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Weatherford US LP

Commercial Physical Research, Houston, Texas. NPDES permit TX0089940, in force until Sep 5, 2029. Last 12 months: over a limit 4 times (last June 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (33 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 1 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025E. coli, daily maximum533.5 MPN/100mL≤ 199 MPN/100mL168%
May 2026E. coli, daily average> 4.75 MPN/100mL≤ 63 MPN/100mL—
May 2026E. coli, daily maximum> 2420 MPN/100mL≤ 199 MPN/100mL—
June 2026E. coli, daily maximum866 MPN/100mL≤ 199 MPN/100mL335%

Limits in force (33)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 40 mg/Lall year
Solids, total suspendeddaily average≤ 1.4 lb/dall year
Solids, total suspendeddaily maximum≤ 3.6 lb/dall year
Oil & Greasedaily average≤ 15 mg/Lall year
Oil & Greasedaily maximum≤ 20 mg/Lall year
Oil & Greasedaily average≤ 1.35 lb/dall year
Oil & Greasedaily maximum≤ 1.8 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ .18 lb/dall year
Nitrogen, ammonia total [as N]daily maximum≤ .9 lb/dall year
Carbon, tot organic [TOC]daily maximum≤ 75 mg/Lall year
Carbon, tot organic [TOC]daily maximum≤ 6.75 lb/dall year
Copper, total [as Cu]daily average≤ .0903 mg/Lall year
Copper, total [as Cu]daily maximum≤ .191 mg/Lall year
Copper, total [as Cu]daily average≤ .0081 lb/dall year
Copper, total [as Cu]daily maximum≤ .017 lb/dall year
Zinc, total [as Zn]daily average≤ .216 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .458 mg/Lall year
Flow, in conduit or thru treatment plantdaily average≤ .0108 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .0432 MGDall year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
E. colidaily average≤ 63 MPN/100mLall year
E. colidaily maximum≤ 199 MPN/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ .9 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2.2 lb/dall year

New limits from Oct 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Copper, total [as Cu], daily average0.0173 mg/Ltighter0.00698 mg/L (12 values, 2 below detection)0.403×
Copper, total [as Cu], daily average0.0016 lb/dtighter0.0001319 lb/d (12 values)0.0824×
Copper, total [as Cu], daily maximum0.0033 lb/dtighter0.0003405 lb/d (12 values)0.103×
Copper, total [as Cu], daily maximum0.0367 mg/Ltighter0.00907 mg/L (12 values, 2 below detection)0.247×
Zinc, total [as Zn], daily average0.192 mg/Ltighter0.0248 mg/L (12 values, 2 below detection)0.129×
Zinc, total [as Zn], daily maximum0.408 mg/Ltighter0.0292 mg/L (12 values, 2 below detection)0.0716×

How strict are these limits?

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

Same industry: the 3 Engineering, Accounting, Research and Management Services permits in Texas.

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