SILOAM SPRINGS, CITY OF

NPDES permit AR0020273 · Major POTW · administratively continued, expires 2012-09-30 · 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.

This permit expired on 2012-09-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

10values over a limit
23required values missing, on 1 form(s)
1of 20 forms filed late

Last period with anything received: 2026-08-31. Most often over: Nitrogen, ammonia total [as N] (7), Phosphorus, total [as P] (2), Oxygen, dissolved [DO] (1).

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 (44)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO AV MN >= 7 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspended7 DA AVG <= 30 mg/L all year
001Solids, total suspendedMO AVG <= 734 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1.6 mg/L Apr
001Nitrogen, ammonia total [as N]7 DA AVG <= 2.3 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]7 DA AVG <= 6 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]7 DA AVG <= 3.9 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 55 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 147 lb/d Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 59 lb/d Apr
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]7 DA AVG <= 1.5 mg/L all year
001Phosphorus, total [as P]MO AVG <= 37 lb/d all year
001Copper, total recoverableMO AVG <= 15.21 ug/L all year
001Copper, total recoverable7 DA AVG <= 22.19 ug/L all year
001Copper, total recoverableMO AVG <= .56 lb/d 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
001Chlorine, total residualINST MAX <= .1 mg/L all year
001Nitrogen, nitrate total [as NO3]MO AVG report only all year
001Nitrogen, nitrate total [as NO3]7 DA AVG report only all year
001Nitrogen, nitrate total [as NO3]MO AVG report only all year
001Coliform, fecal general30DA GEO <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep
001Coliform, fecal general30DA GEO <= 1000 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001Coliform, fecal general7 DA GEO <= 400 #/100mL Apr, May, Jun, Jul, Aug, Sep
001Coliform, fecal general7 DA GEO <= 2000 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 22.5 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 550 lb/d all year
TX1Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA AVG report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA AVG report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA AVG report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA AVG report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA AVG report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states