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Sewage treatment plant, major discharger, La Plata, Maryland. NPDES permit MD0020524, in force until Aug 31, 2028. Last 12 months: over a limit 16 times (last July 2026), 2 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, total [as N], cumulative total | 18439 lb/yr | ≤ 18273 lb/yr | 1% |
| January 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 2.8 mg/L | ≤ 1.6 mg/L | 75% |
| January 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 25 lb/d | ≤ 20 lb/d | 25% |
| February 2026 | Coliform, fecal general, median | 167 MPN/100mL | ≤ 14 MPN/100mL | 1093% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 4.3 mg/L | ≤ 1.6 mg/L | 169% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 52 lb/d | ≤ 20 lb/d | 160% |
| March 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 2.9 mg/L | ≤ 1.6 mg/L | 81% |
| March 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 29 lb/d | ≤ 20 lb/d | 45% |
| April 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 27 lb/d | ≤ 20 lb/d | 35% |
| April 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 3.2 mg/L | ≤ 1.6 mg/L | 100% |
| June 2026 | Coliform, fecal general, median | 29 MPN/100mL | ≤ 14 MPN/100mL | 107% |
| June 2026 | Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L | ≤ 3.2 mg/L | 3% |
| June 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 1 mg/L | ≤ .7 mg/L | 43% |
| June 2026 | Oxygen, dissolved [DO], instantaneous minimum | 6.81 mg/L | ≥ 7 mg/L | 3% |
| June 2026 | Phosphorus, total [as P], monthly total | 73 lb/mo | ≤ 68 lb/mo | 7% |
| July 2026 | Phosphorus, total [as P], monthly total | 81 lb/mo | ≤ 68 lb/mo | 19% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 7 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 15 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 | ≤ 23 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 | ≤ 188 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 282 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 375 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 563 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 | ≤ 375 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 563 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 137050 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] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | ≤ 18273 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly total | ≤ 1355 lb/mo | May–Oct | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.3 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.8 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 10 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 12 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 16 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 35 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 125 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 150 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 8.8 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 20 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 126.4 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 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 total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 1370 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly total | ≤ 68 lb/mo | May–Oct | 001 |
| Hardness, total [as CaCO3] | daily average minimum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily average minimum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily average minimum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | quarterly average | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | quarterly average | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 62 ug/L | all year | 001 |
| Cadmium, total recoverable | quarterly average | report only (mg/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 4.7 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 6.6 ug/L | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Acrolein | quarterly average | report only (mg/L) | all year | 001 |
| Benzo[k]fluoranthene | quarterly average | report only (ug/L) | all year | 001 |
| Benzo[a]pyrene | quarterly average | report only (ug/L) | all year | 001 |
| Chrysene | quarterly average | report only (ug/L) | all year | 001 |
| Indeno[1,2,3-cd]pyrene | quarterly average | report only (ug/L) | all year | 001 |
| Benzo[a]anthracene | quarterly average | report only (ug/L) | all year | 001 |
| Dibenzo[a,h]anthracene, dry weight | quarterly average | report only (ug/L) | all year | 001 |
| Benzidine | quarterly average | report only (ug/L) | all year | 001 |
| 4,4'-DDT | quarterly average | report only (ug/L) | all year | 001 |
| Toxaphene | quarterly average | report only (ug/L) | all year | 001 |
| Heptachlor | quarterly average | report only (mg/L) | all year | 001 |
| Polychlorinated biphenyls [PCBs] | annual average | report only (ng/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCBs] | annual maximum | report only (g/yr) | 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 | monthly maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | maximum | < .011 mg/L | all year | 001 |
| Chlordane | quarterly average | report only (ug/L) | all year | 001 |
| Heptachlor + Heptachlor Epoxide | quarterly average | report only (mg/L) | all year | 001 |
| Coliform, fecal general | median | ≤ 14 MPN/100mL | all year | 001 |
| 3,4-Benzofluoranthene | quarterly average | report only (ug/L) | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | 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 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| 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 |
Cited limits by parameter: Maryland's rules and the federal ones.
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