Delaware NPDES permit search
Status, expiry and violations for 8 municipal wastewater permits · issued by DNREC
In short
How do I look up an NPDES permit in Delaware?
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 the Delaware Environmental Navigator. EPA’s ECHO database shows the monitoring results and violations of every permit. The 17 industrial permits in Delaware are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
5
Administratively continued
1
Expired
2
Plants with effluent violations, 3 years
7
Where to find official Delaware NPDES records
Delaware Department of Natural Resources and Environmental Control (DNREC) runs the NPDES program in Delaware under authorization from EPA Region 3. It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. Federal facilities and the pretreatment program stay with EPA. DNREC website ↗
permits · inspections · violations · enforcement
In Search Permits, enter the permit number or set Program to “Wastewater(NPDES)” and search; results download as PDF or CSV. Search Facilities finds a plant by name or town.
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
- Each permit carries an NPDES number and a state permit number, for example DE0021555 and WPCC 3077F/74 for the Delaware City plant.
- Discharge monitoring reports
- Through DNREC’s own DMR Online system.
- Violations and enforcement
- DNREC’s environmental violations search ↗
Industrial and commercial NPDES permits in Delaware
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 17 individual permits in force for industrial and commercial facilities in Delaware (manufacturers, food processors, mines, power plants, landfills), 1 of them major dischargers, plus 1 facilities covered by a general permit, mostly for stormwater. 1 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 17 industrial permits in Delaware
Search every industrial and commercial discharger in Delaware by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Delaware: 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 Delaware wastewater plants
7 of the 8 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 7 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count.
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.
2026: 1 permits
2028: 2 permits
2030: 2 permits
Largest permit holders in Delaware
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| South Coastal STP | Frankford | 4.37 | — | DEL050008 | Effective | Dec 2030 | 5 |
| Seaford Wastewater Treatment Plant | Seaford | 1.61 | — | DE0020265 | Administratively continued | Oct 2020 | 0 |
| Howard Seymour Water Reclamation Plant | Lewes | 1.29 | — | DE0021512 | Expired | Oct 2023 | 1 |
| Selbyville Wastewater Treatment Facility | Selbyville | 1.24 | — | DE0020010 | Effective | Apr 2028 | 1 |
| Laurel Water Department | Laurel | 0.5 | — | DE0020125 | Effective | Oct 2028 | 62 |
| Delaware City Wastewater Treatment Plant | Delaware City | 0.42 | — | DEL021555 | Effective | Dec 2030 | 2 |
| Milton Wastewater Treatment Plant | Milton | 0.23 | — | DE0021491 | Expired | Apr 2016 | 11 |
| Port Penn Wastewater Treatment Plant | Port Penn | 0.04 | — | DE0021539 | Effective | Oct 2026 | 1 |
Delaware 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