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College of Southern Maryland

Sewage treatment plant, La Plata, Maryland. NPDES permit MD0052311, in force until May 31, 2031. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (35 values), outfall 001 form B yearly, outfall 101 form A yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
4 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
March 2026Nitrogen, total [as N], maximum monthly average10.9 mg/L≤ 8.3 mg/L31%
March 2026Phosphorus, total [as P], maximum monthly average1 mg/L≤ .5 mg/L100%

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Oxygen, dissolved [DO]minimum≥ 7 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 10 mg/LMay–Sep001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 mg/LMay–Sep001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 15 lb/dJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5 lb/dMay–Sep001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 23 lb/dJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 7.5 lb/dMay–Sep001
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≤ 15 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 23 lb/dall year001
Nitrogen, total [as N]maximum monthly average≤ 8.3 mg/Lall year001
Nitrogen, total [as N]monthly total≤ 124 lb/moMay–Oct001
Nitrogen, total [as N]annual maximum≤ 1510 lb/yrall year001
Nitrogen, total [as N]annual totalreport only (lb/yr)all year001
Nitrogen, total [as N]annual totalreport only (lb/yr)all 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, organic total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ .5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 3.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 3.9 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≤ .6 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 1.6 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 2 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]maximum monthly average≤ .5 mg/Lall year001
Phosphorus, total [as P]annual maximum≤ 80 lb/yrall year001
Phosphorus, total [as P]monthly total≤ 7 lb/moMay–Oct001
Phosphorus, total [as P]annual totalreport only (lb/yr)all year001
Phosphorus, total [as P]annual totalreport only (lb/yr)all 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
Flow, totalannual totalreport only (Mgal/yr)all year001
Flow, totalannual totalreport only (Mgal/yr)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 Jun 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average0.1 lb/d (May–Oct)tighter0.0065 lb/d (4 values)0.065×
Nitrogen, ammonia total [as N], maximum monthly average0.2 mg/L (May–Oct)tighter0.15 mg/L (4 values)0.75×
Nitrogen, ammonia total [as N], maximum monthly average0.5 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.3 mg/L (3 values)0.6×
Nitrogen, ammonia total [as N], maximum monthly average0.3 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.03 lb/d (3 values)0.1×
Nitrogen, ammonia total [as N], maximum daily average0.9 mg/L (May–Oct)tighter0.6 mg/L (4 values)0.667×
Nitrogen, ammonia total [as N], maximum daily average0.5 lb/d (May–Oct)tighter0.02 lb/d (4 values)0.04×
Nitrogen, ammonia total [as N], maximum daily average1.3 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.21 lb/d (3 values)0.162×
Nitrogen, ammonia total [as N], maximum daily average2.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.8 mg/L (3 values)0.308×

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/MD0052311 · MCP: https://passage-data.com/mcp