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Garrett County Sanitary District, Inc.

Sewage treatment plant, major discharger, Oakland, Maryland. NPDES permit MD0054348, in force until Jul 31, 2031. Last 12 months: over a limit 6 times (last February 2026), 4 required values missing, 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (55 values), outfall 101 form A yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 8 required values missing, 5 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], maximum monthly average4.6 mg/L≤ 2.8 mg/L64%
January 2026Nitrogen, ammonia total [as N], maximum daily average13.8 mg/L≤ 6.1 mg/L126%
February 2026Nitrogen, ammonia total [as N], maximum monthly average26.7 mg/L≤ 2.8 mg/L854%
February 2026Nitrogen, ammonia total [as N], maximum monthly average91.2 lb/d≤ 35 lb/d161%
February 2026Nitrogen, ammonia total [as N], maximum daily average198.5 lb/d≤ 76 lb/d161%
February 2026Nitrogen, ammonia total [as N], maximum daily average57.5 mg/L≤ 6.1 mg/L843%

Limits in force (67)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 10 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≤ 15 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≤ 125 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 375 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 188 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 563 lb/dJan, Feb, Mar, Apr, Nov, Dec001
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≤ 375 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 563 lb/dall year001
Solids, total suspendedannual maximum≤ 136800 lb/yrall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.4 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.8 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 4.7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 6.1 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≤ 35 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 59 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 76 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≤ .9 mg/Lall year001
Phosphorus, total [as P]maximum weekly average≤ 1.4 mg/Lall year001
Phosphorus, total [as P]maximum monthly average≤ 11 lb/dall year001
Phosphorus, total [as P]maximum weekly average≤ 18 lb/dall year001
Phosphorus, total [as P]annual maximumreport only (lb/yr)all year001
Hardness, total [as CaCO3]minimum 7-day averagereport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]minimum 7-day averagereport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Arsenic, total [as As]quarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Copper, total recoverablemonthly averagereport only (mg/L)all year001
Acrylonitrilequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
N-Nitrosodi-N-propylaminequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
N-Nitrosodimethylamine [NDMA]quarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Benzidinequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
4,4'-DDTquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Aldrinquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Dieldrinquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Toxaphenequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Hexachlorobenzenequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlordanequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
E. colimonthly geometric mean≤ 126 MPN/100mLall year001
2,4-D SALTS AND ESTERSquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
PCBs Dry Weather Analysisquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Phosphorous, in total orthophosphatemonthly averagereport only (mg/L)all year001
Phosphorous, in total orthophosphatemonthly averagereport only (lb/d)all year001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
Flow, totalmonthly totalreport only (Mgal/mo)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 monthly average9.2 lb/d (May–Oct)tighter2 lb/d (5 values)0.217×
Nitrogen, ammonia total [as N], maximum monthly average0.5 mg/L (May–Oct)tighter0.5 mg/L (5 values)1×
Nitrogen, ammonia total [as N], maximum monthly average1.4 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.9 mg/L (6 values)0.643×
Nitrogen, ammonia total [as N], maximum monthly average26 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter3.05 lb/d (6 values)0.117×
Nitrogen, ammonia total [as N], maximum daily average2.2 mg/L (May–Oct)tighter0.5 mg/L (5 values)0.227×
Nitrogen, ammonia total [as N], maximum daily average40 lb/d (May–Oct)tighter2.6 lb/d (5 values)0.065×
Nitrogen, ammonia total [as N], maximum daily average5.9 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter2.95 mg/L (6 values)0.5×

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/MD0054348 · MCP: https://passage-data.com/mcp