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Town of Hebron

Sewage treatment plant, Hebron, Maryland. NPDES permit MD0059617 expired Jul 31, 2026; its limits still apply. Last 12 months: over a limit 15 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (30 values), outfall 101 form A quarterly (6 values), outfall 201 form A quarterly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
15 values over a limit, 0 required values missing, 0 of 20 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], cumulative total433 lb/yr≤ 428 lb/yr1%
November 2025Phosphorus, total [as P], cumulative total476.2 lb/yr≤ 428 lb/yr11%
December 2025BOD, 5-day, 20 deg. C, maximum monthly average35.5 mg/L≤ 30 mg/L18%
December 2025BOD, 5-day, 20 deg. C, maximum monthly average41.6 lb/d≤ 25 lb/d66%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average52 mg/L≤ 45 mg/L16%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average62.4 lb/d≤ 38 lb/d64%
December 2025Phosphorus, total [as P], cumulative total498.2 lb/yr≤ 428 lb/yr16%
February 2026BOD, 5-day, 20 deg. C, maximum monthly average42.7 mg/L≤ 30 mg/L42%
February 2026BOD, 5-day, 20 deg. C, maximum monthly average43.3 lb/d≤ 25 lb/d73%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average76 mg/L≤ 45 mg/L69%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average83.6 lb/d≤ 38 lb/d120%
February 2026Enterococci, maximum45.2 MPN/100mL≤ 35 MPN/100mL29%
June 2026BOD, 5-day, 20 deg. C, maximum monthly average31 mg/L≤ 30 mg/L3%
July 2026Enterococci, maximum75 MPN/100mL≤ 35 MPN/100mL114%
August 2026Enterococci, maximum37.7 MPN/100mL≤ 35 MPN/100mL8%

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
Color [PT-CO units]monthly average≤ 158 col unit (pc)all year001
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≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 25 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 38 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 90 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 76 lb/dall 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]cumulative 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≤ 5.1 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≤ 4.2 lb/dMay–Oct001
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]cumulative total≤ 428 lb/yrall year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)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
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≤ .04 mg/Lall year001
Enterococcimaximum≤ 35 MPN/100mLall year001
Phosphorous, in total orthophosphatemonthly averagereport only (mg/L)all year001
Flow, totaltotalreport only (Mgal/mo)all year001
Oxygen, dissolved [DO]minimumreport only (mg/L)all year101
Oxygen, dissolved [DO]minimumreport only (mg/L)all year101
BOD, 5-day, 20 deg. Cquarterly averagereport only (mg/L)all year101
BOD, 5-day, 20 deg. Cquarterly averagereport only (mg/L)all year101
Enterococciquarterly averagereport only (MPN/100mL)all year101
Enterococciquarterly averagereport only (MPN/100mL)all year101
BOD, 5-day, 20 deg. Cquarterly averagereport only (mg/L)all year201
BOD, 5-day, 20 deg. Cquarterly averagereport only (mg/L)all year201
Enterococciquarterly averagereport only (MPN/100mL)all year201
Enterococciquarterly averagereport only (MPN/100mL)all year201

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0059617 · MCP: https://passage-data.com/mcp