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Sewerage Systems, Midlothian, Texas. NPDES permit TX0126616, in force until Feb 21, 2028. Last 12 months: over a limit 9 times (last July 2026), 5 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | E. coli, daily average | 308 CFU/100mL | ≤ 126 CFU/100mL | 144% |
| December 2025 | Solids, total suspended, daily average | 15.67 mg/L | ≤ 15 mg/L | 4% |
| February 2026 | E. coli, single grab sample | 2420 CFU/100mL | ≤ 399 CFU/100mL | 507% |
| February 2026 | Nitrogen, ammonia total [as N], daily average | 7.6 mg/L | ≤ 3 mg/L | 153% |
| June 2026 | Nitrogen, ammonia total [as N], daily average | 2.11 lb/d | ≤ 1.3 lb/d | 62% |
| June 2026 | Nitrogen, ammonia total [as N], daily average | 7.25 mg/L | ≤ 3 mg/L | 142% |
| June 2026 | Nitrogen, ammonia total [as N], single grab sample | 27.6 mg/L | ≤ 15 mg/L | 84% |
| July 2026 | Nitrogen, ammonia total [as N], daily average | 4.79 mg/L | ≤ 3 mg/L | 60% |
| July 2026 | Nitrogen, ammonia total [as N], single grab sample | 20.8 mg/L | ≤ 15 mg/L | 39% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 4 mg/L | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | daily average | ≤ 15 mg/L | all year |
| Solids, total suspended | single grab sample | ≤ 60 mg/L | all year |
| Solids, total suspended | daily average | ≤ 6.3 lb/d | all year |
| Nitrogen, ammonia total [as N] | daily average | ≤ 3 mg/L | all year |
| Nitrogen, ammonia total [as N] | single grab sample | ≤ 15 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily average | ≤ 1.3 lb/d | all year |
| Flow, in conduit or thru treatment plant | daily average | ≤ .05 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | monthly minimum | ≥ 1 mg/L | all year |
| Chlorine, total residual | monthly maximum | ≤ 4 mg/L | all year |
| E. coli | daily average | ≤ 126 CFU/100mL | all year |
| E. coli | single grab sample | ≤ 399 CFU/100mL | all year |
| BOD, carbonaceous [5 day, 20 C] | daily average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | single grab sample | ≤ 35 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily average | ≤ 4.2 lb/d | all year |
Cited limits by parameter: Texas'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/TX0126616 · MCP: https://passage-data.com/mcp