Clean Water Act discharge permit · NPDES AR0046566
WALNUT RIDGE, CITY OF - WALNUT RIDGE WWTP, Walnut Ridge, AR: NPDES AR0046566 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
WALNUT RIDGE, CITY OF - WALNUT RIDGE WWTP, held by WALNUT RIDGE, CITY OF-WWTP, holds NPDES permit AR0046566, which discharges to Village Cr,White R. EPA’s file records it issued May 31, 2016 and expiring June 30, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | WALNUT RIDGE, CITY OF - WALNUT RIDGE WWTP |
|---|---|
| Permittee as filed | WALNUT RIDGE, CITY OF-WWTP |
| NPDES ID | AR0046566 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 31, 2016 |
| Expiration date | June 30, 2021 |
| Address | Walnut Ridge, AR 72476 |
| Receiving water | VILLAGE CR,WHITE R |
| Subwatershed | Coon Creek-Village Creek (HUC 110100130101) |
| Program components on file | POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 28Pollutants on file
- 26Under a numeric limit
- 28With a violation of any kind
- 11With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 6 | 302 | 284 | July 31, 2026 | 510% over the limit |
| Solids, total suspended | 3 | 172 | 154 | July 31, 2026 | 238% over the limit |
| Coliform, fecal general | 4 | 158 | 146 | July 31, 2026 | 99,999% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 157 | 136 | July 31, 2026 | 607% over the limit |
| Mercury, total recoverable | 6 | 153 | 129 | July 31, 2026 | 60,548,328% over the limit |
| Chlorine, total residual | 1 | 95 | 90 | January 31, 2023 | 14,264% over the limit |
| Oxygen, dissolved [DO] | 2 | 63 | 43 | September 30, 2025 | 94% over the limit |
| Whole effluent toxicity | 4 | 37 | 12 | December 31, 2017 | 100% over the limit |
| pH | 2 | 24 | 12 | March 31, 2026 | |
| Peracetic Acid | 0 | 10 | 8 | June 30, 2026 | 205% over the limit |
| Whole Effluent Toxicity [WET] - P. promelas | 2 | 10 | 2 | March 31, 2025 | 44% over the limit |
| Nitrite + Nitrate total [as N] | 3 | 12 | 0 | ||
| Phosphorus, total [as P] | 3 | 12 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 12 | 0 | ||
| Whole Effluent Toxicity [WET] - C. dubia | 4 | 8 | 0 | ||
| Overflows | 1 | 8 | 0 | ||
| Overflow volume [SS0 volume, CSO volume] | 1 | 8 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 1 | 6 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 1 | 6 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 1 | 6 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 1 | 6 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 1 | 6 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 5 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 5 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 5 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 5 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 5 | 0 | ||
| Arsenic, total recoverable | 0 | 2 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES AR0046566.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.