | annual average | report only (mg/L) | all year | 002 |
| Oil & Grease | annual average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | annual average | report only (mg/L) | all year | 002 |
| Iron, dissolved [as Fe] | annual average | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | annual average | report only (mg/L) | all year | 002 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
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