Neillsville Wastewater Treatment Facility
805 W 10th St., Neillsville, Wi, Neillsville, WI 54456 · Clark County · Publicly Owned Treatment Works
- Average flow
- 0.29 MGD
- Design flow
- 0.52 MGD
- NPDES permit
- WI0021202
- Expired
- Permit expires
- June 2023
- Population served
- 2,746
- CWNS 2022
Neillsville Wastewater Treatment Facility is a publicly owned wastewater treatment works in Neillsville, Clark County, Wisconsin treating an average of 0.29 million gallons per day against a permitted design capacity of 0.52 MGD, serving about 2,746 residents. It discharges under NPDES permit WI0021202 (expired), which expires in June 2023, with 1 recorded violation in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Neillsville Wastewater Treatment Facility.
Available with a free Klarifi account
See the full treatment train at Neillsville Wastewater Treatment Facility: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Neillsville Wastewater Treatment Facility, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Neillsville Wastewater Treatment Facility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Granton · 7 mi away
—
Merrillan, · 13 mi away
0.29 MGD
Merrillan · 14 mi away
0.07 MGD
Black River Falls · 18 mi away
0.14 MGD
Spencer · 20 mi away
0.23 MGD
Black River Falls · 23 mi away
0.41 MGD
Marshfield · 24 mi away
2.9 MGD
Unity · 25 mi away
0.05 MGD
Neillsville Wastewater Treatment Facility: 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 September 16, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms