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Sewerage Systems, Trinity, Texas. NPDES permit TX0101885, in force until May 6, 2027. Last 12 months: over a limit 2 times (last December 2025), 1 required value missing, 8 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, 5-day, 20 deg. C, daily average | 12 mg/L | ≤ 10 mg/L | 20% |
| December 2025 | BOD, 5-day, 20 deg. C, single grab sample | 36 mg/L | ≤ 35 mg/L | 3% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 4 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily average | ≤ 10 mg/L | all year |
| BOD, 5-day, 20 deg. C | single grab sample | ≤ 35 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily average | ≤ .83 lb/d | 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 | ≤ 1.25 lb/d | all year |
| Flow, in conduit or thru treatment plant | daily average | ≤ .01 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 MPN/100mL | all year |
| E. coli | single grab sample | ≤ 399 MPN/100mL | all year |
Cited limits by parameter: Texas's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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