Crow Agency Lagoon
Section 36, Township 2 South, Range 34 East, Crow Agency, MT 59022 · Big Horn County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- MTG589009
- Effective
- Permit expires
- March 2027
- Population served
- —
- CWNS 2022
Crow Agency Lagoon is a publicly owned wastewater treatment works in Crow Agency, Big Horn County, Montana. It discharges under NPDES permit MTG589009 (effective), which expires in March 2027, with 817 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in October 2018.
Treatment technology
One treatment structure or unit process identified at Crow Agency Lagoon.
Available with a free Klarifi account
See the full treatment train at Crow Agency Lagoon: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 817
- Effluent violations
- 24
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 Crow Agency Lagoon in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- EPA inspections
- 0
- none on record
Latest case · Oct 2018
Crow Agency Wastewater Lagoon
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty
EPA's description of the case:
“On October 29, 2018, the EPA issued an Administrative Order for Compliance (CWA-08-2019-0001) pursuant to alleged CWA and NPDES violations at the Crow Agency Wastewater Lagoon.”
Source: EPA ECHO, civil enforcement case 08-2019-0036.
Full case history with a free Klarifi account
Every action against Crow Agency Lagoon with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
1 verified contact for Crow Agency Lagoon, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Crow Agency Lagoon, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Montana
Lodge Grass · 20 mi away
0.0089 MGD
Lame Deer · 38 mi away
0.48 MGD
Billings · 51 mi away
20.32 MGD
Forsyth · 59 mi away
0.23 MGD
Laurel · 63 mi away
0.29 MGD
Park City · 70 mi away
0.08 MGD
Fromberg · 72 mi away
0.04 MGD
Joliet · 73 mi away
0.05 MGD
Crow Agency Lagoon: 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 October 26, 2026; facility record last updated February 9, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms