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Sewage treatment plant, major discharger, Maryville, Tennessee. NPDES permit TN0020079, in force until Dec 31, 2027. Last 12 months: over a limit 5 times (last July 2026), 157 required values missing, 4 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | BOD, carbonaceous, percent removal, daily minimum | -5 % | ≥ 40 % | 75% |
| May 2026 | Nitrogen, ammonia total [as N], daily maximum | 1470 lb/d | ≤ 700 lb/d | 110% |
| May 2026 | Nitrogen, ammonia total [as N], daily maximum | 8.86 mg/L | ≤ 6 mg/L | 48% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 125 lb/d | ≤ 117 lb/d | 7% |
| July 2026 | E. coli, daily maximum | 488.2 #/100mL | ≤ 487 #/100mL | 0% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 3 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 21 mg/L | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 18 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 29 mg/L | May–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 24 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | May–Oct | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 2502 lb/d | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 2502 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 3336 lb/d | May–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 3336 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, settleable | daily maximum | ≤ 1 mL/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | rolling average | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | rolling average | report only (lb/yr) | 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 |
| Chlorine, total residual | daily maximum | ≤ .92 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ 1.12 mg/L | May–Oct | 001 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 487 #/100mL | all year | 001 |
| SSO, Dry Weather | monthly total | ≤ 0 occur/mo | all year | 001 |
| SSO, Wet Weather | monthly total | ≤ 0 occur/mo | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 23 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2085 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1168 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 3128 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1751 lb/d | May–Oct | 001 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, carbonaceous, percent removal | daily minimum | ≥ 40 % | all year | 001 |
| Solids, suspended percent removal | daily minimum | ≥ 40 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | > 37 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | > 32 % | May–Oct | 001 |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | > 32 % | May–Oct | 001 |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | > 37 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 18 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | monthly average | ≤ 21 mg/L | May–Oct | 002 |
| Solids, total suspended | weekly average | ≤ 24 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | weekly average | ≤ 29 mg/L | May–Oct | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | May–Oct | 002 |
| Solids, total suspended | monthly average | ≤ 2502 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | monthly average | ≤ 2502 lb/d | May–Oct | 002 |
| Solids, total suspended | weekly average | ≤ 3336 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | weekly average | ≤ 3336 lb/d | May–Oct | 002 |
| Solids, settleable | daily maximum | ≤ 1 mL/L | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily 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] | daily maximum | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | rolling average | report only (lb/yr) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.5 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 117 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 142 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 700 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1418 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 525 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1063 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] | daily 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] | daily maximum | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | rolling average | report only (lb/yr) | 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 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Chlorine, total residual | daily maximum | ≤ .06 mg/L | May–Oct | 002 |
| E. coli | monthly average | ≤ 126 #/100mL | all year | 002 |
| E. coli | daily maximum | ≤ 487 #/100mL | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 23 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2085 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1168 lb/d | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 3128 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1751 lb/d | May–Oct | 002 |
| BOD, carbonaceous, percent removal | daily minimum | ≥ 40 % | all year | 002 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | daily minimum | ≥ 40 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | > 37 % | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | > 32 % | May–Oct | 002 |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | > 32 % | May–Oct | 002 |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | > 37 % | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF1 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | INF1 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | INF1 |
Cited limits by parameter: Tennessee's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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