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Botanical And Zoological Gardens, Little Rock, Arkansas. NPDES permit AR0037745 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 5 times (last April 2026), 6 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| December 2025 | 002 | Chlorine, total residual, instantaneous maximum | .36 mg/L | ≤ .011 mg/L | 3173% |
| December 2025 | 004 | Chlorine, total residual, instantaneous maximum | .05 mg/L | ≤ .011 mg/L | 355% |
| March 2026 | 002 | Chlorine, total residual, instantaneous maximum | .03 mg/L | ≤ .011 mg/L | 173% |
| March 2026 | 004 | Chlorine, total residual, instantaneous maximum | .05 mg/L | ≤ .011 mg/L | 355% |
| April 2026 | 002 | Oxygen, dissolved [DO], instantaneous minimum | 5.69 mg/L | ≥ 6 mg/L | 5% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 2 mg/L | May–Oct | 002 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Oxygen demand, chem. [low level] [COD] | monthly average | ≤ 50 mg/L | all year | 002 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | ≤ 75 mg/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 50 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 75 mg/L | all year | 002 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .011 mg/L | all year | 002 |
| Peracetic Acid | instantaneous maximum | ≤ 1 mg/L | all year | 002 |
| Coliform, fecal general | 30-day geometric mean | ≤ 1000 #/100mL | all year | 002 |
| Coliform, fecal general | 7-day geometric mean | ≤ 2000 #/100mL | all year | 002 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 2 mg/L | May–Oct | 004 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Oxygen demand, chem. [low level] [COD] | monthly average | ≤ 50 mg/L | all year | 004 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | ≤ 75 mg/L | all year | 004 |
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 50 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 75 mg/L | all year | 004 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chlorine, total residual | instantaneous maximum | ≤ .011 mg/L | all year | 004 |
| Peracetic Acid | instantaneous maximum | ≤ 1 mg/L | all year | 004 |
| Coliform, fecal general | 30-day geometric mean | ≤ 1000 #/100mL | all year | 004 |
| Coliform, fecal general | 7-day geometric mean | ≤ 2000 #/100mL | all year | 004 |
Cited limits by parameter: Arkansas's rules and the federal ones.
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