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W & P Development Corporation

Sewerage Systems, major discharger, Houston, Texas. NPDES permit TX0053023, in force until Jun 19, 2031. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form B monthly (143 values), outfall 002 form A monthly (6 values), outfall 003 form A monthly (6 values), outfall 004 form A monthly (6 values), outfall TX1 form Q quarterly, outfall TXA form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 53 reports late

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

Period endingOutfallParameterReportedLimitOver by
November 2025001Enterococci, daily maximum116 CFU/100mL≤ 104 CFU/100mL12%
May 2026001Oxygen demand, chem. [high level] [COD], daily maximum238 mg/L≤ 200 mg/L19%
May 2026001pH range excursions, > 60 minutes, monthly total1 occur/mo≤ 0 occur/mo—
June 2026002Carbon, tot organic [TOC], daily maximum130 mg/L≤ 75 mg/L73%

Limits in force (187)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cdaily average≤ 53 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 163 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily average≤ 1769 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 5440 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year001
pHminimum≥ 5 SUall year001
pHmaximum≤ 11 SUall year001
Solids, total suspendeddaily average≤ 11.3 mg/Lall year001
Solids, total suspendeddaily maximum≤ 29.6 mg/Lall year001
Solids, total suspendeddaily average≤ 377 lb/dall year001
Solids, total suspendeddaily maximum≤ 988 lb/dall year001
Oil & Greasedaily average≤ 38 mg/Lall year001
Oil & Greasedaily maximum≤ 127 mg/Lall year001
Oil & Greasedaily average≤ 1268 lb/dall year001
Oil & Greasedaily maximum≤ 4239 lb/dall year001
Cyanide, free [as free]daily averagereport only (mg/L)all year001
Cyanide, free [as free]daily minimumreport only (mg/L)all year001
Cyanide, free [as free]daily averagereport only (lb/d)all year001
Cyanide, free [as free]daily maximumreport only (lb/d)all year001
Arsenic, total [as As]daily average≤ .0199 mg/Lall year001
Arsenic, total [as As]daily maximum≤ .0993 mg/Lall year001
Arsenic, total [as As]daily average≤ .664 lb/dall year001
Arsenic, total [as As]daily maximum≤ 3.31 lb/dall year001
Cadmium, total [as Cd]daily average≤ .0102 mg/Lall year001
Cadmium, total [as Cd]daily maximum≤ .0172 mg/Lall year001
Cadmium, total [as Cd]daily average≤ .34 lb/dall year001
Cadmium, total [as Cd]daily maximum≤ .574 lb/dall year001
Chromium, total [as Cr]daily average≤ .0522 mg/Lall year001
Chromium, total [as Cr]daily maximum≤ .167 mg/Lall year001
Chromium, total [as Cr]daily average≤ 1.74 lb/dall year001
Chromium, total [as Cr]daily maximum≤ 5.57 lb/dall year001
Cobalt, total [as Co]daily average≤ .0703 mg/Lall year001
Cobalt, total [as Co]daily maximum≤ .182 mg/Lall year001
Cobalt, total [as Co]daily average≤ 2.34 lb/dall year001
Cobalt, total [as Co]daily maximum≤ 6.07 lb/dall year001
Copper, total [as Cu]daily average≤ .043 mg/Lall year001
Copper, total [as Cu]daily maximum≤ .0911 mg/Lall year001
Copper, total [as Cu]daily average≤ 1.43 lb/dall year001
Copper, total [as Cu]daily maximum≤ 3.04 lb/dall year001
Lead, total [as Pb]daily average≤ .154 mg/Lall year001
Lead, total [as Pb]daily maximum≤ .326 mg/Lall year001
Lead, total [as Pb]daily average≤ 5.14 lb/dall year001
Lead, total [as Pb]daily maximum≤ 10.8 lb/dall year001
Nickel, total [as Ni]daily average≤ .131 mg/Lall year001
Nickel, total [as Ni]daily maximum≤ .276 mg/Lall year001
Nickel, total [as Ni]daily average≤ 4.37 lb/dall year001
Nickel, total [as Ni]daily maximum≤ 9.21 lb/dall year001
Silver, total [as Ag]daily average≤ .0071 mg/Lall year001
Silver, total [as Ag]daily maximum≤ .0151 mg/Lall year001
Silver, total [as Ag]daily average≤ .239 lb/dall year001
Silver, total [as Ag]daily maximum≤ .505 lb/dall year001
Vanadium, total [as V]daily average≤ .0518 mg/Lall year001
Vanadium, total [as V]daily maximum≤ .0628 mg/Lall year001
Vanadium, total [as V]daily average≤ 1.72 lb/dall year001
Vanadium, total [as V]daily maximum≤ 2.09 lb/dall year001
Zinc, total [as Zn]daily average≤ .24 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ .509 mg/Lall year001
Zinc, total [as Zn]daily average≤ 8.04 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 17 lb/dall year001
Antimony, total [as Sb]daily average≤ .0312 mg/Lall year001
Antimony, total [as Sb]daily maximum≤ .111 mg/Lall year001
Antimony, total [as Sb]daily average≤ 1.04 lb/dall year001
Antimony, total [as Sb]daily maximum≤ 3.7 lb/dall year001
Tin, total [as Sn]daily average≤ .0367 mg/Lall year001
Tin, total [as Sn]daily maximum≤ .0955 mg/Lall year001
Tin, total [as Sn]daily average≤ 1.22 lb/dall year001
Tin, total [as Sn]daily maximum≤ 3.18 lb/dall year001
Selenium, total [as Se]daily average≤ .0698 mg/Lall year001
