Mariposa Pud WWTF
4956 Miller Rd, Mariposa, CA 95338 · Mariposa County · Publicly Owned Treatment Works
- Average flow
- 0.18 MGD
- Design flow
- 0.61 MGD
- NPDES permit
- CAC441902
- Effective
- Permit expires
- April 2030
- Population served
- 1,800
- CWNS 2022
Mariposa Pud WWTF is a publicly owned wastewater treatment works in Mariposa, Mariposa County, California treating an average of 0.18 million gallons per day against a permitted design capacity of 0.61 MGD, serving about 1,800 residents. It discharges under NPDES permit CAC441902 (effective), which expires in April 2030, with 5 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Mariposa Pud WWTF.
Available with a free Klarifi account
See the full treatment train at Mariposa Pud WWTF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 5
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mariposa Pud WWTF.
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Clovis · 51 mi away
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San Andreas · 64 mi away
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Bear Valley · 68 mi away
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Mariposa Pud WWTF: 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 November 26, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms