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Sewerage Systems, Denmark, Tennessee. NPDES permit TN0023230 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 53 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 18.5 mg/L | ≤ 10 mg/L | 85% |
| October 2025 | E. coli, daily maximum | 484000 #/100mL | ≤ 941 #/100mL | 51335% |
| October 2025 | E. coli, monthly average | 397310 #/100mL | ≤ 126 #/100mL | — |
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 25 mg/L | ≤ 1.7 mg/L | 1371% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 25 mg/L | ≤ .4 mg/L | 6150% |
| November 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 17.5 mg/L | ≤ 15 mg/L | 17% |
| November 2025 | E. coli, daily maximum | 137340 #/100mL | ≤ 941 #/100mL | 14495% |
| November 2025 | E. coli, monthly average | 115470 #/100mL | ≤ 126 #/100mL | 91543% |
| November 2025 | Nitrogen, ammonia total [as N], daily maximum | 25 mg/L | ≤ 3 mg/L | 733% |
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 23.4 mg/L | ≤ .78 mg/L | 2900% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 21 mg/L | ≤ 15 mg/L | 40% |
| December 2025 | E. coli, daily maximum | 483920 #/100mL | ≤ 941 #/100mL | 51326% |
| December 2025 | E. coli, monthly average | 243170 #/100mL | ≤ 126 #/100mL | — |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 24.5 mg/L | ≤ 3 mg/L | 717% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 23.7 mg/L | ≤ .78 mg/L | 2938% |
| January 2026 | E. coli, daily maximum | 2420 #/100mL | ≤ 941 #/100mL | 157% |
| January 2026 | E. coli, monthly average | 1239 #/100mL | ≤ 126 #/100mL | 883% |
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 25 mg/L | ≤ 3 mg/L | 733% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 24 mg/L | ≤ .78 mg/L | 2977% |
| February 2026 | E. coli, daily maximum | 2420 #/100mL | ≤ 941 #/100mL | 157% |
| February 2026 | E. coli, monthly average | 2420 #/100mL | ≤ 126 #/100mL | 1821% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 8 mg/L | ≤ 3 mg/L | 167% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 5.5 mg/L | ≤ .78 mg/L | 605% |
| March 2026 | E. coli, daily maximum | 2420 #/100mL | ≤ 941 #/100mL | 157% |
| March 2026 | E. coli, monthly average | 1231 #/100mL | ≤ 126 #/100mL | 877% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 9 mg/L | ≤ 3 mg/L | 200% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 7.3 mg/L | ≤ .78 mg/L | 836% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], daily maximum | 120 mg/L | ≤ 30 mg/L | 300% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 72 mg/L | ≤ 15 mg/L | 380% |
| April 2026 | E. coli, monthly average | 247 #/100mL | ≤ 126 #/100mL | 96% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 23 mg/L | ≤ 3 mg/L | 667% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 17.4 mg/L | ≤ .78 mg/L | 2131% |
| April 2026 | Solids, total suspended, daily maximum | 117 mg/L | ≤ 45 mg/L | 160% |
| April 2026 | Solids, total suspended, monthly average | 62 mg/L | ≤ 30 mg/L | 107% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], daily maximum | 40 mg/L | ≤ 20 mg/L | 100% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 22 mg/L | ≤ 10 mg/L | 120% |
| May 2026 | Nitrogen, ammonia total [as N], daily maximum | 1.8 mg/L | ≤ 1.7 mg/L | 6% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | .9 mg/L | ≤ .4 mg/L | 125% |
| June 2026 | E. coli, daily maximum | 1200 #/100mL | ≤ 941 #/100mL | 28% |
| June 2026 | E. coli, monthly average | 1100 #/100mL | ≤ 126 #/100mL | 773% |
| July 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 12 mg/L | ≤ 10 mg/L | 20% |
| July 2026 | E. coli, daily maximum | 1200 #/100mL | ≤ 941 #/100mL | 28% |
| July 2026 | E. coli, monthly average | 964 #/100mL | ≤ 126 #/100mL | 665% |
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 20 mg/L | ≤ 1.7 mg/L | 1076% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 17 mg/L | ≤ .4 mg/L | 4150% |
| August 2026 | BOD, carbonaceous [5 day, 20 C], daily maximum | 26 mg/L | ≤ 20 mg/L | 30% |
| August 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 15 mg/L | ≤ 10 mg/L | 50% |
| August 2026 | E. coli, daily maximum | 2420 #/100mL | ≤ 941 #/100mL | 157% |
| August 2026 | E. coli, monthly average | 1247 #/100mL | ≤ 126 #/100mL | 890% |
| August 2026 | Nitrogen, ammonia total [as N], daily maximum | 30.1 mg/L | ≤ 1.7 mg/L | 1671% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 18.6 mg/L | ≤ .4 mg/L | 4550% |
| September 2026 | Nitrogen, ammonia total [as N], daily maximum | 8 mg/L | ≤ 1.7 mg/L | 371% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | 7.8 mg/L | ≤ .4 mg/L | 1850% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year |
| Solids, settleable | daily maximum | ≤ 1 mL/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .4 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .78 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.7 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 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 |
| Chlorine, total residual | daily maximum | ≤ .02 mg/L | all year |
| E. coli | monthly average | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | ≤ 941 #/100mL | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | May–Oct |
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/TN0023230 · MCP: https://passage-data.com/mcp