Atwater Regional Wastewater Treatment Facility
Atwater, CA · Merced County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 6 MGD
- NPDES permit
- CAC422026
- Effective
- Permit expires
- July 2029
- Population served
- —
- CWNS 2022
Atwater Regional Wastewater Treatment Facility is a publicly owned wastewater treatment works in Atwater, Merced County, California. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit CAC422026 (effective), which expires in July 2029, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Atwater Regional Wastewater Treatment Facility.
No verified contacts on file yet
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Nearby wastewater treatment plants in California
Merced · 6 mi away
1.87 MGD
Turlock · 19 mi away
—
Mariposa · 39 mi away
0.16 MGD
Copperopolis · 44 mi away
0.39 MGD
Manteca · 50 mi away
5.18 MGD
Gilroy · 54 mi away
—
Tracy · 55 mi away
8.9 MGD
Stockton · 59 mi away
29.2 MGD
Atwater Regional 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 September 11, 2026; facility record last updated August 1, 2026.