Iowa NPDES permit search
Status, expiry and violations for 747 municipal wastewater permits · issued by Iowa DNR
In short
How do I look up an NPDES permit in Iowa?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search Iowa DNR’s WWPIE or DNR’s list of current permits. EPA’s ECHO database shows the monitoring results and violations of every permit. The 1,558 industrial permits in Iowa are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
568
Administratively continued
177
Expired
2
Plants with effluent violations, 3 years
552
Where to find official Iowa NPDES records
Iowa Department of Natural Resources (Iowa DNR) runs the NPDES program in Iowa under authorization from EPA Region 7. It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. Iowa DNR website ↗
permits · permit documents
The Wastewater Permit Information Exchange. Select permit status FINAL plus at least one other field, such as part of the facility name or the county, and open the permit for its PDF and rationale.
permits
A downloadable list of current permits with permit numbers and discharge locations, to look up in WWPIE.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Permit numbers
- Iowa DNR identifies permits by its own seven-digit number (5715001 for Cedar Rapids) and keeps EPA’s IA number as a separate field.
- Discharge monitoring reports
- As permit-specific Excel forms emailed to the DNR field office, not through NetDMR.
- Violations and enforcement
- Iowa DNR’s enforcement orders ↗
Industrial and commercial NPDES permits in Iowa
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 1,558 individual permits in force for industrial and commercial facilities in Iowa (manufacturers, food processors, mines, power plants, landfills), 147 of them major dischargers, plus 1 facilities covered by a general permit, mostly for stormwater. 361 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 1,558 industrial permits in Iowa
Search every industrial and commercial discharger in Iowa by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Iowa: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Iowa wastewater plants
552 of the 747 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 589 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 44 formal cases naming Iowa wastewater plants, 7 of them since fiscal year 2020, with $114,158 in penalties assessed. Enforcement cases in Iowa →
Permit renewals by year
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
2029: 110 permits
2030: 133 permits
2031: 85 permits
Largest permit holders in Iowa
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Water Pollution Control Facility | Cedar Rapids | 39.59 | 86.95 | IA0042641 | Effective | Aug 2030 | 15 |
| Iowa City, City Of (south) STP | Iowa City | 8.98 | 43.3 | IA0070866 | Effective | Jul 2030 | 11 |
| Davenport Wastewater Treatment Plant | Davenport | 25.36 | 40 | IA0043052 | Administratively continued | Jun 2026 | 0 |
| City Of Sioux City STP | Sioux City | 14.01 | 28.73 | IA0043095 | Effective | Jan 2031 | 10 |
| Burlington, City Of (wwtp) | Burlington | 5.79 | 28.3 | IA0043079 | Effective | Jan 2027 | 4 |
| Coralville WWTP | Coralville | 2.98 | 22.56 | IA0020788 | Effective | Sep 2031 | 1 |
| Cedar Falls City Of STP | Cedar Falls | 4.83 | 21.6 | IA0036633 | Effective | Dec 2029 | 0 |
| Fort Dodge City Of STP | Fort Dodge | 11.42 | 21.6 | IA0044849 | Effective | Dec 2030 | 0 |
| Council Bluffs City Of STP | Council Bluffs | 8.21 | 17.9 | IA0036641 | Effective | Aug 2031 | 0 |
| Marshalltown City Of STP | Marshalltown | — | 17.44 | IA0038610 | Effective | Oct 2027 | 7 |
Iowa NPDES permits: questions
NPDES permit search in other states
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 October 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · Biosolids · Filter press · all terms