Is RANCHO SANTA TERESA MW CO. required to publish a Consumer Confidence Report?

Yes. RANCHO SANTA TERESA MW CO. 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 RANCHO SANTA TERESA MW CO.’s next Consumer Confidence Report due?

RANCHO SANTA TERESA MW CO.’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.

RAMONA, CA · San Diego County

RANCHO SANTA TERESA MW CO. Water System

Consumer Confidence Report status

RANCHO SANTA TERESA MW CO. 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 RANCHO SANTA TERESA MW CO..

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): CA3700918
System type: Community Water System
Population served: 102
Service connections: 38
Ownership: privately owned
Water source: groundwater (wells)

RANCHO SANTA TERESA MW CO. is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 102 people from groundwater.

As of August 1, 2026, its federal record holds 40 entries between 1980 and 2023, all of which EPA lists as closed. Nothing has been added since 2023.

Of the 40, 15 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, the Radionuclides and Revised Rad Rule, and the Miscellaneous Other Rules.

Violation history

Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 2023 – December 31, 2023
Archived
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
June 1, 2022 – June 30, 2022
Archived
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
April 1, 2022 – April 30, 2022
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
October 1, 2021 – December 31, 2021
Resolved
Monitoring, Regular
—
Nitrate
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
January 1, 2021 – March 31, 2021
Resolved
Monitoring, Regular
—
Nitrate
April 1, 2019 – June 30, 2019
Resolved
Monitoring, Regular
—
Nitrate
July 1, 2017 – September 30, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
January 1, 2017 – March 31, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
October 1, 2016 – December 31, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
July 1, 2016 – September 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
April 1, 2016 – June 30, 2016
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2016 – December 31, 2021
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
January 1, 2016 – March 31, 2016
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2016 – December 31, 2021
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2016 – December 31, 2021
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2016 – December 31, 2021
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2016 – December 31, 2021
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
October 1, 2015 – December 31, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
April 1, 2015 – June 30, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
April 1, 2014 – June 30, 2014
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2008 – November 30, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2008 – July 31, 2008
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
June 1, 2008 – June 30, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2007 – October 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
January 1, 2007 – January 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2006 – September 30, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2005 – July 31, 2005
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
March 1, 2005 – March 31, 2005
Resolved
Notification, Public
—
No contaminant on record
May 1, 1984 – May 31, 1984
Archived
Notification, Public
—
No contaminant on record
April 1, 1984 – April 30, 1984
Archived
Notification, Public
—
No contaminant on record
February 1, 1984 – February 29, 1984
Archived
Notification, Public
—
No contaminant on record
January 1, 1984 – January 31, 1984
Archived
Notification, Public
—
No contaminant on record
October 1, 1983 – October 31, 1983
Archived
Notification, Public
—
No contaminant on record
September 1, 1983 – September 30, 1983
Archived
Notification, Public
—
No contaminant on record
August 1, 1983 – August 31, 1983
Archived
Notification, Public
—
No contaminant on record
December 1, 1982 – December 31, 1982
Archived
Notification, Public
—
No contaminant on record
October 1, 1982 – October 31, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
October 1, 2023 – December 31, 2023	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
June 1, 2022 – June 30, 2022	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Archived
April 1, 2022 – April 30, 2022	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2021 – December 31, 2021	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2021 – March 31, 2021	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2019 – June 30, 2019	Monitoring, Regular	Nitrate	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2017 – March 31, 2017	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
October 1, 2016 – December 31, 2016	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
July 1, 2016 – September 30, 2016	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
April 1, 2016 – June 30, 2016	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
January 1, 2016 – December 31, 2021	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2016 – March 31, 2016	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
January 1, 2016 – December 31, 2021	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2016 – December 31, 2021	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2016 – December 31, 2021	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2016 – December 31, 2021	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
October 1, 2015 – December 31, 2015	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
April 1, 2015 – June 30, 2015	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
April 1, 2014 – June 30, 2014	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
November 1, 2008 – November 30, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2008 – July 31, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 2008 – June 30, 2008	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2007 – October 31, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2007 – January 31, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 2006 – September 30, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2005 – July 31, 2005	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
March 1, 2005 – March 31, 2005	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
May 1, 1984 – May 31, 1984	Notification, Public	—	—	Archived
April 1, 1984 – April 30, 1984	Notification, Public	—	—	Archived
February 1, 1984 – February 29, 1984	Notification, Public	—	—	Archived
January 1, 1984 – January 31, 1984	Notification, Public	—	—	Archived
October 1, 1983 – October 31, 1983	Notification, Public	—	—	Archived
September 1, 1983 – September 30, 1983	Notification, Public	—	—	Archived
August 1, 1983 – August 31, 1983	Notification, Public	—	—	Archived
December 1, 1982 – December 31, 1982	Notification, Public	—	—	Archived
October 1, 1982 – October 31, 1982	Notification, Public	—	—	Archived
October 1, 1981 – September 30, 1982	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
October 30, 1980 – October 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

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

Enforcement actions

December 21, 2022State Compliance achieved14 linked violations
December 13, 2022State Administrative/Compliance Order with penalty issued66 linked violations
November 1, 2022State Compliance achieved25 linked violations
March 27, 2020State Compliance achieved31 linked violations
December 26, 2018State Administrative/Compliance Order with penalty issued60 linked violations
June 30, 2017State Administrative/Compliance Order without penalty issued15 linked violations
April 9, 2015State Administrative/Compliance Order without penalty issued3 linked violations
February 5, 2015State Administrative/Compliance Order without penalty issued1 linked violation
January 1, 2015State Administrative/Compliance Order without penalty issued28 linked violations
November 14, 2014State Administrative/Compliance Order without penalty issued1 linked violation
September 30, 2014State Administrative/Compliance Order without penalty issuedgeneral compliance action — not tied to a specific violation on record
August 12, 2014State Administrative/Compliance Order without penalty issued1 linked violation
June 30, 2014State Administrative/Compliance Order without penalty issuedgeneral compliance action — not tied to a specific violation on record
March 11, 2009State Administrative/Compliance Order without penalty issued1 linked violation
July 30, 2008State Compliance achieved30 linked violations
July 23, 2008State Administrative/Compliance Order without penalty issued1 linked violation
July 15, 2008State Administrative/Compliance Order without penalty issued1 linked violation
April 10, 2005State Administrative/Compliance Order without penalty issued1 linked violation

Common questions

Is RANCHO SANTA TERESA MW CO. required to publish a Consumer Confidence Report?: Yes. RANCHO SANTA TERESA MW CO. 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 RANCHO SANTA TERESA MW CO.’s next Consumer Confidence Report due?: RANCHO SANTA TERESA MW CO.’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does RANCHO SANTA TERESA MW CO. have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for RANCHO SANTA TERESA MW CO..
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

MATTERN, RALPH

858-354-5073

RAMONA, CA 92065