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Calvert County Board of Education

Elementary And Secondary Schools, Owings, Maryland. NPDES permit MD0052167, in force until Jul 31, 2030. Last 12 months: over a limit 10 times (last June 2026), 2 of 22 reports late. 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 monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 0 of 14 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], maximum monthly average1.5 lb/d≤ .75 lb/d100%
October 2025Nitrogen, ammonia total [as N], maximum monthly average9.6 mg/L≤ 3.6 mg/L167%
January 2026Solids, total suspended, maximum weekly average15.15 lb/d≤ 9.4 lb/d61%
February 2026Solids, suspended percent removal, monthly average minimum72.254 %≥ 85 %85%
February 2026Solids, total suspended, maximum monthly average14.19 lb/d≤ 6.3 lb/d125%
February 2026Solids, total suspended, maximum weekly average19.42 lb/d≤ 9.4 lb/d107%
April 2026Solids, total suspended, maximum weekly average9.5 lb/d≤ 9.4 lb/d1%
May 2026Nitrogen, ammonia total [as N], maximum monthly average.98 lb/d≤ .75 lb/d31%
May 2026Nitrogen, ammonia total [as N], maximum monthly average5.3 mg/L≤ 3.6 mg/L47%
June 2026pH, minimum6.1 SU≥ 6.5 SU—

Limits in force (29)

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≤ 6.3 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 9.4 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≤ 6.3 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 9.4 lb/dall 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≤ 3.6 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .75 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)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< .019 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
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101

New limits from Feb 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average1.6 mg/L (May–Oct)tighter0.7 mg/L (5 values)0.437×
Nitrogen, ammonia total [as N], maximum monthly average0.33 lb/d (May–Oct)tighter0.08 lb/d (5 values)0.242×

How strict are these limits?

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

Same industry: the 20 Educational Services permits in Maryland.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0052167 · MCP: https://passage-data.com/mcp