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Town of Queenstown

Sewage treatment plant, Queenstown, Maryland. NPDES permit MD0023370, in force until Aug 31, 2031. Last 12 months: over a limit 7 times (last February 2026), 15 required values missing, 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form C monthly (36 values), outfall 001 form B yearly, outfall 101 form A yearly
Last report on file
August 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
February 2026BOD, 5-day, 20 deg. C, maximum monthly average18.6 mg/L≤ 13 mg/L43%
February 2026BOD, 5-day, 20 deg. C, maximum monthly average18.6 mg/L≤ 13 mg/L43%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average37.66 lb/d≤ 32 lb/d18%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average37.66 lb/d≤ 32 lb/d18%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average63.6 mg/L≤ 19 mg/L235%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average63.6 mg/L≤ 19 mg/L235%
February 2026Nitrogen, ammonia total [as N], maximum daily average22 mg/L≤ 8.4 mg/L162%

Limits in force (51)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]minimum 7-day average≥ 6 mg/LFeb–May001
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/Lall year001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 13 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 19 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 21 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 32 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmaximum monthly average≤ 13 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 19 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 21 lb/dall year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Solids, total suspendedmaximum weekly average≤ 32 lb/dall year001
Solids, total suspendedannual maximum≤ 18265 lb/yrall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]annual maximum≤ 2435 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, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 8.8 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 2.4 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 7.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 3.7 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 14.7 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 4 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 12.5 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]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Phosphorus, total [as P]annual maximum≤ 183 lb/yrall year001
Phosphorus, total [as P]annual totalreport only (lb/yr)all year001
Phosphorus, total [as P]annual totalreport only (lb/yr)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< .1 mg/Lall year001
Coliform, fecal generalmaximum monthly geometric mean≤ 14 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Flow, totaltotalreport 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 May 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average2.8 lb/d (May–Oct)tighter0 lb/d (5 values)0×
Nitrogen, ammonia total [as N], maximum monthly average1.7 mg/L (May–Oct)tighter0 mg/L (5 values)0×
Nitrogen, ammonia total [as N], maximum monthly average5.4 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.035 mg/L (6 values)0.00648×
Nitrogen, ammonia total [as N], maximum monthly average9 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.0415 lb/d (6 values)0.00461×
Nitrogen, ammonia total [as N], maximum daily average2.3 mg/L (May–Oct)tighter0 mg/L (5 values)0×
Nitrogen, ammonia total [as N], maximum daily average3.8 lb/d (May–Oct)tighter0 lb/d (5 values)0×
Nitrogen, ammonia total [as N], maximum daily average5.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.135 mg/L (6 values)0.0241×
Nitrogen, ammonia total [as N], maximum daily average9.3 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.1125 lb/d (6 values)0.0121×

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/MD0023370 · MCP: https://passage-data.com/mcp