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Clean Water Act discharge permit · NPDES IA0036986

UNDERWOOD CITY OF STP, Underwood, IA: NPDES IA0036986 discharge permit, effluent exceedances, inspections, penalties

UNDERWOOD CITY OF STP, held by City of Underwood, holds NPDES permit IA0036986. EPA’s file records it issued January 1, 2018 and expiring December 31, 2022. 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 filedUNDERWOOD CITY OF STP
Permittee as filedCity of Underwood
NPDES IDIA0036986
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJanuary 1, 2018
Expiration dateDecember 31, 2022
Issuing agencySTA
AddressUnderwood, IA 51576
Receiving water impaired303(D) Listed
SubwatershedHenchal Creek-Mosquito Creek (HUC 102300060405)
NAICS221320 – Sewage Treatment Facilities
SIC4952 – 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

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Flow, in conduit or thru treatment plant07969October 31, 2017630,170% over the limit
BOD, carbonaceous [5 day, 20 C]06238July 31, 2026181% over the limit
pH04232June 30, 2026
Solids, total suspended0222June 30, 202661% over the limit
Nitrogen, ammonia total [as N]011May 31, 20266% over the limit
E. coli011April 30, 2026284% over the limit

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0036986.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0036986.

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 IA0036986.

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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UNDERWOOD CITY OF STP, Underwood, Iowa: Individual permit IA0036986, held by City of Underwood; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued January 1, 2018, term to December 31, 2022, by STA; Sewage Treatment Facilities.

  • Flow, in conduit or thru treatment plant: 0 limits, 79 violations of any kind, 69 effluent exceedances, latest October 31, 2017, largest 630,170% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 0 limits, 62 violations of any kind, 38 effluent exceedances, latest July 31, 2026, largest 181% over the limit.
  • pH: 0 limits, 42 violations of any kind, 32 effluent exceedances, latest June 30, 2026.
  • Solids, total suspended: 0 limits, 22 violations of any kind, 2 effluent exceedances, latest June 30, 2026, largest 61% over the limit.
  • Nitrogen, ammonia total [as N]: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2026, largest 6% over the limit.
  • E. coli: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest April 30, 2026, largest 284% over the limit.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 299 were issued before IA0036986.

Coverages issued nearest IA0036986

UNDERWOOD CITY OF STP among its neighbors

4 discharge permits are in the Henchal Creek-Mosquito Creek subwatershed (HUC 102300060405); IA0036986 is one. Its county: 37, 2 major; IA0036986 is minor permit.

Other permits in the Henchal Creek-Mosquito Creek subwatershed (HUC 102300060405)

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers NPDES permit IA0036986 for UNDERWOOD CITY OF STP in Underwood, IA, held by City of Underwood, with a status of administratively continued and a discharger class of Minor. The facts list 6 pollutants under a numeric limit and 6 pollutants with an effluent exceedance.