Mississippi NPDES permit search
Status, expiry and violations for 130 municipal wastewater permits · issued by MDEQ
In short
How do I look up an NPDES permit in Mississippi?
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 MDEQ’s enSearch Online or enSearch’s list of recently issued permits. EPA’s ECHO database shows the monitoring results and violations of every permit. The 2,861 industrial permits in Mississippi are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
113
Administratively continued
13
Expired
4
Plants with effluent violations, 3 years
105
Where to find official Mississippi NPDES records
Mississippi Department of Environmental Quality (MDEQ) runs the NPDES program in Mississippi under authorization from EPA Region 4. It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. MDEQ website ↗
permits
Open “EPD Active Permits and Coverages”, set Permit Type to “Water - NPDES” and search by facility name, permit number or county.
permit documents
enSearch’s list of permits issued in about the last year, each linked to a copy of the permit.
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
- Permits follow EPA’s format, MS plus seven characters. MDEQ files them under an Agency Interest ID for each site, which can hold several permits.
- Discharge monitoring reports
- Through EPA’s NetDMR, the official way to file since December 2016.
- Violations and enforcement
- MDEQ’s Commission orders since 2011 ↗ and MDEQ’s compliance inspections ↗
Industrial and commercial NPDES permits in Mississippi
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 2,861 individual permits in force for industrial and commercial facilities in Mississippi (manufacturers, food processors, mines, power plants, landfills), 50 of them major dischargers, plus 367 facilities covered by a general permit, mostly for stormwater. 379 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 2,861 industrial permits in Mississippi
Search every industrial and commercial discharger in Mississippi by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Mississippi: 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 Mississippi wastewater plants
105 of the 130 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 114 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 24 formal cases naming Mississippi wastewater plants, 12 of them since fiscal year 2020, with $792,958 in penalties assessed. Enforcement cases in Mississippi →
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: 36 permits
2030: 24 permits
2031: 9 permits
Largest permit holders in Mississippi
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| West Rankin Utility Authority WWTF | Richland | 12.02 | 29.1 | MS0061743 | Effective | Feb 2030 | 4 |
| Meridian POTW | Meridian | 7.57 | 13 | MS0020117 | Effective | Oct 2030 | 39 |
| West Biloxi Wastewater Treatment Plant | Biloxi | 5.57 | 11.7 | MS0030333 | Effective | Jun 2028 | 1 |
| Harrison County Wastewater And Solid Waste Management Authority, East Biloxi Pot | Biloxi | 2.95 | 10 | MS0023159 | Effective | Mar 2029 | 0 |
| Reynolds R. Ridgely Wastewater Plant | Columbus | 3.85 | 10 | MS0056472 | Effective | Dec 2030 | 2 |
| Starkville Wastewater Treatment Facility | Starkville | 4.29 | 10 | MS0036145 | Effective | Aug 2030 | 129 |
| Canton Mun Util-Beatties Bluff WWTF | Canton | 4.91 | 8 | MS0057517 | Effective | Dec 2030 | 372 |
| Dcrua, Short Fork WWTF | Hernando | 6.26 | 8 | MS0062227 | Effective | Jun 2030 | 114 |
| Laurel Potw, Number 1 | Laurel | 3.18 | 7.4 | MS0024163 | Effective | Apr 2031 | 0 |
| City Of Greenwood - Wastewater Treatment Plant | Greenwood | 2.49 | 6.32 | MS0023833 | Effective | Dec 2029 | 0 |
Mississippi 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 · Centrate · Ozonation · all terms