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Diamond Shamrock Refining Company, LP

Petroleum Refining, major discharger, Three Rivers, Texas. NPDES permit TX0088331 expired Nov 20, 2025; its limits still apply. Last 12 months: no values over a limit, 3 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (37 values), outfall 002 form A monthly (6 values), outfall TX1 form Q quarterly (20 values), outfall TXA form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 30 reports late

Limits in force (67)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year001
Oxygen demand, chem. [high level] [COD]daily average≤ 4605 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 8967 lb/dall year001
pHminimum≥ 5 SUall year001
pHmaximum≤ 11 SUall year001
Solids, total suspendeddaily average≤ 684 lb/dall year001
Solids, total suspendeddaily maximum≤ 1137 lb/dall year001
Oil & Greasedaily average≤ 255 lb/dall year001
Oil & Greasedaily maximum≤ 456 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 16 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 32 mg/Lall year001
Nitrogen, ammonia total [as N]daily average≤ 200 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 400 lb/dall year001
Sulfide, total [as S]daily average≤ 3.8 lb/dall year001
Sulfide, total [as S]daily maximum≤ 8.4 lb/dall year001
Chloride [as Cl]daily average≤ 20041 lb/dall year001
Chloride [as Cl]daily maximum≤ 42397 lb/dall year001
Chromium, hexavalent [as Cr]daily average≤ .169 lb/dall year001
Chromium, hexavalent [as Cr]daily maximum≤ .35 lb/dall year001
Chromium, total [as Cr]daily average≤ 9.9 lb/dall year001
Chromium, total [as Cr]daily maximum≤ 23.7 lb/dall year001
Selenium, total [as Se]daily averagereport only (mg/L)all year001
Selenium, total [as Se]daily maximumreport only (mg/L)all year001
Phenolsdaily average≤ 4.1 lb/dall year001
Phenolsdaily maximum≤ 8.5 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ 1.5 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 3 MGDall year001
Solids, total dissolveddaily average≤ 3562 mg/Lall year001
Solids, total dissolveddaily maximum≤ 5600 mg/Lall year001
Solids, total dissolveddaily average≤ 23400 lb/dall year001
Solids, total dissolveddaily maximum≤ 56074 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 47 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 94 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 588 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1177 lb/dall year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 150 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Whole effluent toxicity48-hour minimum≥ 27 %all yearTX1
Whole effluent toxicitymonthly average minimum≥ 27 %all yearTX1
Whole effluent toxicity48-hour minimum≥ 27 %all yearTX1
Whole effluent toxicitymonthly average minimum≥ 27 %all yearTX1
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all yearTX1
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX1
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX1
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all yearTX1
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all yearTX1
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex48-hour minimumreport only (%)all yearTX1
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulexmonthly average minimumreport only (%)all yearTX1
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX1
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (%)all yearTX1
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

How strict are these limits?

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

Same industry: the 32 Petroleum Refining and Related Industries 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/TX0088331 · MCP: https://passage-data.com/mcp