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City of Elizabeth City

Sewage treatment plant, major discharger, Elizabeth City, North Carolina. NPDES permit NC0025011 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 2 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 31 days after each period: form M monthly (36 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 9 required values missing, 4 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026Nitrogen, ammonia total [as N], 30-day average8.86 mg/L≤ 4 mg/L122%
April 2026Nitrogen, ammonia total [as N], 7-day average15.52 mg/L≤ 12 mg/L29%

Limits in force (40)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Conductivitydaily maximumreport only (umho/cm)all year
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year
pHdaily minimum≥ 6.8 SUall year
pHdaily maximum≤ 8.5 SUall year
pHdaily maximumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Salinitydaily maximumreport only (mg/L)all year
Salinitydaily maximumreport only (mg/L)all 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, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]7-day average≤ 12 mg/LApr–Oct
Nitrogen, ammonia total [as N]7-day average≤ 24 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LApr–Oct
Nitrogen, ammonia total [as N]30-day average≤ 8 mg/LJan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Cyanide, total [as CN]30-day average≤ 10 ug/Lall year
Chlorophyll Adaily maximumreport only (ug/L)all year
Chlorophyll Adaily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plant30-day average≤ 4.5 MGDall year
Chlorine, total residualdaily maximum≤ 13 ug/Lall year
Enterococciweekly geometric mean≤ 276 CFU/100mLall year
Enterococcimonthly geometric mean≤ 35 CFU/100mLall year
Enterococcidaily maximumreport only (CFU/100mL)all year
Enterococcidaily maximumreport only (CFU/100mL)all year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 18 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 37.5 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]30-day average≤ 12 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all 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/NC0025011 · MCP: https://passage-data.com/mcp