NPDES permit AR0021768 · Major POTW · effective, expires 2028-07-31 · EPA's file as of 2026-09-19
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Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (6), Solids, total suspended (3), BOD, carbonaceous [5 day, 20 C] (2).
Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).
| Outfall | Parameter | Statistic | Limit | Months |
|---|---|---|---|---|
| 001 | Oxygen, dissolved [DO] | INST MIN | >= 6 mg/L | all year |
| 001 | Oxygen, dissolved [DO] | INST MIN | >= 6 mg/L | all year |
| 001 | pH | MINIMUM | >= 6 SU | all year |
| 001 | pH | MINIMUM | >= 6 SU | all year |
| 001 | pH | MAXIMUM | <= 9 SU | all year |
| 001 | pH | MAXIMUM | <= 9 SU | all year |
| 001 | Solids, total suspended | MO AVG | <= 15 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | Solids, total suspended | MO AVG | <= 20 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | Solids, total suspended | MO AVG | <= 15 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | Solids, total suspended | MO AVG | <= 20 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | Solids, total suspended | 7 DA AVG | <= 22.5 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | Solids, total suspended | 7 DA AVG | <= 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | Solids, total suspended | 7 DA AVG | <= 22.5 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | Solids, total suspended | 7 DA AVG | <= 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | Solids, total suspended | MO AVG | <= 913.2 lb/d | May, Jun, Jul, Aug, Sep, Oct |
| 001 | Solids, total suspended | MO AVG | <= 1217.6 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | Solids, total suspended | MO AVG | <= 1063.4 lb/d | May, Jun, Jul, Aug, Sep, Oct |
| 001 | Solids, total suspended | MO AVG | <= 1417.8 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | <= 2.2 mg/L | Apr, May, Jun, Jul, Aug, Sep, Oct |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | <= 4 mg/L | Jan, Feb, Mar, Nov, Dec |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | <= 2.2 mg/L | all year |
| 001 | Nitrogen, ammonia total [as N] | 7 DA AVG | <= 5.6 mg/L | Apr, May, Jun, Jul, Aug, Sep, Oct |
| 001 | Nitrogen, ammonia total [as N] | 7 DA AVG | <= 6 mg/L | Jan, Feb, Mar, Nov, Dec |
| 001 | Nitrogen, ammonia total [as N] | 7 DA AVG | <= 3.3 mg/L | all year |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | <= 133.9 lb/d | Apr, May, Jun, Jul, Aug, Sep, Oct |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | <= 243.5 lb/d | Jan, Feb, Mar, Nov, Dec |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | <= 156 lb/d | all year |
| 001 | Nitrite + Nitrate total [as N] | MO AVG | report only | all year |
| 001 | Nitrite + Nitrate total [as N] | MO AVG | report only | all year |
| 001 | Nitrite + Nitrate total [as N] | 7 DA AVG | report only | all year |
| 001 | Nitrite + Nitrate total [as N] | 7 DA AVG | report only | all year |
| 001 | Nitrite + Nitrate total [as N] | MO AVG | report only | all year |
| 001 | Nitrite + Nitrate total [as N] | MO AVG | report only | all year |
| 001 | Phosphorus, total [as P] | MO AVG | report only | all year |
| 001 | Phosphorus, total [as P] | MO AVG | report only | all year |
| 001 | Phosphorus, total [as P] | 7 DA AVG | report only | all year |
| 001 | Phosphorus, total [as P] | 7 DA AVG | report only | all year |
| 001 | Phosphorus, total [as P] | MO AVG | report only | all year |
| 001 | Phosphorus, total [as P] | MO AVG | report only | all year |
| 001 | Zinc, total recoverable | MO AVG | <= 85.5 ug/L | all year |
| 001 | Zinc, total recoverable | MO AVG | <= 85.5 ug/L | all year |
| 001 | Zinc, total recoverable | 7 DA AVG | <= 171.6 ug/L | all year |
| 001 | Zinc, total recoverable | 7 DA AVG | <= 171.6 ug/L | all year |
| 001 | Zinc, total recoverable | MO AVG | <= 5.2 lb/d | all year |
| 001 | Zinc, total recoverable | MO AVG | <= 6.1 lb/d | all year |
| 001 | Copper, total recoverable | MO AVG | <= 9.2 ug/L | all year |
| 001 | Copper, total recoverable | MO AVG | <= 9.2 ug/L | all year |
| 001 | Copper, total recoverable | 7 DA AVG | <= 18.5 ug/L | all year |
| 001 | Copper, total recoverable | 7 DA AVG | <= 18.5 ug/L | all year |
| 001 | Copper, total recoverable | MO AVG | <= .45 lb/d | all year |
| 001 | Copper, total recoverable | MO AVG | <= .45 lb/d | all year |
| 001 | Pentachlorophenol | MO AVG | report only | all year |
| 001 | Pentachlorophenol | MO AVG | report only | all year |
| 001 | Pentachlorophenol | 7 DA AVG | report only | all year |
