HOLLISTER, CA · San Benito County
UNION HEIGHTS MWC Water System
Consumer Confidence Report status
UNION HEIGHTS MWC 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 UNION HEIGHTS MWC.
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)
- CA3500825
- System type
- Community Water System
- Population served
- 98
- Service connections
- 29
- Ownership
- privately owned
- Water source
- groundwater (wells)
UNION HEIGHTS MWC is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 98 people from groundwater.
As of August 1, 2026, its federal record holds 4 entries between 2002 and 2009, all of which EPA lists as closed. Nothing has been added since 2009.
Of the 4, 3 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 inorganic chemicals.
Violation history
Monitoring, Regular
—Nitrite
January 1, 2009 – December 31, 2009
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
May 1, 2007 – May 31, 2007
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
June 1, 2002 – June 30, 2002
ResolvedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
May 1, 2002 – May 31, 2002
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| January 1, 2009 – December 31, 2009 | Monitoring, Regular | Nitrite | — | Resolved |
| May 1, 2007 – May 31, 2007 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Resolved |
| June 1, 2002 – June 30, 2002 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Resolved |
| May 1, 2002 – May 31, 2002 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- October 9, 2010State Compliance achieved5 linked violations
- August 13, 2001State Compliance achieved3 linked violations
Common questions
Is UNION HEIGHTS MWC required to publish a Consumer Confidence Report?
- Yes. UNION HEIGHTS MWC 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 UNION HEIGHTS MWC’s next Consumer Confidence Report due?
- UNION HEIGHTS MWC’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does UNION HEIGHTS MWC have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for UNION HEIGHTS MWC.
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
ASH, JOHN
408-592-7884
HOLLISTER, CA 95023