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Town of Columbia

Sewage treatment plant, Columbia, North Carolina. NPDES permit NC0020443, in force until Dec 31, 2027. Last 12 months: over a limit 4 times (last June 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 31 days after each period: form M monthly (16 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 7 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], 30-day average4.255 mg/L≤ 2 mg/L113%
February 2026Nitrogen, ammonia total [as N], 7-day average6.8 mg/L≤ 6 mg/L13%
June 2026BOD, 5-day, 20 deg. C, 7-day average12.6666 mg/L≤ 10.5 mg/L21%
June 2026Enterococci, weekly geometric mean746.3888 CFU/100mL≤ 276 CFU/100mL170%

Limits in force (16)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 10.5 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 7 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHdaily minimum≥ 6.8 SUall year
pHdaily maximum≤ 8.5 SUall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/Lall year
Flow, in conduit or thru treatment plant30-day average≤ .6 MGDall year
Chlorine, total residualdaily maximum≤ 13 ug/Lall year
Enterococciweekly geometric mean≤ 276 CFU/100mLall year
Enterococcimonthly geometric mean≤ 35 CFU/100mLall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NC0020443 · MCP: https://passage-data.com/mcp