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City of Thomson

Sewage treatment plant, major discharger, Thomson, Georgia. NPDES permit GA0020974 expired Feb 29, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 46 days after each period: outfall 001 form 1 monthly (38 values), outfall DSW form DS monthly (5 values), outfall USW form US monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 22.5 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 142.2 kg/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 177.7 kg/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (kg/d)all year001
BOD, 5-day, 20 deg. Cweekly averagereport only (kg/d)all year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 284 kg/dall year001
Solids, total suspendedweekly average≤ 355 kg/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Solids, total suspendedmonthly averagereport only (kg/d)all year001
Solids, total suspendedweekly averagereport only (kg/d)all year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJan, Feb, Mar, Apr, May, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .4 mg/LJun–Nov001
Nitrogen, ammonia total [as N]weekly average≤ 2.3 mg/LJan, Feb, Mar, Apr, May, Dec001
Nitrogen, ammonia total [as N]weekly average≤ .6 mg/LJun–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 14.2 kg/dJan, Feb, Mar, Apr, May, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.8 kg/dJun–Nov001
Nitrogen, ammonia total [as N]weekly average≤ 17.8 kg/dJan, Feb, Mar, Apr, May, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 4.7 kg/dJun–Nov001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Zinc, total recoverablemonthly average≤ 105.6 ug/Lall year001
Zinc, total recoverableweekly average≤ 105.6 ug/Lall year001
Zinc, total recoverablemonthly average≤ 1 kg/dall year001
Zinc, total recoverableweekly average≤ 1 kg/dall year001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly average≤ 2.5 MGDall year001
Flow, in conduit or thru treatment plantweekly average≤ 3.125 MGDall year001
Chlorine, total residualdaily maximum≤ .011 mg/Lall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
Solids, sludge, total, dry weightmonthly totalreport only (dry ton)all year001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiaminimum≥ 97 %all year001
Noel Statre 7Day Chronic Pimephalesminimum≥ 97 %all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all yearDSW
Temperature, water deg. fahrenheitweekly averagereport only (deg F)all yearDSW
Oxygen, dissolved [DO]minimumreport only (mg/L)all yearDSW
pHminimumreport only (SU)all yearDSW
pHmaximumreport only (SU)all yearDSW
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all yearUSW
Temperature, water deg. fahrenheitweekly averagereport only (deg F)all yearUSW
Oxygen, dissolved [DO]minimumreport only (mg/L)all yearUSW
pHminimumreport only (SU)all yearUSW
pHmaximumreport only (SU)all yearUSW

How strict are these limits?

Cited limits by parameter: Georgia'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/GA0020974 · MCP: https://passage-data.com/mcp