Clean Water Act discharge permit · NPDES WY0020435
TOWN OF DAYTON WASTEWATER TREATMENT PLANT, Dayton, WY: NPDES WY0020435 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
TOWN OF DAYTON WASTEWATER TREATMENT PLANT, held by Dayton, Town of, holds NPDES permit WY0020435. EPA’s file records it issued October 2, 2023 and expiring December 31, 2028. 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 | TOWN OF DAYTON WASTEWATER TREATMENT PLANT |
|---|---|
| Permittee as filed | Dayton, Town of |
| NPDES ID | WY0020435 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 2, 2023 |
| Expiration date | December 31, 2028 |
| Issuing agency | Wyoming Department of Environmental Quality |
| Address | Dayton, WY 82836 |
| Subwatershed | Columbus Creek-Tongue River (HUC 100901010106) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 18Pollutants on file
- 10Under a numeric limit
- 18With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 7 | 97 | 40 | September 30, 2023 | 220% over the limit |
| BOD, 5-day, percent removal | 1 | 42 | 33 | September 30, 2023 | 567% over the limit |
| Flow, total | 0 | 14 | 14 | December 31, 2016 | 502% over the limit |
| Solids, total suspended | 7 | 42 | 12 | August 31, 2016 | 286% over the limit |
| E. coli | 6 | 33 | 9 | March 31, 2024 | 6,796% over the limit |
| Solids, suspended percent removal | 1 | 4 | 4 | June 30, 2025 | 143% over the limit |
| Flow | 4 | 38 | 2 | June 30, 2023 | 42,400% over the limit |
| pH | 4 | 25 | 1 | April 30, 2019 | |
| Chlorine, total residual | 5 | 12 | 0 | ||
| Produced water, oil and grease | 0 | 10 | 0 | ||
| Temperature, water deg. centigrade | 1 | 9 | 0 | ||
| Duration | 1 | 9 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 5 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 1 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 1 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 1 | 0 | ||
| Phosphorus, total [as P] | 0 | 1 | 0 | ||
| Solids, total dissolved | 0 | 1 | 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 WY0020435.
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 WY0020435 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.