MARIPOSA, CA · Mariposa County

PONDEROSA BASIN MUTUAL WTR CO Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.

System facts

System ID (PWSID): CA2210002
System type: Community Water System
Population served: 798
Service connections: 317
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
August 1, 2007 – August 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 2006 – June 30, 2006
Resolved
Monitoring, Regular
—
Radium-228
January 1, 2001 – December 31, 2007
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
August 1, 2007 – August 31, 2007	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 2006 – June 30, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2001 – December 31, 2007	Monitoring, Regular	Radium-228	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

July 17, 2025State Administrative/Compliance Order without penalty issued4 linked violations
October 31, 2007State Compliance achieved12 linked violations
March 28, 2007State Compliance achieved5 linked violations
December 30, 2004State Compliance achieved8 linked violations
November 30, 2004State Compliance achieved6 linked violations

Contact

DONATI, ALEARDO TUFFY

209-742-6572

MARIPOSA, CA 95338