Is WILLIAMS MUTUAL WATER COMPANY required to publish a Consumer Confidence Report?

Yes. WILLIAMS MUTUAL WATER COMPANY is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is WILLIAMS MUTUAL WATER COMPANY’s next Consumer Confidence Report due?

WILLIAMS MUTUAL WATER COMPANY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

PORTERVILLE, CA · Tulare County

WILLIAMS MUTUAL WATER COMPANY Water System

Consumer Confidence Report status

WILLIAMS MUTUAL WATER COMPANY must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for WILLIAMS MUTUAL WATER COMPANY.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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): CA5400718
System type: Community Water System
Population served: 165
Service connections: 50
Ownership: privately owned
Water source: groundwater (wells)

WILLIAMS MUTUAL WATER COMPANY is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 165 people from groundwater.

As of August 1, 2026, its federal record holds 2 entries between 1981 and 2018, all of which EPA lists as closed. Nothing has been added since 2018.

All 2 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules and the Radionuclides and Revised Rad Rule.

Violation history

Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
May 1, 2018 – May 31, 2018
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
May 1, 2018 – May 31, 2018	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 1981 – September 30, 1982	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

June 22, 2018State Administrative/Compliance Order without penalty issued1 linked violation
February 17, 2017State Compliance achieved1 linked violation
July 1, 2012State Compliance achieved1 linked violation
July 10, 2011State Violation/Reminder Notice1 linked violation
November 4, 2010State Compliance achievedgeneral compliance action — not tied to a specific violation on record
July 10, 2010State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
June 10, 2010State Compliance achieved1 linked violation
May 10, 2010State Violation/Reminder Notice1 linked violation
January 28, 2009State Compliance achieved4 linked violations
July 1, 2008State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
July 10, 2007State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 10, 2007State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
July 10, 2006State Formal Notice of Violation issued4 linked violations
July 10, 2006State Formal Notice of Violation issued1 linked violation

Common questions

Is WILLIAMS MUTUAL WATER COMPANY required to publish a Consumer Confidence Report?: Yes. WILLIAMS MUTUAL WATER COMPANY is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is WILLIAMS MUTUAL WATER COMPANY’s next Consumer Confidence Report due?: WILLIAMS MUTUAL WATER COMPANY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does WILLIAMS MUTUAL WATER COMPANY have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for WILLIAMS MUTUAL WATER COMPANY.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

MARTIN, EDDIE

559-788-9517

PORTERVILLE, CA 93258