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Tweetsie Railroad

Amusement And Recreation, Blowing Rock, North Carolina. NPDES permit NC0032131 expired Mar 31, 2026; its limits still apply. Last 12 months: over a limit 7 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 31 days after each period: form M monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average2.732 mg/L≤ 2 mg/L37%
October 2025Solids, total suspended, daily maximum25 mg/L≤ 15 mg/L67%
January 2026Solids, total suspended, 30-day average10.72 mg/L≤ 10 mg/L7%
January 2026Solids, total suspended, daily maximum27 mg/L≤ 15 mg/L80%
April 2026BOD, 5-day, 20 deg. C, 30-day average5.15 mg/L≤ 5 mg/L3%
June 2026BOD, 5-day, 20 deg. C, 30-day average5.35 mg/L≤ 5 mg/L7%
June 2026BOD, 5-day, 20 deg. C, daily maximum19.4 mg/L≤ 7.5 mg/L159%

Limits in force (18)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 5 mg/LApr–Oct
BOD, 5-day, 20 deg. C30-day average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 7.5 mg/LApr–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 15 mg/LJan, Feb, Mar, Nov, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 10 mg/Lall year
Solids, total suspendeddaily maximum≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LApr–Oct
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LApr–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan, Feb, Mar, Nov, Dec
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 400 #/100mLall year
Flow, in conduit or thru treatment plant30-day average≤ .07 MGDall year
Chlorine, total residualdaily maximum≤ 17 ug/Lall year

How strict are these limits?

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

Same industry: the 10 Amusement and Recreation Services permits in North Carolina.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NC0032131 · MCP: https://passage-data.com/mcp