Ionia WWTP
720 Wells Street, Ionia, MI 48846 · Ionia County · Publicly Owned Treatment Works
- Average flow
- 1.9 MGD
- Design flow
- —
- NPDES permit
- MI0021041
- Effective
- Permit expires
- October 2030
- Population served
- 17,316
- CWNS 2022
Ionia WWTP is a publicly owned wastewater treatment works in Ionia, Ionia County, Michigan treating an average of 1.9 million gallons per day, serving about 17,316 residents. It discharges under NPDES permit MI0021041 (effective), which expires in October 2030, with 20 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified at Ionia WWTP.
Available with a free Klarifi account
See the full treatment train at Ionia WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 20
- Effluent violations
- 2
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 Ionia WWTP, from the plant's pretreatment programme records.
- Industrial users
- 3
- 1 categorical
- Sampled for PFAS
- 1
- 2023–2024
- Above 12 ng/L PFOS
- 0
- highest 7.6 ng/L
On record: Ventra Ionia Main, Llc (Ionia), 7.6 ng/L; Michigan Reformatory (DOC) (Ionia); Ventra Greenwich Holdings Corp (Ionia). Most users are in automotive, metal and equipment manufacturing and hospitals and public institutions.
Industrial users of Ionia WWTP →PFAS sources at all Michigan plants →
Unlock the details behind these industrial users
Discharge flow, federal category, full PFAS sampling history, source documents and contacts for every industrial user of Ionia WWTP. Free with a Klarifi account.
Key contacts
5 verified contacts for Ionia WWTP, with validated emails and direct phone numbers.
Unlock 5 verified contacts (2 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Ionia WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Muir · 7 mi away
—
Saranac · 8 mi away
0.97 MGD
Orleans · 9 mi away
0.8 MGD
Saranac · 10 mi away
—
Belding · 11 mi away
0.98 MGD
Lake Odessa · 13 mi away
0.58 MGD
Lowell · 14 mi away
1.24 MGD
Sunfield · 16 mi away
—
Ionia 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 6, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms