BRENTWOOD, CA · Contra Costa County
COLONIA SANTA MARIA Water System
Consumer Confidence Report status
COLONIA SANTA MARIA 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 COLONIA SANTA MARIA.
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)
- CA0707517
- System type
- Community Water System
- Population served
- 32
- Service connections
- 10
- Ownership
- privately owned
- Water source
- groundwater (wells)
COLONIA SANTA MARIA is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 32 people from groundwater.
As of August 1, 2026, its federal record holds 7 entries between 1981 and 1983, all of which EPA lists as closed. Nothing has been added since 1983.
Of the 7, 1 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 Miscellaneous Other Rules and the Radionuclides and Revised Rad Rule.
Violation history
Notification, Public
—No contaminant on record
December 1, 1983 – December 31, 1983
ArchivedNotification, Public
—No contaminant on record
November 1, 1983 – November 30, 1983
ArchivedNotification, Public
—No contaminant on record
August 1, 1983 – August 31, 1983
ArchivedNotification, Public
—No contaminant on record
May 1, 1983 – May 31, 1983
ArchivedNotification, Public
—No contaminant on record
April 1, 1983 – April 30, 1983
ArchivedNotification, Public
—No contaminant on record
February 1, 1983 – February 28, 1983
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived
Archived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| December 1, 1983 – December 31, 1983 | Notification, Public | — | — | Archived |
| November 1, 1983 – November 30, 1983 | Notification, Public | — | — | Archived |
| August 1, 1983 – August 31, 1983 | Notification, Public | — | — | Archived |
| May 1, 1983 – May 31, 1983 | Notification, Public | — | — | Archived |
| April 1, 1983 – April 30, 1983 | Notification, Public | — | — | Archived |
| February 1, 1983 – February 28, 1983 | Notification, Public | — | — | Archived |
| October 1, 1981 – September 30, 1982 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Archived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
No enforcement actions on record for this system.
Common questions
Is COLONIA SANTA MARIA required to publish a Consumer Confidence Report?
- Yes. COLONIA SANTA MARIA 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 COLONIA SANTA MARIA’s next Consumer Confidence Report due?
- COLONIA SANTA MARIA’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does COLONIA SANTA MARIA have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for COLONIA SANTA MARIA.
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
ROMERO, AGRIPINA
925-437-7630
BRENTWOOD, CA 94513