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Natural Gas Transmission, City Of Houston, Texas. NPDES permit TX0134088 expired Mar 31, 2025; its limits still apply. Last 12 months: no values over a limit, 22 of 66 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 3 mg/L | Jan, Feb, Jul, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 4 mg/L | Mar–Jun | 001 |
| Oxygen, dissolved [DO] | mean | ≤ 5 mg/L | Jan, Feb, Jul, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | mean | ≤ 5 mg/L | Mar–Jun | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 001 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Carbon, tot organic [TOC] | monthly average | report only (mg/L) | all year | 001 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | 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 | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ 19 ug/L | all year | 001 |
| Free Oil Visual Sheen | monthly average | report only (d) | all year | 001 |
| Free Oil Visual Sheen | daily maximum | report only (d) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 002 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Carbon, tot organic [TOC] | monthly average | report only (mg/L) | all year | 002 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 002 |
| Free Oil Visual Sheen | monthly average | report only (d) | all year | 002 |
| Free Oil Visual Sheen | daily maximum | report only (d) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 003 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Carbon, tot organic [TOC] | monthly average | report only (mg/L) | all year | 003 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 003 |
| Free Oil Visual Sheen | monthly average | report only (d) | all year | 003 |
| Free Oil Visual Sheen | daily maximum | report only (d) | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 004 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Carbon, tot organic [TOC] | monthly average | report only (mg/L) | all year | 004 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 004 |
| Free Oil Visual Sheen | monthly average | report only (d) | all year | 004 |
| Free Oil Visual Sheen | daily maximum | report only (d) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 101 |
| pH | maximum | ≤ 9 SU | all year | 101 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 101 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 101 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 101 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 101 |
| Carbon, tot organic [TOC] | monthly average | report only (mg/L) | all year | 101 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 101 |
| Benzene | monthly average | report only (mg/L) | all year | 101 |
| Benzene | daily maximum | ≤ .005 mg/L | all year | 101 |
| BTEX | monthly average | report only (mg/L) | all year | 101 |
| BTEX | daily maximum | ≤ .1 mg/L | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 101 |
| Whole effluent toxicity - retest #1 | value | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | value | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #1 | value | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #2 | value | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity - Retest #3 | value | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | value | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | value | report only (%) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX1 |
| Whole effluent toxicity - retest #1 | value | report only (pass=0;fail=1) | all year | TX2 |
| Whole effluent toxicity - retest #2 | value | report only (pass=0;fail=1) | all year | TX2 |
| WET, sublethal retest #1 | value | report only (pass=0;fail=1) | all year | TX2 |
| WET, sublethal retest #2 | value | report only (pass=0;fail=1) | all year | TX2 |
| Whole Effluent Toxicity - Retest #3 | value | report only (pass=0;fail=1) | all year | TX2 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | value | report only (pass=0;fail=1) | all year | TX2 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX2 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX2 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX2 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX2 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX2 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX2 |
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX2 |
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | value | report only (%) | all year | TX2 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX2 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX2 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX2 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX2 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (%) | all year | TX2 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX2 |
| Whole effluent toxicity - retest #1 | value | report only (pass=0;fail=1) | all year | TX3 |
| Whole effluent toxicity - retest #2 | value | report only (pass=0;fail=1) | all year | TX3 |
| WET, sublethal retest #1 | value | report only (pass=0;fail=1) | all year | TX3 |
| WET, sublethal retest #2 | value | report only (pass=0;fail=1) | all year | TX3 |
| Whole Effluent Toxicity - Retest #3 | value | report only (pass=0;fail=1) | all year | TX3 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | value | report only (pass=0;fail=1) | all year | TX3 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX3 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX3 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX3 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX3 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX3 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX3 |
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX3 |
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | value | report only (%) | all year | TX3 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX3 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX3 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX3 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX3 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (%) | all year | TX3 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX3 |
| Whole effluent toxicity - retest #1 | value | report only (pass=0;fail=1) | all year | TX4 |
| Whole effluent toxicity - retest #2 | value | report only (pass=0;fail=1) | all year | TX4 |
| WET, sublethal retest #1 | value | report only (pass=0;fail=1) | all year | TX4 |
| WET, sublethal retest #2 | value | report only (pass=0;fail=1) | all year | TX4 |
| Whole Effluent Toxicity - Retest #3 | value | report only (pass=0;fail=1) | all year | TX4 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | value | report only (pass=0;fail=1) | all year | TX4 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX4 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX4 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX4 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX4 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX4 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX4 |
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX4 |
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | value | report only (%) | all year | TX4 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (pass=0;fail=1) | all year | TX4 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | value | report only (pass=0;fail=1) | all year | TX4 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | value | report only (%) | all year | TX4 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX4 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | value | report only (%) | all year | TX4 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | value | report only (%) | all year | TX4 |
Cited limits by parameter: Texas's rules and the federal ones.
Same industry: the 6 Natural Gas Transmission permits in Texas.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/TX0134088 · MCP: https://passage-data.com/mcp