Does Rancho Santa Margarita, CA tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 8 violation(s) across the community water systems serving Rancho Santa Margarita, of which 0 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Rancho Santa Margarita, CA tap water come from?

Rancho Santa Margarita is served by 2 active community water system(s). Their primary sources, per EPA records, are: surface water.

CA / Rancho Santa Margarita

CA · Tap water records

Rancho Santa Margarita tap water, in plain English

Here is what the EPA's own data shows about tap water in Rancho Santa Margarita. According to EPA SDWIS data retrieved June 2026, Rancho Santa Margarita is served by 2 active community water systems, together reported to serve about 207,973 people.

As of June 2026, EPA records show 8 violations across the community water system(s) serving Rancho Santa Margarita, going back to the earliest EPA record. None were health-based; the records are monitoring or reporting violations (a required test or report was late or missed). Each is listed by system below, with its status.

2

Community water systems
~207,973

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Santa Margarita Water District

168,289 served · surface water · PWSID CA3010101

As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Santa Margarita Water District-Id9

39,684 served · surface water · PWSID CA3010030

Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times in October 2022. All have since returned to compliance, per EPA records.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in October 2020. All have since returned to compliance, per EPA records.

What this means

A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.

This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.

Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.