Summerville Commissioners of Public Works — NPDES permit SC0037541: limits, due date and EPA's record

Sewage treatment plant, major discharger, Summerville, South Carolina. NPDES permit SC0037541 expired Nov 30, 2024; its limits still apply. Last 12 months: no values over a limit, 18 required values missing. Source: EPA ECHO, Oct 22, 2026.

Limits in force (99)

Parameter	Statistic	Limit	Months	Outfall
Oxygen demand, ultimate	monthly average	≤ 3050 lb/d	Jan, Feb, Nov, Dec	001
Oxygen demand, ultimate	monthly average	≤ 2745 lb/d	Mar–Oct	001
Oxygen demand, ultimate	weekly average	≤ 4575 lb/d	Jan, Feb, Nov, Dec	001
Oxygen demand, ultimate	weekly average	≤ 4118 lb/d	Mar–Oct	001
Oxygen, dissolved [DO]	minimum	≥ 7 mg/L	all year	001
pH	minimum	≥ 6.5 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	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	monthly average	≤ 2502 lb/d	all year	001
Solids, total suspended	weekly average	≤ 3753 lb/d	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]	monthly 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	≤ 2.85 mg/L	all year	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4.28 mg/L	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 238 lb/d	all year	001
Nitrogen, ammonia total [as N]	weekly average	≤ 357 lb/d	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]	monthly average	report only (lb/d)	all year	001
Phosphorus, total [as P]	weekly average	report only (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	weekly average	report only (MGD)	all year	001
Chlorine, total residual	monthly average	≤ .011 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .018 mg/L	all year	001
Chlorine, total residual	monthly average	≤ 1 lb/d	all year	001
Chlorine, total residual	daily maximum	≤ 1.5 lb/d	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	30-day geometric mean	≤ 126 MPN/100mL	all year	001
E. coli	daily maximum	≤ 800 MPN/100mL	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 7.7 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	weekly average	≤ 11.6 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 642 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	weekly average	≤ 967 lb/d	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	001
LC50 Static 48Hr Acute Ceriodaphnia dubia	daily minimum	report only (%)	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	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
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily maximum	≤ 40 %	all year	001
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia	daily minimum	report only (pass=0;fail=1)	all year	001
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia	daily maximum	≤ 0 pass=0;fail=1	all year	001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily minimum	report only (%)	all year	001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily minimum	report only (%)	all year	001
Oxygen demand, ultimate	monthly average	≤ 36.57 mg/L	Jan, Feb, Nov, Dec	002
Oxygen demand, ultimate	monthly average	≤ 34.45 mg/L	Mar–Oct	002
Oxygen demand, ultimate	weekly average	≤ 54.86 mg/L	Jan, Feb, Nov, Dec	002
Oxygen demand, ultimate	weekly average	≤ 51.68 mg/L	Mar–Oct	002
Oxygen demand, ultimate	monthly average	≤ 3050 lb/d	Jan, Feb, Nov, Dec	002
Oxygen demand, ultimate	monthly average	≤ 2745 lb/d	Mar–Oct	002
Oxygen demand, ultimate	weekly average	≤ 4575 lb/d	Jan, Feb, Nov, Dec	002
Oxygen demand, ultimate	weekly average	≤ 4118 lb/d	Mar–Oct	002
Oxygen, dissolved [DO]	minimum	≥ 7 mg/L	all year	002
pH	minimum	≥ 6.5 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	≤ 2502 lb/d	all year	002
Solids, total suspended	weekly average	≤ 3753 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	≤ 1.82 mg/L	Mar–Oct	002
Nitrogen, ammonia total [as N]	monthly average	≤ 4.34 mg/L	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	weekly average	≤ 2.73 mg/L	Mar–Oct	002
Nitrogen, ammonia total [as N]	weekly average	≤ 6.51 mg/L	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	monthly average	≤ 152 lb/d	Mar–Oct	002
Nitrogen, ammonia total [as N]	monthly average	≤ 362 lb/d	Jan, Feb, Nov, Dec	002
Nitrogen, ammonia total [as N]	weekly average	≤ 228 lb/d	Mar–Oct	002
Nitrogen, ammonia total [as N]	weekly average	≤ 543 lb/d	Jan, Feb, Nov, Dec	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
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	≤ .011 mg/L	all year	002
Chlorine, total residual	daily maximum	≤ .018 mg/L	all year	002
Chlorine, total residual	monthly average	≤ 1 lb/d	all year	002
Chlorine, total residual	daily maximum	≤ 1.5 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
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 8.4 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	weekly average	≤ 12.6 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 701 lb/d	all year	002
BOD, carbonaceous [5 day, 20 C]	weekly average	≤ 1051 lb/d	all year	002
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	002
Solids, suspended percent removal	monthly average minimum	≥ 85 %	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

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/SC0037541 · MCP: https://passage-data.com/mcp