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MT. Carmel Woods WWTP

Sewage treatment plant, La Plata, Maryland. NPDES permit MD0053228, in force until Dec 31, 2030. Last 12 months: over a limit 2 times (last July 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (41 values), outfall 101 form A yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026Solids, suspended percent removal, monthly average minimum54.7 %≥ 85 %202%
July 2026Chlorine, total residual, maximum.44 mg/L≤ .011 mg/L3900%

Limits in force (51)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 7 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 15 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 23 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 2.6 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5.2 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 3.9 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 7.9 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 7.8 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≤ 5.2 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 7.9 lb/dall year001
Nitrogen, total [as N]maximum monthly average≤ 18 mg/Lall year001
Nitrogen, total [as N]maximum weekly average≤ 27 mg/Lall year001
Nitrogen, total [as N]maximum monthly average≤ 3.2 lb/dall year001
Nitrogen, total [as N]maximum weekly average≤ 4.7 lb/dall year001
Nitrogen, total [as N]cumulative total≤ 1150 lb/yrall year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 3.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 12.1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 12.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .3 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ .5 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 2.1 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 2.1 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ 5 mg/LMay–Oct001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 7.5 mg/LMay–Oct001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ .9 lb/dMay–Oct001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 1.3 lb/dMay–Oct001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]maximum monthly average≤ 2 mg/Lall year001
Phosphorus, total [as P]maximum weekly average≤ 3 mg/Lall year001
Phosphorus, total [as P]maximum monthly average≤ .35 lb/dall year001
Phosphorus, total [as P]cumulative total≤ 128 lb/yrall year001
Phosphorus, total [as P]maximum weekly average≤ .52 lb/dall year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all 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≤ .011 mg/Lall year001
Coliform, fecal generalmonthly median≤ 14 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101

New limits from Jan 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average1.5 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter1.521 mg/L (6 values)1.01×
Nitrogen, ammonia total [as N], maximum monthly average0.62 mg/L (May–Oct)tighter0.7 mg/L (6 values)1.13×
Nitrogen, ammonia total [as N], maximum monthly average0.26 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.135 lb/d (6 values)0.519×
Nitrogen, ammonia total [as N], maximum monthly average0.11 lb/d (May–Oct)tighter0.038 lb/d (6 values)0.345×
Nitrogen, ammonia total [as N], maximum daily average9.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter2.763 mg/L (6 values)0.288×
Nitrogen, ammonia total [as N], maximum daily average1.7 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.242 lb/d (6 values)0.142×
Nitrogen, ammonia total [as N], maximum daily average3 mg/L (May–Oct)tighter1.314 mg/L (6 values)0.438×
Nitrogen, ammonia total [as N], maximum daily average0.53 lb/d (May–Oct)tighter0.084 lb/d (6 values)0.158×

How strict are these limits?

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

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