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Greenwood Metropolitan District

Sewage treatment plant, major discharger, Greenwood, South Carolina. NPDES permit SC0022870 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 3 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (31 values), form 2 quarterly (8 values), form 4 twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], monthly average3.74≤ 1.84 mg/L103%
January 2026Nitrogen, ammonia total [as N], weekly average7.4≤ 2.76 mg/L168%
February 2026Nitrogen, ammonia total [as N], weekly average3.24≤ 2.76 mg/L17%

Limits in force (45)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 183 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 275 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 550 lb/dall year
Solids, total suspendedweekly average≤ 825 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.16 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.84 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 1.74 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 2.76 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 21 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 34 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 32 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 51 lb/dJan, Feb, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Cyanide [A]monthly average≤ .0054 mg/Lall year
Cyanide [A]daily maximum≤ .023 mg/Lall year
Cyanide [A]monthly average≤ .1 lb/dall year
Cyanide [A]daily maximum≤ .42 lb/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .01 mg/Lall year
Chlorine, total residualdaily maximum≤ .02 mg/Lall year
Chlorine, total residualmonthly average≤ .18 lb/dall year
Chlorine, total residualdaily maximum≤ .37 lb/dall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 800 MPN/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average≤ 25 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximum≤ 40 %all year

How strict are these limits?

Cited limits by parameter: South Carolina'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/SC0022870 · MCP: https://passage-data.com/mcp