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The City of Frederick

Sewage treatment plant, major discharger, Frederick, Maryland. NPDES permit MD0021610, in force until May 31, 2031. Last 12 months: over a limit 23 times (last August 2026), 1 of 19 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (46 values), outfall 002 form A monthly (3 values), outfall 101 form A monthly (2 values), outfall 001 form B yearly, outfall TRAD form E yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 1 required value missing, 1 of 14 reports late

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

All 23 values over a limit
Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], annual maximum9233.4 lb/yr≤ 7309 lb/yr26%
November 2025Phosphorus, total [as P], annual maximum10800.9 lb/yr≤ 7309 lb/yr48%
December 2025Phosphorus, total [as P], annual maximum10905 lb/yr≤ 7309 lb/yr49%
February 2026BOD, 5-day, 20 deg. C, maximum monthly average2752 lb/d≤ 1735 lb/d59%
February 2026BOD, 5-day, 20 deg. C, maximum monthly average51.1 mg/L≤ 26 mg/L97%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average101.5 mg/L≤ 39 mg/L160%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average5778.1 lb/d≤ 2600 lb/d122%
February 2026Solids, total suspended, maximum monthly average4858.4 lb/d≤ 1735 lb/d180%
February 2026Solids, total suspended, maximum monthly average87.3 mg/L≤ 26 mg/L236%
February 2026Solids, total suspended, maximum weekly average12099.9 lb/d≤ 2600 lb/d365%
February 2026Solids, total suspended, maximum weekly average212.6 mg/L≤ 39 mg/L445%
March 2026BOD, 5-day, 20 deg. C, maximum weekly average3081.6 lb/d≤ 2600 lb/d19%
March 2026BOD, 5-day, 20 deg. C, maximum weekly average55.7 mg/L≤ 39 mg/L43%
March 2026Phosphorus, total [as P], annual maximum8037.3 lb/yr≤ 7309 lb/yr10%
March 2026Solids, total suspended, maximum monthly average2706.3 lb/d≤ 1735 lb/d56%
March 2026Solids, total suspended, maximum monthly average38.5 mg/L≤ 26 mg/L48%
March 2026Solids, total suspended, maximum weekly average123.5 mg/L≤ 39 mg/L217%
March 2026Solids, total suspended, maximum weekly average6826.2 lb/d≤ 2600 lb/d163%
April 2026Phosphorus, total [as P], annual maximum9942.8 lb/yr≤ 7309 lb/yr36%
May 2026Phosphorus, total [as P], annual maximum10411 lb/yr≤ 7309 lb/yr42%
June 2026Phosphorus, total [as P], annual maximum11596.1 lb/yr≤ 7309 lb/yr59%
July 2026Phosphorus, total [as P], annual maximum12575.7 lb/yr≤ 7309 lb/yr72%
August 2026Phosphorus, total [as P], annual maximum13405.5 lb/yr≤ 7309 lb/yr83%

Limits in force (90)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LMay–Oct001
Oxygen, dissolved [DO]daily average minimum≥ 7 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 12 mg/LMay001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 26 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 8.7 mg/LJun–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 18 mg/LMay001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 39 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 13 mg/LJun–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 800 lb/dMay001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 1735 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 580 lb/dJun–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 1200 lb/dMay001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 2600 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 870 lb/dJun–Oct001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 26 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 39 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 1735 lb/dall year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Solids, total suspendedmaximum weekly average≤ 2600 lb/dall year001
Solids, total suspendedannual maximum≤ 632320 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≤ 97458 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≤ 12.7 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 3.9 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 846 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 261 lb/dMay–Oct001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ 2.6 mg/LJun–Oct001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ 6 mg/LMay001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 3.9 mg/LJun–Oct001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 9 mg/LMay001
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ 170 lb/dJun–Oct001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ 400 lb/dMay001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 260 lb/dJun–Oct001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 600 lb/dMay001
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec001
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≤ 7309 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
Benzo[a]pyrenequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
N-Nitrosodimethylamine [NDMA]quarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Dibenz[a,h]anthracenequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Benzidinequarterly 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
Chlorine, total residualmaximum≤ .1 mg/Lall year001
E. colimaximum monthly geometric mean≤ 126 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, totalmonthly totalreport only (MGD)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101
Solids, total suspendedcumulative totalreport only (lb/yr)all yearTRAD
Solids, total suspendedcumulative totalreport only (lb/yr)all yearTRAD
Solids, total suspendedcumulative totalreport only (lb/yr)all yearTRAD
Solids, total suspendedcumulative totalreport only (lb/yr)all yearTRAD
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all yearTRAD
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all yearTRAD
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all yearTRAD
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all yearTRAD
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all yearTRAD
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all yearTRAD
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all yearTRAD
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all yearTRAD
Flowyear-to-date totalreport only (Mgal/yr)all yearTRAD
Flowyear-to-date totalreport only (Mgal/yr)all yearTRAD

New limits from Dec 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average116 lb/d (May–Oct)tighter9.5 lb/d (5 values)0.0819×
Nitrogen, ammonia total [as N], maximum monthly average1.74 mg/L (May–Oct)tighter0.2 mg/L (5 values)0.115×
Nitrogen, ammonia total [as N], maximum monthly average398 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter——
Nitrogen, ammonia total [as N], maximum monthly average5.98 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter——

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/MD0021610 · MCP: https://passage-data.com/mcp