Hawaii NPDES permit search
Status, expiry and violations for 3 municipal wastewater permits · issued by DOH
In short
How do I look up an NPDES permit in Hawaii?
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 DOH’s Water Pollution Control Viewer or the Clean Water Branch’s folder of final permits. EPA’s ECHO database shows the monitoring results and violations of every permit. The 118 industrial permits in Hawaii are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
2
Administratively continued
1
Expired
0
Plants with effluent violations, 3 years
3
Where to find official Hawaii NPDES records
Hawaii Department of Health (DOH) runs the NPDES program in Hawaii under authorization from EPA Region 9. It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. DOH website ↗
permits · inspections · enforcement
Type the facility name, owner or permit number and filter to Individual Permit; Export downloads the permit, inspection and enforcement data. The documents themselves need a government records request.
permit documents
Open the “Final Individual Permits and Documents” folder and pick the PDF named after the facility or permit number. Permits issued before late 2018 are in the viewer instead.
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; Clean Water Branch notices write them with a space (HI 0021504).
- Discharge monitoring reports
- Through the Clean Water Branch’s e-Permitting compliance form or EPA’s NetDMR.
- Violations and enforcement
- the Clean Water Branch’s notices of violation and order ↗
Industrial and commercial NPDES permits in Hawaii
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 118 individual permits in force for industrial and commercial facilities in Hawaii (manufacturers, food processors, mines, power plants, landfills), 28 of them major dischargers, plus 182 facilities covered by a general permit, mostly for stormwater. 17 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 118 industrial permits in Hawaii
Search every industrial and commercial discharger in Hawaii by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Hawaii: 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 Hawaii wastewater plants
3 of the 3 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 3 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.
2030: 1 permits
2031: 1 permits
Largest permit holders in Hawaii
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Hawaii County Hilo WWTP | Hilo | 3.85 | 5 | HI0021377 | Effective | Apr 2030 | 52 |
| Wailua Wastewater Treatment Plant | Kapaa | 0.48 | 1.5 | HI0020257 | Administratively continued | Oct 2024 | 4 |
| County Of Hawaii Papaikou-Paukaa WWTP | Hilo | 0.1 | 0.35 | HI0021113 | Effective | Apr 2031 | 40 |
Hawaii 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