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Ready-Mixed Concrete, Washington, the District of Columbia. NPDES permit DC0000175 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 21 times (last June 2026), 8 required values missing, 4 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 3.5 toxic | ≤ 1.6 toxic | 119% |
| October 2025 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 3.5 toxic | ≤ 1.6 toxic | 119% |
| October 2025 | Toxicity [chronic], Ceriodaphnia dubia, monthly average | 3.5 toxic | ≤ 1.1 toxic | 218% |
| October 2025 | Toxicity [chronic], Ceriodaphnia dubia, monthly average | 3.5 toxic | ≤ 1.1 toxic | 218% |
| October 2025 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.5 toxic | ≤ 1.1 toxic | 36% |
| October 2025 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.5 toxic | ≤ 1.1 toxic | 36% |
| November 2025 | BOD, 5-day, 20 deg. C, monthly average | 17.9 mg/L | ≤ 15 mg/L | 19% |
| December 2025 | BOD, 5-day, 20 deg. C, monthly average | 17.2 mg/L | ≤ 15 mg/L | 15% |
| December 2025 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 3.5 toxic | ≤ 1.6 toxic | 119% |
| December 2025 | Toxicity [chronic], Ceriodaphnia dubia, monthly average | 3.5 toxic | ≤ 1.1 toxic | 218% |
| December 2025 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.5 toxic | ≤ 1.1 toxic | 36% |
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 16.78 mg/L | ≤ 15 mg/L | 12% |
| March 2026 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 4.8 toxic | ≤ 1.6 toxic | 200% |
| March 2026 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 4.8 toxic | ≤ 1.6 toxic | 200% |
| March 2026 | Toxicity [chronic], Ceriodaphnia dubia, monthly average | 4.8 toxic | ≤ 1.1 toxic | 336% |
| March 2026 | Toxicity [chronic], Ceriodaphnia dubia, monthly average | 4.8 toxic | ≤ 1.1 toxic | 336% |
| March 2026 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.5 toxic | ≤ 1.1 toxic | 36% |
| March 2026 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.5 toxic | ≤ 1.1 toxic | 36% |
| June 2026 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 2.2 toxic | ≤ 1.6 toxic | 38% |
| June 2026 | Toxicity [chronic], Ceriodaphnia dubia, monthly average | 2.2 toxic | ≤ 1.1 toxic | 100% |
| June 2026 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.5 toxic | ≤ 1.1 toxic | 36% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 15 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 30 mg/L | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | monthly average | ≤ 23.4 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 46.6 mg/L | all year |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year |
| Arsenic, total [as As] | maximum | ≤ .14 ug/L (alert, not enforceable) | all year |
| Copper, total [as Cu] | maximum | ≤ 8.96 ug/L (alert, not enforceable) | all year |
| Lead, total [as Pb] | maximum | ≤ 2.52 ug/L (alert, not enforceable) | all year |
| Zinc, total [as Zn] | maximum | ≤ 117.2 ug/L (alert, not enforceable) | all year |
| Polynuclear Aromatic Hydrocarbons [PAHs] | maximum | ≤ 610 ug/L (alert, not enforceable) | all year |
| 4,4'-DDD | maximum | ≤ .00012 ug/L (alert, not enforceable) | all year |
| DDE | maximum | ≤ .000018 ug/L (alert, not enforceable) | all year |
| DDT | maximum | ≤ .00003 ug/L (alert, not enforceable) | all year |
| Dieldrin | maximum | ≤ .0000012 ug/L (alert, not enforceable) | all year |
| Heptachlor epoxide | maximum | ≤ .000032 ug/L (alert, not enforceable) | all year |
| Polychlorinated biphenyls [PCBs] | maximum | ≤ .000064 ug/L (alert, not enforceable) | all year |
| Flow, in conduit or thru treatment plant | monthly average minimum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlordane | maximum | ≤ .00032 ug/L (alert, not enforceable) | all year |
| Nitrogen, Total | monthly average | report only (mg/L) (alert, not enforceable) | all year |
| Nitrogen, Total | daily maximum | report only (mg/L) (alert, not enforceable) | all year |
| Phosphorus, Total | monthly average | report only (mg/L) (alert, not enforceable) | all year |
| Phosphorus, Total | daily maximum | report only (mg/L) (alert, not enforceable) | all year |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average | ≤ 1.1 toxic | all year |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.6 toxic | all year |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average | ≤ 1.1 toxic | all year |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.6 toxic | all year |
Cited limits by parameter: the District of Columbia'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/DC0000175 · MCP: https://passage-data.com/mcp