| 001 | Pentachlorophenol | 7 DA AVG | report only | all year |
| 001 | Pentachlorophenol | MO AVG | report only | all year |
| 001 | Pentachlorophenol | MO AVG | report only | all year |
| 001 | Flow, in conduit or thru treatment plant | MO AVG | report only | all year |
| 001 | Flow, in conduit or thru treatment plant | MO AVG | report only | all year |
| 001 | Flow, in conduit or thru treatment plant | DAILY MX | report only | all year |
| 001 | Flow, in conduit or thru treatment plant | DAILY MX | report only | all year |
| 001 | Chlorine, total residual | INST MAX | <= .011 mg/L | all year |
| 001 | Peracetic Acid | INST MAX | <= 1 mg/L | all year |
| 001 | Peracetic Acid | INST MAX | <= 1 mg/L | all year |
| 001 | Nitrogen, nitrate total [as NO3] | MO AVG | <= 10 mg/L | all year |
| 001 | Nitrogen, nitrate total [as NO3] | MO AVG | <= 10 mg/L | all year |
| 001 | Nitrogen, nitrate total [as NO3] | 7 DA AVG | <= 15 mg/L | all year |
| 001 | Nitrogen, nitrate total [as NO3] | 7 DA AVG | <= 15 mg/L | all year |
| 001 | Nitrogen, nitrate total [as NO3] | MO AVG | <= 542 lb/d | all year |
| 001 | Nitrogen, nitrate total [as NO3] | MO AVG | <= 542 lb/d | all year |
| 001 | Mercury, total recoverable | MO AVG | <= .0134 ug/L | all year |
| 001 | Mercury, total recoverable | MO AVG | <= .0134 ug/L | all year |
| 001 | Mercury, total recoverable | 7 DA AVG | <= .0269 ug/L | all year |
| 001 | Mercury, total recoverable | 7 DA AVG | <= .0269 ug/L | all year |
| 001 | Mercury, total recoverable | MO AVG | <= .00082 lb/d | all year |
| 001 | Mercury, total recoverable | MO AVG | <= .00095 lb/d | all year |
| 001 | Coliform, fecal general | 30DA GEO | <= 1000 #/100mL | all year |
| 001 | Coliform, fecal general | 30DA GEO | <= 1000 #/100mL | all year |
| 001 | Coliform, fecal general | 7 DA GEO | <= 2000 #/100mL | all year |
| 001 | Coliform, fecal general | 7 DA GEO | <= 2000 #/100mL | all year |
| 001 | Overflows | MO TOTAL | report only | all year |
| 001 | Overflows | MO TOTAL | report only | all year |
| 001 | Overflow volume [SS0 volume, CSO volume] | MO TOTAL | report only | all year |
| 001 | Overflow volume [SS0 volume, CSO volume] | MO TOTAL | report only | all year |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 10 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 10 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 9 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | BOD, carbonaceous [5 day, 20 C] | 7 DA AVG | <= 23 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | BOD, carbonaceous [5 day, 20 C] | 7 DA AVG | <= 15 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | BOD, carbonaceous [5 day, 20 C] | 7 DA AVG | <= 15 mg/L | May, Jun, Jul, Aug, Sep, Oct |
| 001 | BOD, carbonaceous [5 day, 20 C] | 7 DA AVG | <= 14 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 913.2 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 608.8 lb/d | May, Jun, Jul, Aug, Sep, Oct |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 708.9 lb/d | May, Jun, Jul, Aug, Sep, Oct |
| 001 | BOD, carbonaceous [5 day, 20 C] | MO AVG | <= 638 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| TX1 | Whole effluent toxicity - retest #1 | 7 DA MIN | report only | all year |
| TX1 | Whole effluent toxicity - retest #2 | 7 DA MIN | report only | all year |
| TX1 | Whole Effluent Toxicity - Retest #3 | 7 DA MIN | report only | all year |
| TX1 | Whole Effluent Toxicity [WET] - P. promelas | 7 DA MIN | >= 100 % | all year |
| TX1 | Whole Effluent Toxicity [WET] - P. promelas | 7 DA MIN | >= 80 % | all year |
| TX1 | Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7 DA MIN | report only | all year |
| TX1 | Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7 DA MIN | report only | all year |
| TX1 | Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7 DA MIN | report only | all year |
| TX1 | Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7 DA MIN | report only | all year |
| TX1 | NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7 DA MIN | report only | all year |
| TX1 | NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7 DA MIN | report only | all year |
| TX1 | NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7 DA MIN | report only | all year |
| TX1 | NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7 DA MIN | report only | all year |
| TX1 | Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7 DA MIN | report only | all year |
| TX1 | Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7 DA MIN | report only | all year |
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