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Washington County Department of Water Quality

Sewage treatment plant, Sandy Hook, Maryland. NPDES permit MD0064530, in force until Mar 31, 2029. Last 12 months: over a limit 10 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (22 values), outfall 101 form A monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], maximum monthly average4.8 mg/L≤ 1.9 mg/L153%
January 2026Nitrogen, ammonia total [as N], maximum daily average10.5 mg/L≤ 6.2 mg/L69%
February 2026Nitrogen, ammonia total [as N], maximum monthly average.7 lb/d≤ .33 lb/d112%
February 2026Nitrogen, ammonia total [as N], maximum monthly average25.6 mg/L≤ 1.9 mg/L1247%
February 2026Nitrogen, ammonia total [as N], maximum daily average33.9 mg/L≤ 6.2 mg/L447%
March 2026Nitrogen, ammonia total [as N], maximum monthly average.4 lb/d≤ .33 lb/d21%
March 2026Nitrogen, ammonia total [as N], maximum monthly average12.2 mg/L≤ 1.9 mg/L542%
March 2026Nitrogen, ammonia total [as N], maximum daily average22.7 mg/L≤ 6.2 mg/L266%
March 2026Solids, total suspended, maximum monthly average44.3 mg/L≤ 30 mg/L48%
March 2026Solids, total suspended, maximum weekly average106.5 mg/L≤ 45 mg/L137%

Limits in force (28)

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≤ 5.3 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 7.9 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≤ 5.3 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 7.9 lb/dall year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.6 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 8.1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 6.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .28 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ .33 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 1.4 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 1.1 lb/dJan, Feb, Mar, Apr, Nov, 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 residualinstantaneous maximum< .1 mg/Lall year001
E. colimaximum monthly geometric mean≤ 126 MPN/100mLall 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
Solids, total suspendedmonthly averagereport only (mg/L)all year101

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/MD0064530 · MCP: https://passage-data.com/mcp