Shell Rock WWTP
24130 Woods Ave, Shell Rock, IA 50670 · Butler County · Publicly Owned Treatment Works
- Average flow
- 0.16 MGD
- Design flow
- 0.62 MGD
- NPDES permit
- IA0033359
- Effective
- Permit expires
- January 2027
- Population served
- 1,268
- CWNS 2022
Shell Rock WWTP is a publicly owned wastewater treatment works in Shell Rock, Butler County, Iowa treating an average of 0.16 million gallons per day against a permitted design capacity of 0.62 MGD, serving about 1,268 residents. It discharges under NPDES permit IA0033359 (effective), which expires in January 2027, with 48 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Shell Rock WWTP.
Available with a free Klarifi account
See the full treatment train at Shell Rock WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 48
- Effluent violations
- 48
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Industrial users and pretreatment
Industries that discharge process wastewater to Shell Rock WWTP, from the plant's pretreatment programme records.
- Industrial users
- 1
- on record
On record: Trinityrail Maintenance Services INC 4036 (Shell Rock). Most users are in other industries.
Unlock the details behind these industrial users
Discharge flow, federal category, source documents and contacts for every industrial user of Shell Rock WWTP. Free with a Klarifi account.
Key contacts
Decision-makers at Shell Rock WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Iowa
Waverly · 6 mi away
1.42 MGD
Janesville · 7 mi away
0.06 MGD
Plainfield · 11 mi away
—
Allison · 11 mi away
0.31 MGD
Denver · 12 mi away
0.28 MGD
Parkersburg · 13 mi away
0.21 MGD
Cedar Falls · 13 mi away
4.83 MGD
Dike · 13 mi away
—
Shell Rock 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 October 26, 2026; facility record last updated March 28, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms