Clean Water Act discharge permit · NPDES TX0023191
CITY OF SONORA WWTP, Sonora, TX: NPDES TX0023191 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 38Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
CITY OF SONORA WWTP, held by SONORA, CITY OF, holds NPDES permit TX0023191, which discharges to Dry Devils River; Rio Grande Basin. EPA’s file records it issued November 8, 2018 and expiring November 8, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CITY OF SONORA WWTP |
|---|---|
| Permittee as filed | SONORA, CITY OF |
| NPDES ID | TX0023191 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 8, 2018 |
| Expiration date | November 8, 2023 |
| Address | Sonora, TX 76950 |
| Receiving water | DRY DEVILS RIVER; RIO GRANDE BASIN |
| Subwatershed | Shurley Draw-Dry Devils River (HUC 130403010504) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 44Pollutants on file
- 38Under a numeric limit
- 43With a violation of any kind
- 8With 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] | 3 | 89 | 20 | March 31, 2013 | 680% over the limit |
| Chlorine, total residual | 2 | 64 | 14 | July 31, 2026 | 100% over the limit |
| Solids, total suspended | 3 | 79 | 10 | February 28, 2026 | 810% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 74 | 8 | December 31, 2017 | 296% over the limit |
| E. coli | 2 | 38 | 4 | July 31, 2025 | 506% over the limit |
| pH | 3 | 66 | 3 | December 31, 2013 | |
| Oxygen, dissolved [DO] | 1 | 26 | 3 | August 31, 2008 | 28% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 47 | 1 | January 31, 2017 | 148% over the limit |
| Arsenic, dry weight | 5 | 25 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 25 | 0 | ||
| Selenium, dry weight | 3 | 15 | 0 | ||
| Copper, dry weight | 3 | 15 | 0 | ||
| Cadmium, dry weight | 3 | 15 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 15 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 15 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 15 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 15 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 15 | 0 | ||
| Conductivity | 0 | 15 | 0 | ||
| Phosphorus, total [as P] | 0 | 15 | 0 | ||
| Potassium, total [as K] | 0 | 15 | 0 | ||
| pH, in soil | 0 | 15 | 0 | ||
| Nitrogen, total [as N] | 0 | 11 | 0 | ||
| Nickel, total [as Ni] | 2 | 10 | 0 | ||
| Level of pathogen requirements achieved | 2 | 10 | 0 | ||
| Description of pathogen option used | 2 | 10 | 0 | ||
| Vector attraction reduction alternative used | 2 | 10 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 6 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 6 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 6 | 0 | ||
| Annual amt of sludge incinerated | 1 | 6 | 0 | ||
| Annual sludge production, total | 1 | 6 | 0 | ||
| Annual amount of sludge land applied | 1 | 6 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 6 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 6 | 0 | ||
| Annual amt sludge transported interstate | 1 | 6 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 6 | 0 | ||
| Fecal coliform | 1 | 5 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 5 | 0 | ||
| Boundary areas | 1 | 5 | 0 | ||
| Salmonella | 1 | 5 | 0 | ||
| Pollutant table from 503.13 | 1 | 5 | 0 | ||
| Phosphate, ortho [as PO4] | 0 | 4 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 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 TX0023191.
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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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TX0023191 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.