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Sewage treatment plant, major discharger, Hillsboro, Texas. NPDES permit TX0023108, in force until Feb 19, 2031. Last 12 months: over a limit 12 times (last June 2026), 9 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| October 2025 | 001 | Nitrogen, ammonia total [as N], daily average | 2.17 mg/L | ≤ 1.3 mg/L | 67% |
| January 2026 | 001 | Solids, total suspended, daily average | 81.21 lb/d | ≤ 75 lb/d | 8% |
| January 2026 | 001 | Solids, total suspended, daily average | 9.63 mg/L | ≤ 5 mg/L | 93% |
| January 2026 | 001 | Solids, total suspended, daily maximum | 32 mg/L | ≤ 20 mg/L | 60% |
| February 2026 | 001 | Copper, total [as Cu], daily average | .0514 mg/L | ≤ .032 mg/L | 61% |
| February 2026 | 001 | Copper, total [as Cu], daily maximum | .187 mg/L | ≤ .069 mg/L | 171% |
| February 2026 | 001 | Solids, total suspended, daily average | 6 mg/L | ≤ 5 mg/L | 20% |
| March 2026 | 001 | Solids, total suspended, daily maximum | 23 mg/L | ≤ 20 mg/L | 15% |
| June 2026 | TX1 | Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum | 75 % | ≥ 100 % | 25% |
| June 2026 | TX1 | Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum | 75 % | ≥ 80 % | 6% |
| June 2026 | TX1 | Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum | 75 % | ≥ 100 % | 25% |
| June 2026 | TX1 | Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum | 75 % | ≥ 80 % | 6% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 6 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily average | ≤ 5 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily average | ≤ 75 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily average | ≤ 1.3 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily average | ≤ 20 lb/d | all year | 001 |
| Copper, total [as Cu] | daily average | ≤ .032 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .069 mg/L | all year | 001 |
| Copper, total [as Cu] | daily average | ≤ .48 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | 2-hour peak | ≤ 3676 gal/min | all year | 001 |
| Flow, in conduit or thru treatment plant | annual average | ≤ 1.81 MGD | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .1 mg/L | all year | 001 |
| Chlorine, total residual | monthly minimum | ≥ 1 mg/L | all year | 001 |
| E. coli | daily average | ≤ 126 CFU/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 399 CFU/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily average | ≤ 5 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily average | ≤ 75 lb/d | all year | 001 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 100 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - C. dubia | monthly average minimum | ≥ 100 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 80 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - C. dubia | monthly average minimum | ≥ 80 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 100 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - P. promelas | monthly average minimum | ≥ 100 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 80 % | all year | TX1 |
| Whole Effluent Toxicity [WET] - P. promelas | monthly average minimum | ≥ 80 % | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | single sample | report only (pass=0;fail=1) | all year | TXA |
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | single sample | report only (pass=0;fail=1) | all year | TXA |
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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