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Denmark City of

Sewage treatment plant, Denmark, South Carolina. NPDES permit SC0040215 expired Sep 30, 2018; its limits still apply. Last 12 months: over a limit 7 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Last report on file
February 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 8 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, suspended percent removal, monthly average minimum34≥ 85 %340%
December 2025BOD, 5-day, percent removal, monthly average minimum82≥ 85 %20%
December 2025Solids, suspended percent removal, monthly average minimum3.5≥ 85 %543%
January 2026E. coli, 30-day geometric mean> 2166≤ 126 MPN/100mL—
January 2026E. coli, daily maximum> 2420≤ 349 MPN/100mL—
February 2026BOD, 5-day, percent removal, monthly average minimum79≥ 85 %40%
February 2026E. coli, daily maximum1733≤ 349 MPN/100mL397%

Limits in force (27)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 2 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 97 lb/dJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 146 lb/dJan, Feb, Nov, Dec
pHminimum≥ 6 SUJan, Feb, Nov, Dec
pHmaximum≤ 8.5 SUJan, Feb, Nov, Dec
Solids, total suspendedmonthly average≤ 90 mg/LJan, Feb, Nov, Dec
Solids, total suspendedweekly average≤ 135 mg/LJan, Feb, Nov, Dec
Solids, total suspendedmonthly average≤ 291 lb/dJan, Feb, Nov, Dec
Solids, total suspendedweekly average≤ 437 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 15 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 22.5 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 49 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 74 lb/dJan, Feb, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Nov, Dec
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)Jan, Feb, Nov, Dec
Chlorine, total residualmonthly average≤ .081 mg/LJan, Feb, Nov, Dec
Chlorine, total residualdaily maximum≤ .139 mg/LJan, Feb, Nov, Dec
Chlorine, total residualmonthly average≤ .262 lb/dJan, Feb, Nov, Dec
Chlorine, total residualdaily maximum≤ .449 lb/dJan, Feb, Nov, Dec
E. coli30-day geometric mean≤ 126 MPN/100mLJan, Feb, Nov, Dec
E. colidaily maximum≤ 349 MPN/100mLJan, Feb, Nov, Dec
E. coli30-day geometric mean≤ 126 MPN/100mLJan, Feb, Nov, Dec
E. colidaily maximum≤ 800 MPN/100mLJan, Feb, Nov, Dec
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Nov, Dec

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/SC0040215 · MCP: https://passage-data.com/mcp