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Sewage treatment plant, Watertown, Tennessee. NPDES permit TN0025488, in force until Jul 31, 2029. Last 12 months: over a limit once (last January 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| January 2026 | SSO, Wet Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 40 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 68 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 90 lb/d | all year | 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] | rolling average | ≤ 22134 lb/yr | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ .7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.2 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.7 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.2 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | 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 | ≤ 2865 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 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 410 #/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 | ≤ 25 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 | ≤ 30 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 | ≤ 35 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 | ≤ 56 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 23 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 68 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 34 lb/d | May–Oct | 001 |
| BOD, carbonaceous, percent removal | daily minimum | > 40 % | all year | 001 |
| BOD, carbonaceous, percent removal | monthly average minimum | > 85 % | 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 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | > 100 % | all year | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | minimum | > 100 % | all year | 001 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | DNST |
| Conductivity | value | report only (umho/cm) | all year | DNST |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | DNST |
| pH | value | report only (SU) | all year | DNST |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | DNST |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | DNST |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | DNST |
| Phosphate, ortho [as PO4] | value | report only (mg/L) | all year | DNST |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | DNST |
| E. coli | geometric mean | report only (#/100mL) | all year | DNST |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | IMP1 |
| Conductivity | value | report only (umho/cm) | all year | IMP1 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | IMP1 |
| pH | value | report only (SU) | all year | IMP1 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | IMP1 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | IMP1 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | IMP1 |
| Phosphate, ortho [as PO4] | value | report only (mg/L) | all year | IMP1 |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | IMP1 |
| E. coli | geometric mean | report only (#/100mL) | all year | IMP1 |
| 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 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | UPST |
| Conductivity | value | report only (umho/cm) | all year | UPST |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | UPST |
| pH | value | report only (SU) | all year | UPST |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | UPST |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | UPST |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | UPST |
| Phosphate, ortho [as PO4] | value | report only (mg/L) | all year | UPST |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | UPST |
| E. coli | geometric mean | report only (#/100mL) | all year | UPST |
Cited limits by parameter: Tennessee's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/TN0025488 · MCP: https://passage-data.com/mcp