Spartanburg Sanitary Sewer District — NPDES permit SC0020435: limits, due date and EPA's record

Sewage treatment plant, major discharger, Spartanburg, South Carolina. NPDES permit SC0020435 expired Mar 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (157)

Parameter	Statistic	Limit	Months	Outfall
Oxygen demand, ultimate	monthly average	≤ 12823 lb/d	Mar–Oct	001
Oxygen demand, ultimate	monthly average	≤ 20404 lb/d	Jan, Feb, Nov, Dec	001
Oxygen demand, ultimate	monthly average	≤ 12745 lb/d	Mar–Oct	001
Oxygen demand, ultimate	monthly average	≤ 19891 lb/d	Jan, Feb, Nov, Dec	001
Oxygen demand, ultimate	weekly average	≤ 19235 lb/d	Mar–Oct	001
Oxygen demand, ultimate	weekly average	≤ 30606 lb/d	Jan, Feb, Nov, Dec	001
Oxygen demand, ultimate	weekly average	≤ 19118 lb/d	Mar–Oct	001
Oxygen demand, ultimate	weekly average	≤ 29837 lb/d	Jan, Feb, Nov, Dec	001
Oxygen, dissolved [DO]	minimum	≥ 6 mg/L	all year	001
Oxygen, dissolved [DO]	minimum	≥ 6 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 7506 lb/d	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 6255 lb/d	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 11259 lb/d	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 9383 lb/d	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	daily maximum	≤ 8.5 SU	all year	001
pH	maximum	≤ 8.5 SU	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	monthly average	≤ 7506 lb/d	all year	001
Solids, total suspended	monthly average	≤ 6255 lb/d	all year	001
Solids, total suspended	weekly average	≤ 11259 lb/d	all year	001
Solids, total suspended	weekly average	≤ 9383 lb/d	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	weekly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	weekly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	monthly average	report only (lb/d)	all year	001
Nitrogen, total [as N]	monthly average	report only (lb/d)	all year	001
Nitrogen, total [as N]	weekly average	report only (lb/d)	all year	001
Nitrogen, total [as N]	weekly average	report only (lb/d)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4.99 mg/L	Mar–Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 11.35 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 5.17 mg/L	Mar–Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 12.67 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	weekly average	≤ 7.49 mg/L	Mar–Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 17.03 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	weekly average	≤ 7.76 mg/L	Mar–Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 19 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1248 lb/d	Mar–Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2840 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1078 lb/d	Mar–Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2642 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	weekly average	≤ 1874 lb/d	Mar–Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4261 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	weekly average	≤ 1617 lb/d	Mar–Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3963 lb/d	Jan, Feb, Nov, Dec	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	weekly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	weekly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year	001
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year	001
Phosphorus, total [as P]	weekly average	report only (lb/d)	all year	001
Phosphorus, total [as P]	weekly average	report only (lb/d)	all year	001
Cyanide, total [as CN]	monthly average	≤ .017 mg/L	all year	001
Cyanide, total [as CN]	monthly average	≤ .015 mg/L	all year	001
Cyanide, total [as CN]	daily maximum	≤ .071 mg/L	all year	001
Cyanide, total [as CN]	daily maximum	≤ .063 mg/L	all year	001
Cyanide, total [as CN]	monthly average	≤ 3.54 lb/d	all year	001
Cyanide, total [as CN]	monthly average	≤ 3.75 lb/d	all year	001
Cyanide, total [as CN]	daily maximum	≤ 14.8 lb/d	all year	001
Cyanide, total [as CN]	daily maximum	≤ 15.76 lb/d	all year	001
Dibromochloromethane	monthly average	≤ .038 mg/L	all year	001
Dibromochloromethane	monthly average	≤ .032 mg/L	all year	001
Dibromochloromethane	daily maximum	≤ .056 mg/L	all year	001
Dibromochloromethane	daily maximum	≤ .047 mg/L	all year	001
Dibromochloromethane	monthly average	≤ 7.92 lb/d	all year	001
Dibromochloromethane	monthly average	≤ 8 lb/d	all year	001
Dibromochloromethane	daily maximum	≤ 11.68 lb/d	all year	001
Dibromochloromethane	daily maximum	≤ 11.76 lb/d	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	weekly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	weekly average	report only (MGD)	all year	001
Chlorine, total residual	monthly average	≤ .032 mg/L	all year	001
Chlorine, total residual	monthly average	≤ .036 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .055 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .062 mg/L	all year	001