Selenium, total [as Se]daily maximum≤ .176 mg/Lall year001
Selenium, total [as Se]daily average≤ 2.32 lb/dall year001
Selenium, total [as Se]daily maximum≤ 5.87 lb/dall year001
Titanium, total [as Ti]daily average≤ .00612 mg/Lall year001
Titanium, total [as Ti]daily maximum≤ .0159 mg/Lall year001
Titanium, total [as Ti]daily average≤ .204 lb/dall year001
Titanium, total [as Ti]daily maximum≤ .53 lb/dall year001
Butyl benzyl phthalatedaily average≤ .0887 mg/Lall year001
Butyl benzyl phthalatedaily maximum≤ .188 mg/Lall year001
Butyl benzyl phthalatedaily average≤ 2.96 lb/dall year001
Butyl benzyl phthalatedaily maximum≤ 6.27 lb/dall year001
Fluoranthenedaily average≤ .0268 mg/Lall year001
Fluoranthenedaily maximum≤ .0537 mg/Lall year001
Fluoranthenedaily average≤ .894 lb/dall year001
Fluoranthenedaily maximum≤ 1.79 lb/dall year001
2,4,6-Trichlorophenoldaily average≤ .106 mg/Lall year001
2,4,6-Trichlorophenoldaily maximum≤ .155 mg/Lall year001
2,4,6-Trichlorophenoldaily average≤ 3.53 lb/dall year001
2,4,6-Trichlorophenoldaily maximum≤ 5.17 lb/dall year001
Phenoldaily average≤ 1.08 mg/Lall year001
Phenoldaily maximum≤ 3.65 mg/Lall year001
Phenoldaily average≤ 36 lb/dall year001
Phenoldaily maximum≤ 121 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .101 mg/Lall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .215 mg/Lall year001
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ 3.37 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 7.17 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ 4 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 8 MGDall year001
Chlorine, total residualmonthly minimum≥ .5 mg/Lall year001
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year001
Enterococcidaily average≤ 35 CFU/100mLall year001
Enterococcidaily maximum≤ 104 CFU/100mLall year001
Mercury, total [as Hg]daily average≤ .000246 mg/Lall year001
Mercury, total [as Hg]daily maximum≤ .000641 mg/Lall year001
Mercury, total [as Hg]daily average≤ .0082 lb/dall year001
Mercury, total [as Hg]daily maximum≤ .0214 lb/dall year001
Acetone, dry weightdaily average≤ 7.97 mg/Lall year001
Acetone, dry weightdaily maximum≤ 30.2 mg/Lall year001
Acetone, dry weightdaily average≤ 266 lb/dall year001
Acetone, dry weightdaily maximum≤ 1008 lb/dall year001
Pyridinedaily average≤ .182 mg/Lall year001
Pyridinedaily maximum≤ .37 mg/Lall year001
Pyridinedaily average≤ 6.07 lb/dall year001
Pyridinedaily maximum≤ 12.3 lb/dall year001
p-Cresoldaily average≤ .205 mg/Lall year001
p-Cresoldaily maximum≤ .698 mg/Lall year001
p-Cresoldaily average≤ 6.84 lb/dall year001
p-Cresoldaily maximum≤ 23.2 lb/dall year001
n-Decanedaily average≤ .437 mg/Lall year001
n-Decanedaily maximum≤ .948 mg/Lall year001
n-Decanedaily average≤ 14.5 lb/dall year001
n-Decanedaily maximum≤ 31.6 lb/dall year001
Carbazoledaily average≤ .276 mg/Lall year001
Carbazoledaily maximum≤ .598 mg/Lall year001
Carbazoledaily average≤ 9.21 lb/dall year001
Carbazoledaily maximum≤ 19.9 lb/dall year001
n-Octadecanedaily average≤ .302 mg/Lall year001
n-Octadecanedaily maximum≤ .589 mg/Lall year001
n-Octadecanedaily average≤ 10 lb/dall year001
n-Octadecanedaily maximum≤ 19.6 lb/dall year001
2-Butanonedaily average≤ 1.85 mg/Lall year001
2-Butanonedaily maximum≤ 4.81 mg/Lall year001
2-Butanonedaily average≤ 61.7 lb/dall year001
2-Butanonedaily maximum≤ 160 lb/dall year001
o-Cresol [2-Methylphenol]daily average≤ .561 mg/Lall year001
o-Cresol [2-Methylphenol]daily maximum≤ 1.92 mg/Lall year001
o-Cresol [2-Methylphenol]daily average≤ 18.7 lb/dall year001
o-Cresol [2-Methylphenol]daily maximum≤ 64 lb/dall year001
Acetophenonedaily average≤ .0562 mg/Lall year001
Acetophenonedaily maximum≤ .114 mg/Lall year001
Acetophenonedaily average≤ 1.87 lb/dall year001
Acetophenonedaily maximum≤ 3.8 lb/dall year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Carbon, tot organic [TOC]daily maximum≤ 75 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
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Oil & Greasedaily maximum≤ 15 mg/Lall year003
Carbon, tot organic [TOC]daily maximum≤ 75 mg/Lall year003
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Carbon, tot organic [TOC]daily maximum≤ 75 mg/Lall year004
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Menidia beryllinasingle samplereport only (pass=0;fail=1)all yearTXA

New limits from Jul 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Cyanide, free [as free], daily average0.00878 mg/Lnew——
Cyanide, free [as free], daily average0.293 lb/dnew——
Cyanide, free [as free], daily maximum0.0185 mg/Lnew——
Cyanide, free [as free], daily maximum0.618 lb/dnew——

How strict are these limits?

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

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