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Entergy Arkansas, LLC - Hot Spring Plant

Electric Services, major discharger, Malvern, Arkansas. NPDES permit AR0049417, in force until Aug 31, 2029. 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 01A form A monthly (4 values), outfall 01B form A monthly (2 values), outfall 01B form Q quarterly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 41 reports late

Limits in force (28)

ParameterStatisticLimitMonthsOutfall
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≤ 24.2 lb/dall year001
Oil & Greasedaily maximum≤ 36.3 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
Chlorine, free availablemonthly average≤ .2 mg/Lall year001
Chlorine, free availabledaily maximum≤ .5 mg/Lall year001
Chlorine, free availablemonthly average≤ .04 lb/dall year001
Chlorine, free availabledaily maximum≤ .1 lb/dall year001
pHminimum≥ 6 SUall year01A
pHmaximum≤ 9 SUall 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
Solids, total suspendedmonthly average≤ 30 mg/Lall year01B
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01B
Solids, total suspendedmonthly average≤ 2.3 lb/dall year01B
Solids, total suspendeddaily maximum≤ 7.6 lb/dall year01B
Oil & Greasemonthly average≤ 15 mg/Lall year01B
Oil & Greasedaily maximum≤ 20 mg/Lall year01B
Oil & Greasemonthly average≤ 1.1 lb/dall year01B
Oil & Greasedaily maximum≤ 1.5 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

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/AR0049417 · MCP: https://passage-data.com/mcp