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Sewage treatment plant, major discharger, Clarksville, Tennessee. NPDES permit TN0020656, in force until Jan 31, 2030. Last 12 months: over a limit 16 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 410 MPN/100mL | 490% |
| November 2025 | SSO, Dry Weather, monthly total | 2 occur/mo | ≤ 0 occur/mo | — |
| December 2025 | E. coli, daily maximum | > 2419.6 MPN/100mL | ≤ 410 MPN/100mL | — |
| December 2025 | SSO, Dry Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo | — |
| January 2026 | E. coli, daily maximum | < 2419.6 MPN/100mL | ≤ 410 MPN/100mL | 490% |
| January 2026 | SSO, Dry Weather, monthly total | 2 occur/mo | ≤ 0 occur/mo | — |
| February 2026 | SSO, Dry Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo | — |
| February 2026 | SSO, Wet Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo | — |
| April 2026 | Chlorine, total residual, daily maximum | 1.5 mg/L | ≤ 1.2 mg/L | 25% |
| April 2026 | E. coli, daily maximum | 410.6 MPN/100mL | ≤ 410 MPN/100mL | 0% |
| April 2026 | SSO, Dry Weather, monthly total | 2 occur/mo | ≤ 0 occur/mo | — |
| May 2026 | SSO, Wet Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo | — |
| June 2026 | SSO, Dry Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo | — |
| July 2026 | SSO, Dry Weather, monthly total | 4 occur/mo | ≤ 0 occur/mo | — |
| July 2026 | SSO, Wet Weather, monthly total | 7 occur/mo | ≤ 0 occur/mo | — |
| August 2026 | SSO, Wet Weather, monthly total | 1 occur/mo | ≤ 0 occur/mo | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 1 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 | ≤ 6255 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 9383 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 8340 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, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | 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 |
| Cyanide, total [as CN] | monthly average | ≤ .04 mg/L | 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 | monthly average | ≤ .93 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 1.2 mg/L | all year | 001 |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 410 MPN/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 | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 35 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5213 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 8340 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 7298 lb/d | all year | 001 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | 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 | ≥ 3 % | all year | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | minimum | ≥ 3 % | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, settleable | daily maximum | report only (mL/L) | 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 | daily maximum | report only (#/100mL) | all year | 002 |
| Discharge event observation [Visual Monitoring] | total | ≤ 6 occur/yr | all year | 002 |
| Discharge event observation [Visual Monitoring] | annual average | ≤ 4 occur/yr | all year | 002 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (occur/mo) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Discharge event observation [Visual Monitoring] | total | ≤ 6 occur/yr | all year | 004 |
| Discharge event observation [Visual Monitoring] | annual average | ≤ 4 occur/yr | all year | 004 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (occur/mo) | all year | 004 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 006 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 006 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 006 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 006 |
| pH | minimum | ≥ 6 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 006 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| E. coli | monthly average | report only (#/100mL) | all year | 006 |
| Discharge event observation [Visual Monitoring] | total | ≤ 6 occur/yr | all year | 006 |
| Discharge event observation [Visual Monitoring] | annual average | ≤ 4 occur/yr | all year | 006 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (occur/mo) | all year | 006 |
| 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], daily maximum | 73186.7 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 351.02 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | new | 17.3 mg/L (6 values) | 0.0493× |
| Nitrogen, ammonia total [as N], daily maximum | 31607.9 lb/d (Apr–Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 151.6 mg/L (Apr–Oct) | new | 13.8 mg/L (7 values) | 0.091× |
| Nitrogen, ammonia total [as N], monthly average | 47.63 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | new | 10.68 mg/L (6 values) | 0.224× |
| Nitrogen, ammonia total [as N], monthly average | 9931.7 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | new | — | — |
| Nitrogen, ammonia total [as N], monthly average | 4926.1 lb/d (Apr–Oct) | new | — | — |
| Nitrogen, ammonia total [as N], monthly average | 23.63 mg/L (Apr–Oct) | new | 6.97 mg/L (7 values) | 0.295× |
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/TN0020656 · MCP: https://passage-data.com/mcp