Does Fremont, CA tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 18 violation(s) across the community water systems serving Fremont, of which 1 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Fremont, CA tap water come from?

Fremont is served by 3 active community water system(s). Their primary sources, per EPA records, are: surface water, groundwater.

CA / Fremont

CA · Tap water records

Fremont tap water, in plain English

Here is what the EPA's own data shows about tap water in Fremont. According to EPA SDWIS data retrieved June 2026, Fremont is served by 3 active community water systems, together reported to serve about 344,145 people.

As of June 2026, EPA records show 18 violations across the community water system(s) serving Fremont, going back to the earliest EPA record. 1 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.

3

Community water systems
~344,145

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Alameda County Water District

344,000 served · surface water · PWSID CA0110001

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.

Marina Mobile Manor

75 served · groundwater · PWSID CA0707608

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.

Hidden Harbor Marina & Rvp

70 served · groundwater · PWSID CA5200526

Health-based LEAD AND COPPER RULE REVISIONS: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in October 2024. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
Monitoring LEAD AND COPPER RULE REVISIONS: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2024. EPA records do not show all of these as returned to compliance.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 16 times between July 2021 and July 2024. EPA records do not show all of these as returned to compliance.

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.