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Cinnamon Woods Waste Water Treatment Plant

Industrial or other facility, Conowingo, Maryland. NPDES permit MD0069949, in force until Jul 31, 2031. Last 12 months: over a limit 16 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (25 values), outfall 101 form A yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], maximum monthly average.13 mg/L≤ .1 mg/L30%
October 2025Phosphorus, total [as P], maximum weekly average.23 mg/L≤ .15 mg/L53%
December 2025Nitrogen, ammonia total [as N], maximum monthly average6.02 mg/L≤ 3 mg/L101%
December 2025Nitrogen, ammonia total [as N], maximum daily average16.46 mg/L≤ 11 mg/L50%
January 2026Nitrogen, ammonia total [as N], maximum monthly average.79 lb/d≤ .55 lb/d44%
January 2026Nitrogen, ammonia total [as N], maximum monthly average23.88 mg/L≤ 3 mg/L696%
January 2026Nitrogen, ammonia total [as N], maximum daily average37.18 mg/L≤ 11 mg/L238%
February 2026Nitrogen, ammonia total [as N], maximum monthly average7.55 mg/L≤ 3 mg/L152%
February 2026Nitrogen, ammonia total [as N], maximum daily average18.14 mg/L≤ 11 mg/L65%
March 2026Nitrogen, ammonia total [as N], maximum monthly average8.2 mg/L≤ 3 mg/L173%
March 2026Nitrogen, ammonia total [as N], maximum daily average14.22 mg/L≤ 11 mg/L29%
June 2026Nitrogen, ammonia total [as N], maximum monthly average1.18 mg/L≤ 1 mg/L18%
July 2026Nitrogen, ammonia total [as N], maximum monthly average1.14 mg/L≤ 1 mg/L14%
July 2026Phosphorus, total [as P], maximum monthly average.128 mg/L≤ .1 mg/L28%
July 2026Phosphorus, total [as P], maximum weekly average.16 mg/L≤ .15 mg/L7%
August 2026Phosphorus, total [as P], maximum weekly average.2 mg/L≤ .15 mg/L33%

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5.5 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 8.3 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 5.5 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 8.3 lb/dall year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 9 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 11 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .18 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ .55 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 1.7 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 2 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]maximum monthly average≤ .1 mg/Lall year001
Phosphorus, total [as P]maximum weekly average≤ .15 mg/Lall year001
Phosphorus, total [as P]maximum monthly average≤ .018 lb/dall year001
Phosphorus, total [as P]maximum weekly average≤ .028 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmaximum≤ .1 mg/Lall year001
E. colimaximum monthly geometric mean≤ 126 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101

New limits from Feb 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum daily average5.2 mg/L (May–Oct)tighter0.45 mg/L (5 values)0.0865×
Nitrogen, ammonia total [as N], maximum daily average0.95 lb/d (May–Oct)tighter0.017 lb/d (5 values)0.0179×

How strict are these limits?

Cited limits by parameter: Maryland'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/MD0069949 · MCP: https://passage-data.com/mcp