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Oak Plains Academy of Tennessee, Inc.

Sewerage Systems, Clarksville, Tennessee. NPDES permit TN0056081, in force until Dec 31, 2030. Last 12 months: over a limit 8 times (last September 2026), 1 of 9 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (32 values)
Last report on file
September 2026

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], daily maximum30.3 mg/L≤ 1.89 mg/L1503%
February 2026Nitrogen, ammonia total [as N], monthly average15.15 mg/L≤ .94 mg/L1512%
May 2026Chlorine, total residual, daily maximum.02 mg/L≤ .019 mg/L5%
July 2026E. coli, monthly geometric mean147.92718 #/100mL≤ 126 #/100mL17%
August 2026Chlorine, total residual, daily maximum.05 mg/L≤ .019 mg/L163%
September 2026Chlorine, total residual, daily maximum.03 mg/L≤ .019 mg/L58%
September 2026Chlorine, total residual, monthly average< .02 mg/L≤ .01 mg/L100%
September 2026pH, daily minimum5.47 SU≥ 6 SU—

Limits in force (36)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, settleabledaily maximum≤ 1 mL/Lall year
Solids, settleabledaily maximum≤ 1 mL/Lall year
Nitrogen, ammonia total [as N]monthly average≤ .94 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .94 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .49 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ .49 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.89 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.89 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ .99 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ .99 mg/LMay–Oct
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .01 mg/Lall year
Chlorine, total residualmonthly average≤ .01 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/Lall year

How strict are these limits?

Cited limits by parameter: Tennessee's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/TN0056081 · MCP: https://passage-data.com/mcp