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Sewage treatment plant, major discharger, Thurmont, Maryland. NPDES permit MD0021121, in force until May 31, 2031. Last 12 months: over a limit 2 times (last February 2026), 18 required values missing, 3 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 4.48 mg/L | ≤ 3.7 mg/L | 21% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 43.38 lb/d | ≤ 31 lb/d | 40% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Jun–Aug | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jun–Aug | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Jun–Aug | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jun–Aug | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Jun–Aug | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Jun–Aug | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 26 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 39 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 217 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 250 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 326 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 376 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 250 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 376 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 91367 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 12180 lb/yr | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 8 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 11 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 67 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 92 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 14 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 31 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 914 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| N-Nitrosodimethylamine [NDMA] | quarterly average | report only (mg/L) | all year | 001 |
| Benzidine | quarterly average | report only (mg/L) | all year | 001 |
| 4,4'-DDT | quarterly average | report only (mg/L) | all year | 001 |
| 4,4'-DDD | quarterly average | report only (mg/L) | all year | 001 |
| 4,4'-DDE | quarterly average | report only (mg/L) | all year | 001 |
| Aldrin | quarterly average | report only (mg/L) | all year | 001 |
| Dieldrin | quarterly average | report only (mg/L) | all year | 001 |
| Heptachlor | quarterly average | report only (mg/L) | all year | 001 |
| Heptachlor epoxide | quarterly average | report only (mg/L) | all year | 001 |
| Polychlorinated biphenyls [PCBs] | quarterly average | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlordane | quarterly average | report only (mg/L) | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 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 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| 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 |
| Solids, total suspended | cumulative total | report only (lb/yr) | all year | TRAD |
| Solids, total suspended | cumulative total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | TRAD |
| Flow | year-to-date total | report only (Mgal/yr) | all year | TRAD |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average | 17 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 2.465 lb/d (6 values) | 0.145× |
| Nitrogen, ammonia total [as N], maximum monthly average | 2 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.125 mg/L (6 values) | 0.0625× |
| Nitrogen, ammonia total [as N], maximum monthly average | 0.6 mg/L (May–Oct) | tighter | 0.02 mg/L (6 values) | 0.0333× |
| Nitrogen, ammonia total [as N], maximum daily average | 9.2 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.485 mg/L (6 values) | 0.0527× |
| Nitrogen, ammonia total [as N], maximum daily average | 77 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.725 lb/d (6 values) | 0.00942× |
| Nitrogen, ammonia total [as N], maximum daily average | 2 mg/L (May–Oct) | tighter | 0.03 mg/L (6 values) | 0.015× |
| Nitrogen, ammonia total [as N], maximum daily average | 5 lb/d (May–Oct) | tighter | 0.12 lb/d (4 values) | 0.024× |
Cited limits by parameter: Maryland's rules and the federal ones.
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