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City of Sylvania

Sewage treatment plant, major discharger, Sylvania, Georgia. NPDES permit GA0021385 expired Jun 30, 2024; its limits still apply. Last 12 months: over a limit 25 times (last September 2026), 6 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form B1 monthly (52 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
22 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average6.3 mg/L≤ 5 mg/L26%
October 2025BOD, 5-day, 20 deg. C, weekly average8.7 mg/L≤ 7.5 mg/L16%
November 2025BOD, 5-day, 20 deg. C, monthly average10.1 mg/L≤ 5 mg/L102%
November 2025BOD, 5-day, 20 deg. C, weekly average14.7 mg/L≤ 7.5 mg/L96%
December 2025BOD, 5-day, 20 deg. C, monthly average8.3 mg/L≤ 5 mg/L66%
December 2025BOD, 5-day, 20 deg. C, weekly average13.3 mg/L≤ 7.5 mg/L77%
December 2025Oxygen, dissolved [DO], minimum5 mg/L≥ 6 mg/L17%
January 2026Oxygen, dissolved [DO], minimum2.7 mg/L≥ 6 mg/L55%
February 2026Oxygen, dissolved [DO], minimum2.4 mg/L≥ 6 mg/L60%
March 2026Oxygen, dissolved [DO], minimum2 mg/L≥ 6 mg/L67%
April 2026Oxygen, dissolved [DO], minimum1.7 mg/L≥ 6 mg/L72%
May 2026Oxygen, dissolved [DO], minimum1.3 mg/L≥ 6 mg/L78%
June 2026Oxygen, dissolved [DO], minimum3.1 mg/L≥ 6 mg/L48%
July 2026BOD, 5-day, 20 deg. C, monthly average18.7 mg/L≤ 5 mg/L274%
July 2026BOD, 5-day, 20 deg. C, monthly average36.4 kg/d≤ 29 kg/d26%
July 2026BOD, 5-day, 20 deg. C, weekly average24.7 mg/L≤ 7.5 mg/L229%
July 2026BOD, 5-day, 20 deg. C, weekly average50.1 kg/d≤ 36 kg/d39%
August 2026BOD, 5-day, 20 deg. C, monthly average22.4 mg/L≤ 5 mg/L348%
August 2026BOD, 5-day, 20 deg. C, monthly average55.7 kg/d≤ 29 kg/d92%
August 2026BOD, 5-day, 20 deg. C, weekly average25.3 mg/L≤ 7.5 mg/L237%
August 2026BOD, 5-day, 20 deg. C, weekly average64.5 kg/d≤ 36 kg/d79%
September 2026BOD, 5-day, 20 deg. C, monthly average16.1 mg/L≤ 5 mg/L222%
September 2026BOD, 5-day, 20 deg. C, monthly average49.8 kg/d≤ 29 kg/d72%
September 2026BOD, 5-day, 20 deg. C, weekly average18 mg/L≤ 7.5 mg/L140%
September 2026BOD, 5-day, 20 deg. C, weekly average60.2 kg/d≤ 36 kg/d67%

Limits in force (52)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 7.5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 29 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 36 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (kg/d)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (kg/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendedweekly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 114 kg/dall year
Solids, total suspendedweekly average≤ 143 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (kg/d)all year
Solids, total suspendedweekly averagereport only (kg/d)all year
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ .7 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 1.1 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 4 kg/dall year
Nitrogen, ammonia total [as N]weekly average≤ 5 kg/dall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Cyanide, total [as CN]monthly average≤ 5.6 ug/Lall year
Cyanide, total [as CN]weekly average≤ 8.4 ug/Lall year
Cyanide, total [as CN]monthly average≤ .032 kg/dall year
Cyanide, total [as CN]weekly average≤ .04 kg/dall year
Zinc, total recoverablemonthly average≤ 209 ug/Lall year
Zinc, total recoverableweekly average≤ 209 ug/Lall year
Zinc, total recoverablemonthly average≤ 1.2 kg/dall year
Zinc, total recoverableweekly average≤ 1.2 kg/dall year
Copper, total recoverablemonthly average≤ 13.1 ug/Lall year
Copper, total recoverableweekly average≤ 18.1 ug/Lall year
Copper, total recoverablemonthly average≤ .075 kg/dall year
Copper, total recoverableweekly average≤ .104 kg/dall year
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year
Di[2-ethylhexyl] phthalate [DEHP]monthly averagereport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ 1.51 MGDall year
Flow, in conduit or thru treatment plantweekly average≤ 1.89 MGDall year
Chlorine, total residualdaily maximum≤ .011 mg/Lall year
Mercury, total recoverablemonthly averagereport only (ug/L)all year
Coliform, fecal generalmonthly average≤ 200 #/100mLall year
Coliform, fecal generalweekly average≤ 400 #/100mLall year
Solids, sludge, total, dry weightmonthly totalreport only (dry ton)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiaminimumreport only (%)all year
Noel Statre 7Day Chronic Pimephalesminimumreport only (%)all year

How strict are these limits?

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

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