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Dorchester Operating Company LLC

Crude Petroleum And Natural Gas, Fashing, Texas. NPDES permit TX0140153, in force until Mar 21, 2029. Last 12 months: no values over a limit, 48 of 78 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (9 values), outfall 002 form A monthly (9 values), outfall 003 form A monthly (9 values), outfall 004 form A monthly (9 values), outfall 005 form A monthly (9 values), outfall 006 form A monthly (9 values), and 6 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 60 of 84 reports late

Limits in force (78)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Oil & Greasedaily average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Chloride [as Cl]daily maximum≤ 500 mg/Lall year001
Tributyltindaily maximumreport only (mg/L)all year001
Flow, in conduit or thru treatment plantdaily average≤ .15834 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ .21 MGDall year001
Solids, total dissolveddaily maximum≤ 3000 mg/Lall year001
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasedaily average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Chloride [as Cl]daily maximum≤ 500 mg/Lall year002
Tributyltindaily maximumreport only (mg/L)all year002
Flow, in conduit or thru treatment plantdaily average≤ .13119 MGDall year002
Flow, in conduit or thru treatment plantdaily maximum≤ .378 MGDall year002
Solids, total dissolveddaily maximum≤ 3000 mg/Lall year002
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Oil & Greasedaily average≤ 10 mg/Lall year003
Oil & Greasedaily maximum≤ 15 mg/Lall year003
Chloride [as Cl]daily maximum≤ 500 mg/Lall year003
Tributyltindaily maximumreport only (mg/L)all year003
Flow, in conduit or thru treatment plantdaily average≤ .013508 MGDall year003
Flow, in conduit or thru treatment plantdaily maximum≤ .063 MGDall year003
Solids, total dissolveddaily maximum≤ 3000 mg/Lall year003
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Oil & Greasedaily average≤ 10 mg/Lall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Chloride [as Cl]daily maximum≤ 500 mg/Lall year004
Tributyltindaily maximumreport only (mg/L)all year004
Flow, in conduit or thru treatment plantdaily average≤ .022512 MGDall year004
Flow, in conduit or thru treatment plantdaily maximum≤ .126 MGDall year004
Solids, total dissolveddaily maximum≤ 3000 mg/Lall year004
pHminimum≥ 6 SUall year005
pHmaximum≤ 9 SUall year005
Oil & Greasedaily average≤ 10 mg/Lall year005
Oil & Greasedaily maximum≤ 15 mg/Lall year005
Chloride [as Cl]daily maximum≤ 500 mg/Lall year005
Tributyltindaily maximumreport only (mg/L)all year005
Flow, in conduit or thru treatment plantdaily average≤ .147 MGDall year005
Flow, in conduit or thru treatment plantdaily maximum≤ .659 MGDall year005
Solids, total dissolveddaily maximum≤ 3000 mg/Lall year005
pHminimum≥ 6 SUall year006
pHmaximum≤ 9 SUall year006
Oil & Greasedaily average≤ 10 mg/Lall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Chloride [as Cl]daily maximum≤ 500 mg/Lall year006
Tributyltindaily maximumreport only (mg/L)all year006
Flow, in conduit or thru treatment plantdaily average≤ .022512 MGDall year006
Flow, in conduit or thru treatment plantdaily maximum≤ .084 MGDall year006
Solids, total dissolveddaily maximum≤ 3000 mg/Lall year006
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXA
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXA
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXB
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXB
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXB
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXB
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXC
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXC
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXC
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXC
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXD
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXD
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXD
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXD
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXE
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXE
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXE
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXE
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXF
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXF
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXF
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXF

New limits from Apr 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Tributyltin, daily average outfall 0010.000109 mg/Lnew——
Tributyltin, daily maximum outfall 0010.000231 mg/Lnew——
Tributyltin, daily average outfall 0020.000109 mg/Lnew——
Tributyltin, daily maximum outfall 0020.000231 mg/Lnew0.00000342 mg/L (11 values, 6 below detection)—
Tributyltin, daily average outfall 0030.000109 mg/Lnew——
Tributyltin, daily maximum outfall 0030.000231 mg/Lnew——
Tributyltin, daily average outfall 0040.000109 mg/Lnew——
Tributyltin, daily maximum outfall 0040.000231 mg/Lnew0.00000335 mg/L (11 values, 5 below detection)0.0145×
Tributyltin, daily average outfall 0050.000109 mg/Lnew——
Tributyltin, daily maximum outfall 0050.000231 mg/Lnew0.00000356 mg/L (11 values, 3 below detection)0.0154×
Tributyltin, daily average outfall 0060.000109 mg/Lnew——
Tributyltin, daily maximum outfall 0060.000231 mg/Lnew——

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

Same industry: the 30 Oil and Gas Extraction permits in Texas.

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Your permit document is the final word. As JSON: /api/v1/permits/TX0140153 · MCP: https://passage-data.com/mcp