RANCHO SANTA MARGARITA, CA · Orange County
RANCHO MISSION VIEJO Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of January 6, 2020. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in Orange County, CA.
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)
- CA3000852
- System type
- Community Water System
- Population served
- 0
- Service connections
- 17
- Ownership
- privately owned
- Water source
- groundwater (wells)
RANCHO MISSION VIEJO formerly served 0 people from groundwater.
EPA's federal records list this system as inactive in 2020; the record below is historical.
As of August 1, 2026, its federal record holds 4 entries between 1981 and 2019, all of which EPA lists as closed. Nothing has been added since 2019.
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, the Groundwater Rule, and the Radionuclides and Revised Rad Rule.
Violation history
Monitoring, Source Water (GWR)
—E. COLI
May 3, 2019 – June 19, 2019
ResolvedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
March 1, 1997 – March 31, 1997
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
February 1, 1997 – February 28, 1997
ResolvedMonitoring, 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 3, 2019 – June 19, 2019 | Monitoring, Source Water (GWR) | E. COLI | — | Resolved |
| March 1, 1997 – March 31, 1997 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Resolved |
| February 1, 1997 – February 28, 1997 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | 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 19, 2019State Compliance achieved9 linked violations
- February 28, 1997State Compliance achieved8 linked violations
Last known contact on file (system is inactive)
PETERSON, DANIEL
949-459-6594
RANCHO SANTA MARGARITA, CA 92688