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Emmett WWTP

1478 Cascade Rd, Emmett, ID 83617 · Gem County · Publicly Owned Treatment Works

Average flow
1.76 MGD
Design flow
5.7 MGD
NPDES permit
ID0020311
Administratively continued
Permit expires
January 2007
Population served
7,647
CWNS 2022

Emmett WWTP is a publicly owned wastewater treatment works in Emmett, Gem County, Idaho treating an average of 1.76 million gallons per day against a permitted design capacity of 5.7 MGD, serving about 7,647 residents. It discharges under NPDES permit ID0020311 (administratively continued), which expires in January 2007, with 2 recorded violations in the last three years. EPA has recorded 4 formal enforcement actions naming the plant, the latest in August 2017.

Treatment technology

One treatment structure or unit process identified at Emmett WWTP.

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Compliance snapshot (last 3 years)

Total violations
2
Effluent violations
2

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

EPA enforcement history

Federal civil enforcement cases, compliance inspections and informal actions recorded for Emmett WWTP in EPA's ICIS system.

Formal actions
4
0 since FY2020
Penalties assessed
$63,500
all cases
Compliance actions
$2.2M
required by EPA orders
EPA inspections
0
none on record

Latest case · Aug 2017

CITY OF EMMETT, IDAHO - WASTEWATER TREATMENT PLANT (WWTP)

Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $2.1M

EPA's description of the case:

On October 25, 2012, Region 10 issued a compliance order by consent to the City of Emmett, Idaho (City) for violations of the City�s NPDES permit (Permit Number ID-002031-1). The facility received a…

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Source: EPA ECHO, civil enforcement case 10-2013-0008.

Full case history with a free Klarifi account

Every action against Emmett WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.

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Key contacts

Decision-makers at Emmett WWTP.

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Nearby wastewater treatment plants in Idaho

Star WWTP

Star · 13 mi away

1.58 MGD

New Plymouth Sewage Lagoon

New Plymouth · 16 mi away

Horseshoe Bend WWTP

Horseshoe Bend · 17 mi away

0.07 MGD

West Boise WWTP

Garden City · 17 mi away

62 MGD

Notus WWTP

Notus · 17 mi away

Nampa WWTP

Nampa · 19 mi away

Greenleaf STP

Greenleaf · 19 mi away

Parma WWTP

Parma · 22 mi away

0.11 MGD

Emmett 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 14, 2026; facility record last updated March 9, 2025.


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