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Sewage treatment plant, major discharger, Slippery Rock, Pennsylvania. NPDES permit PA0025569, in force until Nov 30, 2028. Last 12 months: over a limit once (last April 2026), 72 required values missing, 1 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Oxygen, dissolved [DO], instantaneous minimum | 4.89 mg/L | ≥ 6 mg/L | 19% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 4 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 | monthly 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 | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 300 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 450 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.4 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 94 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 250 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Ultraviolet light intensity | daily maximum | 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 | instantaneous maximum | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | monthly average | ≤ 200 #/100mL | May–Sep | 001 |
| Coliform, fecal general | monthly average | ≤ 2000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | May–Sep | 001 |
| Coliform, fecal general | instantaneous maximum | ≤ 10000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 250 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 400 lb/d | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | instantaneous maximum | ≤ 60 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 300 lb/d | all year | 002 |
| Solids, total suspended | instantaneous maximum | ≤ 600 lb/d | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | instantaneous maximum | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | ≤ 2.4 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | ≤ 7.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 36 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | ≤ 24 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | ≤ 72 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | instantaneous maximum | report only (lb/d) | all year | 002 |
| Barium, total [as Ba] | monthly average | report only (ug/L) | all year | 002 |
| Barium, total [as Ba] | instantaneous maximum | report only (ug/L) | all year | 002 |
| Barium, total [as Ba] | monthly average | report only (lb/d) | all year | 002 |
| Barium, total [as Ba] | instantaneous maximum | report only (lb/d) | all year | 002 |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total [as Zn] | instantaneous maximum | report only (ug/L) | all year | 002 |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year | 002 |
| Zinc, total [as Zn] | instantaneous maximum | report only (lb/d) | all year | 002 |
| Benzene | monthly average | report only (ug/L) | all year | 002 |
| Benzene | instantaneous maximum | report only (ug/L) | all year | 002 |
| Benzene | monthly average | report only (lb/d) | all year | 002 |
| Benzene | instantaneous maximum | report only (lb/d) | all year | 002 |
| Chlorodibromomethane | monthly average | ≤ .99 ug/L | all year | 002 |
| Chlorodibromomethane | instantaneous maximum | ≤ 1.98 ug/L | all year | 002 |
| Chlorodibromomethane | monthly average | ≤ .0099 lb/d | all year | 002 |
| Chlorodibromomethane | instantaneous maximum | ≤ .0198 lb/d | all year | 002 |
| 1,1,2-Trichloroethane | monthly average | ≤ .68 ug/L | all year | 002 |
| 1,1,2-Trichloroethane | instantaneous maximum | ≤ 1.36 ug/L | all year | 002 |
| 1,1,2-Trichloroethane | monthly average | ≤ .0068 lb/d | all year | 002 |
| 1,1,2-Trichloroethane | instantaneous maximum | ≤ .0136 lb/d | all year | 002 |
| Ultraviolet light intensity | instantaneous maximum | report only (mW/cm2) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| E. coli | instantaneous maximum | report only (#/100mL) | all year | 002 |
| Coliform, fecal general | monthly average | ≤ 200 #/100mL | May–Sep | 002 |
| Coliform, fecal general | monthly average | ≤ 2000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | May–Sep | 002 |
| Coliform, fecal general | instantaneous maximum | ≤ 10000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | instantaneous maximum | ≤ 50 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 250 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | instantaneous maximum | ≤ 500 lb/d | all year | 002 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
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