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Electric Services, major discharger, Sterlington, Louisiana. NPDES permit LA0112780, in force until Oct 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 99 deg F | all year | 001 |
| pH | instantaneous minimum | report only (SU) | all year | 001 |
| pH | instantaneous maximum | report only (SU) | all year | 001 |
| Chromium, total [as Cr] | monthly average | ≤ .2 mg/L | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ .2 mg/L | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 1 mg/L | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 1 mg/L | all year | 001 |
| Whole effluent toxicity - retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #2 | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole effluent toxicity - retest #2 | monthly average minimum | report only (pass=0;fail=1) | 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, free available | monthly average | ≤ .2 mg/L | all year | 001 |
| Chlorine, free available | daily maximum | ≤ .5 mg/L | all year | 001 |
| Whole Effluent Toxicity - Retest #3 | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole Effluent Toxicity - Retest #3 | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole Effluent Toxicity - Retest #3 | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Whole Effluent Toxicity - Retest #3 | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| pH range excursions, > 60 minutes | monthly total | ≤ 0 occur/mo | all year | 001 |
| pH range excursions, monthly total accum | monthly total | ≤ 446 min | all year | 001 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | 001 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | monthly average minimum | report only (%) | all year | 001 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | monthly average minimum | report only (%) | all year | 001 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 48-hour minimum | report only (%) | all year | 001 |
| Coef Of Var Static Renewal 48Hr Acute D. pulex | maximum | report only (%) | all year | 001 |
| Coef Of Var Static Renewal 48Hr Acute Pimephales promelas | maximum | report only (%) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 002 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 002 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (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 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 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 |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year | 003 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 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 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 201 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 201 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 201 |
| Solids, total suspended | daily maximum | ≤ 90 mg/L | all year | 201 |
| Solids, total suspended | daily maximum | ≤ 90 mg/L | all year | 201 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 201 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 201 |
| Lead, total [as Pb] | daily maximum | ≤ 50 ug/L | all year | 201 |
| Benzene | daily maximum | ≤ 50 ug/L | all year | 201 |
| BTEX | daily maximum | ≤ 250 ug/L | all year | 201 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 201 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 201 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 200 mg/L | all year | 301 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 300 mg/L | all year | 301 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 301 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 301 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 301 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 301 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 301 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 301 |
| Copper, total [as Cu] | monthly average | ≤ 1 mg/L | all year | 301 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 301 |
| Iron, total [as Fe] | monthly average | ≤ 1 mg/L | all year | 301 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 301 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 301 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 301 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | IT01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | IT01 |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Zinc, total [as Zn], monthly average outfall 001 | 0.48 mg/L | Nov 1, 2027 | tighter | 0.01 mg/L (12 values, 3 below detection) | 0.0208× |
| Copper, total [as Cu], daily maximum outfall 002 | 0.303 mg/L | Nov 1, 2027 | new | — | — |
| Copper, total [as Cu], monthly average outfall 002 | 0.128 mg/L | Nov 1, 2027 | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002A | 135.2 mg/L | Oct 31, 2029 | new | — | — |
| Nitrogen, ammonia total [as N], monthly average outfall 002A | 56.9 mg/L | Oct 31, 2029 | new | — | — |
Cited limits by parameter: Louisiana's rules and the federal ones.
Same industry: the 29 Electric Services permits in Louisiana.
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