Chlorine, total residual	monthly average	≤ 8.01 lb/d	all year	001
Chlorine, total residual	monthly average	≤ 7.51 lb/d	all year	001
Chlorine, total residual	daily maximum	≤ 13.76 lb/d	all year	001
Chlorine, total residual	daily maximum	≤ 12.93 lb/d	all year	001
E. coli	30-day geometric mean	≤ 126 MPN/100mL	all year	001
E. coli	30-day geometric mean	≤ 126 MPN/100mL	all year	001
E. coli	daily maximum	≤ 349 MPN/100mL	all year	001
E. coli	daily maximum	≤ 349 MPN/100mL	all year	001
E. coli	30-day geometric mean	≤ 126 MPN/100mL	all year	001
E. coli	30-day geometric mean	≤ 126 MPN/100mL	all year	001
E. coli	daily maximum	≤ 800 MPN/100mL	all year	001
E. coli	daily maximum	≤ 800 MPN/100mL	all year	001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	monthly average	≤ 25 %	all year	001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	monthly average	≤ 25 %	all year	001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily maximum	≤ 40 %	all year	001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily maximum	≤ 40 %	all year	001
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia	daily maximum	≤ 0 pass=0;fail=1	all year	001
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia	daily maximum	≤ 0 pass=0;fail=1	all year	001
Oxygen demand, ultimate	monthly average	report only (lb/d)	Jan, Feb, Nov, Dec	002
Oxygen demand, ultimate	monthly average	≤ 4718 lb/d	Mar–Oct	002
Oxygen demand, ultimate	weekly average	report only (lb/d)	Jan, Feb, Nov, Dec	002
Oxygen demand, ultimate	weekly average	≤ 7077 lb/d	Mar–Oct	002
Oxygen, dissolved [DO]	minimum	≥ 6 mg/L	all year	002
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	002
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	002
BOD, 5-day, 20 deg. C	monthly average	≤ 3002 lb/d	all year	002
BOD, 5-day, 20 deg. C	weekly average	≤ 4504 lb/d	all year	002
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 8.5 SU	all year	002
Solids, total suspended	monthly average	≤ 30 mg/L	all year	002
Solids, total suspended	weekly average	≤ 45 mg/L	all year	002
Solids, total suspended	monthly average	≤ 3002 lb/d	all year	002
Solids, total suspended	weekly average	≤ 4504 lb/d	all year	002
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	002
Nitrogen, total [as N]	weekly average	report only (mg/L)	all year	002
Nitrogen, total [as N]	monthly average	report only (lb/d)	all year	002
Nitrogen, total [as N]	weekly average	report only (lb/d)	all year	002
Nitrogen, ammonia total [as N]	monthly average	≤ 6.01 mg/L	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	monthly average	≤ 3.24 mg/L	Mar–Oct	002
Nitrogen, ammonia total [as N]	weekly average	≤ 9.02 mg/L	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	weekly average	≤ 5.13 mg/L	Mar–Oct	002
Nitrogen, ammonia total [as N]	monthly average	≤ 601.5 lb/d	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	monthly average	≤ 324.3 lb/d	Mar–Oct	002
Nitrogen, ammonia total [as N]	weekly average	≤ 902 lb/d	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	weekly average	≤ 513.4 lb/d	Mar–Oct	002
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	002
Phosphorus, total [as P]	weekly average	report only (mg/L)	all year	002
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year	002
Phosphorus, total [as P]	weekly average	report only (lb/d)	all year	002
Cyanide, total [as CN]	monthly average	≤ .0072 mg/L	all year	002
Cyanide, total [as CN]	daily maximum	≤ .031 mg/L	all year	002
Cyanide, total [as CN]	monthly average	≤ .72 lb/d	all year	002
Cyanide, total [as CN]	daily maximum	≤ 3.1 lb/d	all year	002
Dibromochloromethane	monthly average	≤ .039 mg/L	all year	002
Dibromochloromethane	daily maximum	≤ .057 mg/L	all year	002
Dibromochloromethane	monthly average	≤ 3.9 lb/d	all year	002
Dibromochloromethane	daily maximum	≤ 5.7 lb/d	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	weekly average	report only (MGD)	all year	002
Chlorine, total residual	monthly average	≤ .015 mg/L	all year	002
Chlorine, total residual	daily maximum	≤ .026 mg/L	all year	002
Chlorine, total residual	monthly average	≤ 1.5 lb/d	all year	002
Chlorine, total residual	daily maximum	≤ 2.6 lb/d	all year	002
E. coli	30-day geometric mean	≤ 126 MPN/100mL	all year	002
E. coli	daily maximum	≤ 349 MPN/100mL	all year	002
E. coli	30-day geometric mean	≤ 126 MPN/100mL	all year	002
E. coli	daily maximum	≤ 800 MPN/100mL	all year	002
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	monthly average	≤ 25 %	all year	002
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily maximum	≤ 40 %	all year	002
BOD, 5-day, 20 deg. C	monthly average minimum	≥ 85 %	all year	003
Solids, total suspended	monthly average minimum	≥ 85 %	all year	003

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/SC0020435 · MCP: https://passage-data.com/mcp