Missouri NPDES permit search
Status, expiry and violations for 671 municipal wastewater permits · issued by MoDNR as MSOP permits
In short
How do I look up an NPDES permit in Missouri?
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 DNR’s list of site-specific permits or MoCWIS. EPA’s ECHO database shows the monitoring results and violations of every permit. The 4,323 industrial permits in Missouri are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
307
Administratively continued
333
Expired
29
Plants with effluent violations, 3 years
496
Where to find official Missouri NPDES records
Missouri Department of Natural Resources (MoDNR) runs the NPDES program in Missouri under authorization from EPA Region 7, as the Missouri State Operating Permit (MSOP). It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. MoDNR website ↗
permit documents
DNR’s list of the permits in effect. Search by permit number (for example MO0089010), facility or county and click the permit number for the PDF.
permits
The Missouri Clean Water Information System: search by permit ID, facility or owner name, city or county.
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
- Site-specific permits are MO plus seven digits (MO0089010); DNR marks general permits with the prefixes MO-R and MO-G.
- Discharge monitoring reports
- Through DNR’s own eDMR in the MoGEM portal.
- Violations and enforcement
- DNR’s formal enforcement actions in effect ↗
Industrial and commercial NPDES permits in Missouri
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 4,323 individual permits in force for industrial and commercial facilities in Missouri (manufacturers, food processors, mines, power plants, landfills), 137 of them major dischargers, plus 9,589 facilities covered by a general permit, mostly for stormwater. 760 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 4,323 industrial permits in Missouri
Search every industrial and commercial discharger in Missouri by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Missouri: 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 Missouri wastewater plants
496 of the 671 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 535 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 102 formal cases naming Missouri wastewater plants, 16 of them since fiscal year 2020, with $2.6 million in penalties assessed. Enforcement cases in Missouri →
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: 56 permits
2030: 52 permits
2031: 38 permits
Largest permit holders in Missouri
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Metropolitan St. Louis Sewer District Bissell Point WWTP | St. Louis | 123.06 | — | MO0025178 | Effective | Aug 2031 | 14 |
| Metropolitan St. Louis Sewer District Lemay WWTP | St. Louis | 105.45 | — | MO0025151 | Effective | Aug 2031 | 6 |
| Little Blue Valley Sewer District | Independence | 39.13 | — | MOL101087 | Effective | Dec 2030 | 14 |
| Southwest WWTP | Springfield | 30.9 | — | MO0049522 | Administratively continued | Jul 2025 | 0 |
| MSD Coldwater WWTP | Florissant | 22.75 | — | MO0025160 | Effective | Aug 2031 | 1 |
| St. Joseph Water Protection Facility | Saint Joseph | 20.69 | — | MO0023043 | Administratively continued | Nov 2025 | 4 |
| Kc, Westside WWTP | Kansas City | 14.89 | — | MO0024929 | Administratively continued | Jun 2026 | 2 |
| Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant | Valley Park | 12.6 | — | MO0101362 | Effective | Aug 2031 | 0 |
| MSD Lower Meramec WWTP | St. Louis | 9.68 | — | MO0127949 | Effective | Aug 2031 | 0 |
| Joplin Turkey Creek WWTP | Joplin | 9.49 | — | MO0103349 | Administratively continued | Sep 2022 | 65 |
Missouri 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 · Filter press · FOG · all terms