Heyburn WWTP
1421 R St, Heyburn, ID 83336 · Minidoka County · Publicly Owned Treatment Works
- Average flow
- 0.71 MGD
- Design flow
- 0.66 MGD
- NPDES permit
- ID0020940
- Administratively continued
- Permit expires
- January 2007
- Population served
- 3,592
- CWNS 2022
Heyburn WWTP is a publicly owned wastewater treatment works in Heyburn, Minidoka County, Idaho treating an average of 0.71 million gallons per day against a permitted design capacity of 0.66 MGD, serving about 3,592 residents. It discharges under NPDES permit ID0020940 (administratively continued), which expires in January 2007, with 17 recorded violations in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in October 2021.
Treatment technology
2 treatment structures and unit processes identified at Heyburn WWTP.
Available with a free Klarifi account
See the full treatment train at Heyburn WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 17
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Heyburn WWTP in EPA's ICIS system.
- Formal actions
- 3
- 0 since FY2020
- Penalties assessed
- $13,000
- all cases
- Compliance actions
- $5.5M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Oct 2021
CITY OF HEYBURN, HEYBURN, IDAHO
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $5.5M
EPA's description of the case:
“EPA Region 10 enters into an Administrative Order on Consent with the City of Heyburn, Idaho for Clean Water Act and NPDES Permit Violations On August 6, 2018, EPA Region 10 entered into an…”
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Source: EPA ECHO, civil enforcement case 10-2018-0332.
Full case history with a free Klarifi account
Every action against Heyburn WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Heyburn WWTP.
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Nearby wastewater treatment plants in Idaho
Hansen · 28 mi away
0.07 MGD
Richfield · 39 mi away
—
Jerome · 41 mi away
3.59 MGD
Filer · 43 mi away
—
Shoshone · 43 mi away
0.13 MGD
Rockland · 45 mi away
—
American Falls · 48 mi away
0.53 MGD
Carey · 51 mi away
—
Heyburn WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 21, 2026; facility record last updated February 27, 2025.