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Sewerage Systems, Grantsville, Maryland. NPDES permit MD0069418, in force until May 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | maximum | ≤ 68 deg F (alert, not enforceable) | all year | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) (alert, not enforceable) | all year | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) (alert, not enforceable) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 8 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 12 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 1.7 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 2.5 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 10 mL/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 15 mL/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 2.1 lb/d | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 3.1 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 1600 lb/yr | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 2.1 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 2.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .1 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .2 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ .4 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ .4 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Benzo[a]pyrene | monthly average | report only (ug/L) | all year | 001 |
| Dibenz[a,h]anthracene | monthly average | report only (ug/L) | all year | 001 |
| 4,4'-DDT | monthly average | report only (ug/L) | all year | 001 |
| Aldrin | monthly average | report only (ug/L) | all year | 001 |
| Dieldrin | monthly average | report only (ug/L) | all year | 001 |
| Toxaphene | monthly average | report only (ug/L) | all year | 001 |
| Heptachlor epoxide | monthly average | report only (ug/L) | all year | 001 |
| Polychlorinated biphenyls [PCBs] | monthly average | report only (ug/L) | all year | 001 |
| Hexachlorobenzene | monthly average | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 001 |
| Chlorine, total residual | minimum | ≥ .1 mg/L | all year | 001 |
| E. coli | maximum | ≤ 126 MPN/100mL | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | maximum | ≤ 68 deg F | all year | 002 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 002 |
| Conductivity | monthly average | report only (umho/cm) | all year | 002 |
| Conductivity | monthly average | report only (umho/cm) | all year | 002 |
| Conductivity | monthly average | report only (umho/cm) | all year | 002 |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 8 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 12 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 1.7 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 2.5 lb/d | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 8.5 SU | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 10 mg/L | all year | 002 |
| Solids, total suspended | maximum daily average | ≤ 15 mg/L | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 2.1 lb/d | all year | 002 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 3.1 lb/d | all year | 002 |
| Solids, total suspended | annual maximum | ≤ 1600 lb/yr | all year | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .7 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 2.1 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 2.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .1 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .2 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ .4 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ .4 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Benzo[a]pyrene | monthly average | report only (ug/L) | all year | 002 |
| Dibenz[a,h]anthracene | monthly average | report only (ug/L) | all year | 002 |
| 4,4'-DDT | monthly average | report only (ug/L) | all year | 002 |
| Aldrin | monthly average | report only (ug/L) | all year | 002 |
| Dieldrin | monthly average | report only (ug/L) | all year | 002 |
| Toxaphene | monthly average | report only (ug/L) | all year | 002 |
| Heptachlor epoxide | monthly average | report only (ug/L) | all year | 002 |
| Polychlorinated biphenyls [PCBs] | monthly average | report only (ug/L) | all year | 002 |
| Hexachlorobenzene | monthly average | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | minimum | ≥ .1 mg/L | all year | 002 |
| E. coli | maximum | ≤ 126 MPN/100mL | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average outfall 001 | 0.1 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum monthly average outfall 001 | 0.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum monthly average outfall 001 | 0.4 mg/L (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum daily average outfall 001 | 2 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum daily average outfall 001 | 0.3 lb/d (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum daily average outfall 001 | 1.6 mg/L (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum monthly average outfall 002 | 0.4 mg/L (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum monthly average outfall 002 | 0.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum monthly average outfall 002 | 0.1 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum daily average outfall 002 | 1.6 mg/L (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum daily average outfall 002 | 0.3 lb/d (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], maximum daily average outfall 002 | 2 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | — | — |
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/MD0069418 · MCP: https://passage-data.com/mcp