Nampa WWTP
Nampa, ID · Canyon County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 11.76 MGD
- NPDES permit
- ID0022063
- Administratively continued
- Permit expires
- October 2021
- Population served
- 100,200
- CWNS 2022
Nampa WWTP is a publicly owned wastewater treatment works in Nampa, Canyon County, Idaho, serving about 100,200 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit ID0022063 (administratively continued), which expires in October 2021, with 27 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 27
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
7 verified contacts for Nampa WWTP, with validated emails and direct phone numbers.
Unlock 7 verified contacts (4 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Nampa WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Idaho
Star · 8 mi away
1.58 MGD
Meridian · 8 mi away
1.23 MGD
Marsing · 12 mi away
—
Greenleaf · 13 mi away
—
Garden City · 13 mi away
62 MGD
Notus · 15 mi away
—
Wilder · 17 mi away
0.08 MGD
Homedale · 19 mi away
0.5 MGD
Nampa WWTP: frequently asked questions
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 September 11, 2026; facility record last updated March 4, 2025.