Clean Water Act discharge permit · NPDES IA0023574
MOUNT AYR CITY OF STP, Mount Ayr, IA: NPDES IA0023574 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
MOUNT AYR CITY OF STP, held by CITY OF MOUNT AYR, holds NPDES permit IA0023574. EPA’s file records it issued May 1, 2024 and expiring April 30, 2029. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MOUNT AYR CITY OF STP |
|---|---|
| Permittee as filed | CITY OF MOUNT AYR |
| NPDES ID | IA0023574 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 1, 2024 |
| Expiration date | April 30, 2029 |
| Issuing agency | STA |
| Address | Mount Ayr, IA 50854 |
| Subwatershed | Headwaters Middle Fork Grand River (HUC 102801010301) |
| Other EPA IDs (FRS) | ICIS-AIR source IA0000001915900018 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 7Pollutants on file
- 6Under a numeric limit
- 7With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| pH | 2 | 83 | 77 | February 28, 2025 | |
| BOD, carbonaceous [5 day, 20 C] | 4 | 105 | 39 | August 31, 2020 | 483% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 21 | 21 | June 30, 2011 | 72% over the limit |
| Solids, total suspended | 4 | 84 | 20 | May 31, 2026 | 430% over the limit |
| Nitrogen, ammonia total [as N] | 48 | 18 | 14 | January 31, 2022 | 856% over the limit |
| Oxygen, dissolved [DO] | 1 | 17 | 13 | October 31, 2021 | 44% over the limit |
| E. coli | 1 | 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 IA0023574.
Inspections
EPA’s inspection file holds no inspection for NPDES IA0023574.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES IA0023574.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IA0023574.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 IA0023574 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.