Westchester Co Of - Yonkers Joint Waste Water Treatment Plant
1 Fernbrook St, Yonkers, NY 10705 · Westchester County · Publicly Owned Treatment Works
- Average flow
- 65.64 MGD
- Design flow
- 120 MGD
- NPDES permit
- NY0026689
- Administratively continued
- Permit expires
- May 2019
- Population served
- 495,659
- CWNS 2022
Westchester Co Of - Yonkers Joint Waste Water Treatment Plant is a publicly owned wastewater treatment works in Yonkers, Westchester County, New York treating an average of 65.64 million gallons per day against a permitted design capacity of 120 MGD, serving about 495,659 residents. It discharges under NPDES permit NY0026689 (administratively continued), which expires in May 2019, with 29 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in January 2021.
Treatment technology
One treatment structure or unit process identified at Westchester Co Of - Yonkers Joint Waste Water Treatment Plant.
Available with a free Klarifi account
See the full treatment train at Westchester Co Of - Yonkers Joint Waste Water Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 29
- 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 Westchester Co Of - Yonkers Joint Waste Water Treatment Plant in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Compliance actions
- $16,000
- required by EPA orders
- EPA inspections
- 2
- latest Nov 2022
Latest case · Jan 2021
Westchester County Department of Environmental Facilities - Yonkers Joint
Administrative order · CWA, NPDES Permit Violations · Unilateral Administrative Order Without Adjudication · Compliance actions $16,000
EPA's description of the case:
“On February 13, 2019, EPA conducted a Combined Sewer System (CSS) and Sanitary Sewer System (SSS) Compliance Evaluation Inspection (CEI) of the Respondent's Yonkers Joint collection system and…”
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Source: EPA ECHO, civil enforcement case 02-2019-3021.
Full case history with a free Klarifi account
Every action against Westchester Co Of - Yonkers Joint Waste Water Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Capital improvement projects in Yonkers
Yonkers's capital improvement plan lists 3 water, sewer and wastewater line items worth $23M starting 2026–2026. The largest budgeted items are shown here.
All water and sewer capital projects in Yonkers →
| Project | Budget | Years |
|---|---|---|
| Water Systems Improvements | $21,500,000 | 2026–2029 |
| Crisfield Pump Station | $1,100,000 | 2026–2026 |
| Water Tower Rehabilitation | $750,000 | 2026–2026 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
5 verified contacts for Westchester Co Of - Yonkers Joint Waste Water Treatment Plant, 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 Westchester Co Of - Yonkers Joint Waste Water Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in New York
New York · 7 mi away
107.6 MGD
New Rochelle · 7 mi away
11.16 MGD
Bronx · 8 mi away
123.8 MGD
Orangeburg · 8 mi away
6.33 MGD
Manhattan · 9 mi away
182.4 MGD
Queens · 9 mi away
57.8 MGD
Mamaroneck · 9 mi away
12.11 MGD
Astoria · 10 mi away
95.2 MGD
Westchester Co Of - Yonkers Joint Waste Water Treatment Plant: 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 January 23, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms