Walnut Ridge, City of - Walnut Ridge WWTP

NPDES permit AR0046566 · Major POTW · effective, expires 2027-12-31 · EPA's file as of 2026-09-19

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Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

73values over a limit
0required values missing, on 0 form(s)
0of 34 forms filed late

Last period with anything received: 2026-07-31. Most often over: Mercury, total recoverable (28), BOD, carbonaceous [5 day, 20 C] (21), Solids, total suspended (7).

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (81)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 15 mg/L all year
001Solids, total suspendedMO AVG <= 15 mg/L all year
001Solids, total suspended7 DA AVG <= 22.5 mg/L all year
001Solids, total suspended7 DA AVG <= 22.5 mg/L all year
001Solids, total suspendedMO AVG <= 148.9 lb/d all year
001Solids, total suspendedMO AVG <= 156.4 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 6 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 6 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]7 DA AVG <= 6 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]7 DA AVG <= 9 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]7 DA AVG <= 6 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]7 DA AVG <= 9 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 39.7 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 59.5 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 41.7 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 62.6 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]7 DA AVG report only all year
001Nitrite + Nitrate total [as N]7 DA AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]7 DA AVG report only all year
001Phosphorus, total [as P]7 DA AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plant7 DA AVG report only all year
001Chlorine, total residualINST MAX < .011 mg/L all year
001Peracetic AcidINST MAX <= 1 mg/L all year
001Peracetic AcidINST MAX <= 1 mg/L all year
001Mercury, total recoverableMO AVG <= .0134 ug/L all year
001Mercury, total recoverableMO AVG <= .0134 ug/L all year
001Mercury, total recoverable7 DA AVG <= .0269 ug/L all year
001Mercury, total recoverable7 DA AVG <= .0269 ug/L all year
001Mercury, total recoverableMO AVG <= .00013 lb/d all year
001Mercury, total recoverableMO AVG <= .00014 lb/d all year
001Coliform, fecal general30DA GEO <= 200 #/100mL May, Jun, Jul, Aug, Sep
001Coliform, fecal general30DA GEO <= 1000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Coliform, fecal general30DA GEO <= 1000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Coliform, fecal general30DA GEO <= 200 #/100mL May, Jun, Jul, Aug, Sep
001Coliform, fecal general7 DA GEO <= 400 #/100mL May, Jun, Jul, Aug, Sep
001Coliform, fecal general7 DA GEO <= 2000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Coliform, fecal general7 DA GEO <= 2000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Coliform, fecal general7 DA GEO <= 400 #/100mL May, Jun, Jul, Aug, Sep
001OverflowsMO TOTAL report only all year
001OverflowsMO TOTAL report only all year
001Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
001Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 99.2 lb/d all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 104.3 lb/d all year
TX1Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 100 % all year
TX1Whole Effluent Toxicity [WET] - P. promelas7 DA MIN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - P. promelas7 DA MIN >= 100 % all year
TX1Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year

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