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Greene County Board of Education

Sewage treatment plant, Mohawk, Tennessee. NPDES permit TN0058254, in force until Sep 30, 2030. Last 12 months: over a limit 16 times (last September 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (16 values)
Last report on file
September 2026

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], monthly average12.5 mg/L≤ 10 mg/L25%
December 2025Solids, total suspended, monthly average31.25 mg/L≤ 30 mg/L4%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average11.5 mg/L≤ 10 mg/L15%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum36 mg/L≤ 20 mg/L80%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average36 mg/L≤ 10 mg/L260%
February 2026Nitrogen, ammonia total [as N], daily maximum5.44 mg/L≤ 3.8 mg/L43%
February 2026Nitrogen, ammonia total [as N], monthly average5.44 mg/L≤ 1.9 mg/L186%
February 2026Solids, total suspended, daily maximum< 81.4 mg/L≤ 45 mg/L81%
February 2026Solids, total suspended, monthly average< 40.7 mg/L≤ 30 mg/L36%
March 2026Nitrogen, ammonia total [as N], monthly average< 2.123 mg/L≤ 1.9 mg/L12%
March 2026pH, daily minimum5.74 SU≥ 6 SU—
May 2026Nitrogen, ammonia total [as N], daily maximum2.8 mg/L≤ 2 mg/L40%
May 2026Nitrogen, ammonia total [as N], monthly average1.9 mg/L≤ 1 mg/L90%
May 2026Oxygen, dissolved [DO], daily minimum4.15 mg/L≥ 5 mg/L17%
August 2026Oxygen, dissolved [DO], daily minimum4.09 mg/L≥ 5 mg/L18%
September 2026Nitrogen, ammonia total [as N], monthly average1.18 mg/L≤ 1 mg/L18%

Limits in force (18)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, settleabledaily maximum≤ 1 mL/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 2 mg/LMay–Oct
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .02 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0058254 · MCP: https://passage-data.com/mcp