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Arkansas Electric Cooperative Corporation - Harry L. Oswald Generating Station

Electric Services, major discharger, Wrightsville, Arkansas. NPDES permit AR0049255, in force until Feb 29, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form A monthly (12 values), outfall 002 form A monthly (12 values), outfall 01A form A monthly (12 values), outfall 01B form A monthly (16 values), outfall TX1 form Q quarterly (16 values), outfall TX2 form Q quarterly, and 2 more forms
Renewal application due
Sep 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 54 reports late

Limits in force (92)

ParameterStatisticLimitMonthsOutfall
Oxygen demand, chem. [low level] [COD]monthly averagereport only (mg/L)all year001
Oxygen demand, chem. [low level] [COD]daily maximumreport only (mg/L)all year001
Oxygen demand, chem. [low level] [COD]monthly averagereport only (lb/d)all year001
Oxygen demand, chem. [low level] [COD]daily maximumreport only (lb/d)all year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Oil & Greasemonthly average≤ 19.6 lb/dall year001
Oil & Greasedaily maximum≤ 29.4 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Oxygen demand, chem. [low level] [COD]monthly averagereport only (mg/L)all year002
Oxygen demand, chem. [low level] [COD]daily maximumreport only (mg/L)all year002
Oxygen demand, chem. [low level] [COD]monthly averagereport only (lb/d)all year002
Oxygen demand, chem. [low level] [COD]daily maximumreport only (lb/d)all year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasemonthly average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Oil & Greasemonthly average≤ 120.1 lb/dall year002
Oil & Greasedaily maximum≤ 180.1 lb/dall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
pHminimum≥ 6 SUall year01A
pHmaximum≤ 9 SUall year01A
Solids, total suspendedmonthly average≤ 30 mg/Lall year01A
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01A
Solids, total suspendedmonthly average≤ 4.8 lb/dall year01A
Solids, total suspendeddaily maximum≤ 16 lb/dall year01A
Oil & Greasemonthly average≤ 15 mg/Lall year01A
Oil & Greasedaily maximum≤ 20 mg/Lall year01A
Oil & Greasemonthly average≤ 2.4 lb/dall year01A
Oil & Greasedaily maximum≤ 3.2 lb/dall year01A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01A
pHminimum≥ 6 SUall year01B
pHmaximum≤ 9 SUall year01B
Zinc, total recoverablemonthly average≤ 0 mg/Lall year01B
Zinc, total recoverabledaily maximum≤ 0 mg/Lall year01B
Zinc, total recoverablemonthly average≤ 0 lb/dall year01B
Zinc, total recoverabledaily maximum≤ 0 lb/dall year01B
Chromium, total recoverablemonthly average≤ 0 mg/Lall year01B
Chromium, total recoverabledaily maximum≤ 0 mg/Lall year01B
Chromium, total recoverablemonthly average≤ 0 lb/dall year01B
Chromium, total recoverabledaily maximum≤ 0 lb/dall year01B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01B
Chlorine, free availablemonthly average≤ .2 mg/Lall year01B
Chlorine, free availabledaily maximum≤ .5 mg/Lall year01B
Chlorine, free availablemonthly average≤ .03 lb/dall year01B
Chlorine, free availabledaily maximum≤ .06 lb/dall year01B
Whole effluent toxicity - retest #17-day averagereport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day averagereport only (pass=0;fail=1)all yearTX1
WET, sublethal retest #17-day averagereport only (pass=0;fail=1)all yearTX1
WET, sublethal retest #27-day averagereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity - Retest #37-day averagereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity, Sub-Lethal Retest #37-day averagereport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX2
WET, sublethal retest #148-hour minimumreport only (pass=0;fail=1)all yearTX2
WET, sublethal retest #148-hour minimumreport only (pass=0;fail=1)all yearTX2
WET, sublethal retest #248-hour minimumreport only (pass=0;fail=1)all yearTX2
WET, sublethal retest #248-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole Effluent Toxicity - Retest #348-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole Effluent Toxicity - Retest #348-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole Effluent Toxicity, Sub-Lethal Retest #348-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole Effluent Toxicity, Sub-Lethal Retest #348-hour minimumreport only (pass=0;fail=1)all yearTX2
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all yearTX2
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all yearTX2
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX2
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX2
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX2
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX2
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all yearTX2
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all yearTX2
Coef Of Var Static Renewal 48Hr Acute D. pulex48-hour minimumreport only (%)all yearTX2
Coef Of Var Static Renewal 48Hr Acute D. pulex48-hour minimumreport only (%)all yearTX2
Coef Of Var Static Renewal 48Hr Acute D. pulex48-hour minimumreport only (%)all yearTX2
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX2

How strict are these limits?

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

Same industry: the 18 Electric Services permits in Arkansas.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0049255 · MCP: https://passage-data.com/mcp