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Sewage treatment plant, major discharger, Canonsburg, Pennsylvania. NPDES permit PA0025941, in force until Jan 31, 2029. Last 12 months: over a limit 15 times (last June 2026), 63 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 3.6 mg/L | ≤ 3.5 mg/L | 3% |
| February 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 21.3 mg/L | ≤ 21.2 mg/L | 0% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 13.9 mg/L | ≤ 7 mg/L | 99% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 450.6 | ≤ 350.7 lb/d | 28% |
| February 2026 | Nitrogen, ammonia total [as N], weekly average | 18.6 mg/L | ≤ 10.5 mg/L | 77% |
| February 2026 | Nitrogen, ammonia total [as N], weekly average | 595.7 | ≤ 526.1 lb/d | 13% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 456 | ≤ 350.7 lb/d | 30% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 8.4 mg/L | ≤ 7 mg/L | 20% |
| March 2026 | Nitrogen, ammonia total [as N], weekly average | 11.2 mg/L | ≤ 10.5 mg/L | 7% |
| March 2026 | Nitrogen, ammonia total [as N], weekly average | 681.7 | ≤ 526.1 lb/d | 30% |
| May 2026 | Coliform, fecal general, instantaneous maximum | 2420 #/100mL | ≤ 1000 #/100mL | 142% |
| June 2026 | Coliform, fecal general, instantaneous maximum | 2420 #/100mL | ≤ 1000 #/100mL | 142% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 4.8 mg/L | ≤ 3.5 mg/L | 37% |
| June 2026 | Nitrogen, ammonia total [as N], weekly average | 6 mg/L | ≤ 5.3 mg/L | 13% |
| June 2026 | pH, instantaneous minimum | 5.9 SU | ≥ 6 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 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 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous 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 | ≤ 2100 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 3150 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 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.5 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5.3 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 10.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 175.4 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 350.7 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 265.5 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 526.1 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Boron, total [as B] | monthly average | report only (ug/L) | all year |
| Boron, total [as B] | daily maximum | report only (ug/L) | all year |
| Boron, total [as B] | monthly average | report only (lb/d) | all year |
| Boron, total [as B] | daily maximum | report only (lb/d) | all year |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year |
| Iron, total [as Fe] | monthly average | report only (ug/L) | all year |
| Iron, total [as Fe] | daily maximum | report only (ug/L) | all year |
| Iron, total [as Fe] | monthly average | report only (lb/d) | all year |
| Iron, total [as Fe] | daily maximum | report only (lb/d) | all year |
| Iron, dissolved [as Fe] | monthly average | report only (ug/L) | all year |
| Iron, dissolved [as Fe] | daily maximum | report only (ug/L) | all year |
| Iron, dissolved [as Fe] | monthly average | report only (lb/d) | all year |
| Iron, dissolved [as Fe] | daily maximum | report only (lb/d) | all year |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year |
| Dichlorobromomethane | monthly average | report only (ug/L) | all year |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year |
| Dichlorobromomethane | monthly average | report only (lb/d) | all year |
| Dichlorobromomethane | daily maximum | report only (lb/d) | all year |
| Chlorodibromomethane | monthly average | report only (ug/L) | all year |
| Chlorodibromomethane | daily maximum | report only (ug/L) | all year |
| Chlorodibromomethane | monthly average | report only (lb/d) | all year |
| Chlorodibromomethane | daily maximum | 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 | daily maximum | report only (MGD) | all year |
| E. coli | daily maximum | report only (#/100mL) | all year |
| Ultraviolet light transmittance | daily minimum | report only (%) | all year |
| Cyanide, free available | monthly average | report only (ug/L) | all year |
| Cyanide, free available | daily maximum | report only (ug/L) | all year |
| Cyanide, free available | monthly average | report only (lb/d) | all year |
| Cyanide, free available | daily maximum | report only (lb/d) | all year |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Sep |
| Coliform, fecal general | geometric mean | ≤ 2000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | May–Sep |
| Coliform, fecal general | instantaneous maximum | ≤ 10000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 12.9 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 21.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 19.3 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 31.8 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 903 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1485 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1352 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 2227 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], monthly average | 2.16 mg/L (May–Oct) | tighter | 3.6 mg/L (3 values) | 1.67× |
| Nitrogen, ammonia total [as N], monthly average | 4.47 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 5.5 mg/L (6 values) | 1.23× |
| Nitrogen, ammonia total [as N], weekly average | 3.24 mg/L (May–Oct) | tighter | 4.5 mg/L (3 values) | 1.39× |
| Nitrogen, ammonia total [as N], weekly average | 6.7 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 7.9 mg/L (6 values) | 1.18× |
| Copper, total [as Cu], daily maximum | 25.4 ug/L | new | 16 ug/L (9 values) | 0.63× |
| Copper, total [as Cu], daily maximum | 1.78 lb/d | new | 0.4 lb/d (9 values) | 0.225× |
| Copper, total [as Cu], monthly average | 18.5 ug/L | new | 11.5 ug/L (9 values) | 0.622× |
| Copper, total [as Cu], monthly average | 1.3 lb/d | new | 0.3 lb/d (9 values) | 0.231× |
| Mercury, total [as Hg], daily maximum | 0.007 lb/d | new | 0.0003 lb/d (9 values) | 0.0429× |
| Mercury, total [as Hg], daily maximum | 0.11 ug/L | new | 0.0109 ug/L (9 values) | 0.0991× |
| Mercury, total [as Hg], monthly average | 0.004 lb/d | new | 0.0002 lb/d (9 values, 1 below detection) | 0.05× |
| Mercury, total [as Hg], monthly average | 0.058 ug/L | new | 0.00589 ug/L (9 values, 1 below detection) | 0.102× |
| Nitrogen, ammonia total [as N], monthly average | 151.3 lb/d (May–Oct) | tighter | 83.2 lb/d (3 values) | 0.55× |
| Nitrogen, ammonia total [as N], monthly average | 313.1 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 142.6 lb/d (6 values) | 0.455× |
| Nitrogen, ammonia total [as N], weekly average | 226.9 lb/d (May–Oct) | tighter | 98.8 lb/d (3 values) | 0.435× |
| Nitrogen, ammonia total [as N], weekly average | 469.7 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 286.4 lb/d (6 values) | 0.61× |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
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