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Orange Water and Sewer Authority

Sewage treatment plant, major discharger, Chapel Hill, North Carolina. NPDES permit NC0025241, in force until Jul 31, 2030. Last 12 months: no values over a limit, 20 required values missing, 11 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 31 days after each period: form M monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 44 required values missing, 12 of 12 reports late

Limits in force (29)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Conductivitydaily maximumreport only (umho/cm)all year
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 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, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (lb/mo)all year
Nitrogen, ammonia total [as N]7-day average≤ 3 mg/LApr–Oct
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LApr–Oct
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, nitrate total [as N]30-day average≤ 10.4 mg/Lall year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]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 (lb/mo)all year
Coliform, fecal MF, MFC broth, 44.5 Cweekly geometric mean≤ 400 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 200 #/100mLall year
Flow, in conduit or thru treatment plant30-day average≤ 14.5 MGDall year
Chlorine, total residualdaily maximum≤ 18 ug/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 6 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]30-day average≤ 4 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]30-day average≤ 8 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
Flow, totaldaily maximumreport only (Mgal/mo)all year

How strict are these limits?

Cited limits by parameter: North 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/NC0025241 · MCP: https://passage-data.com/mcp