Based on EPA UCMR5 monitoring data, EPA SDWIS federal violations records, and EWG Tap Water Database published findings.
Available federal monitoring data indicates this system performs well across most contaminant categories. Low PFAS detection, no documented lead violations, and limited health-based violations place it in the top tier of municipal water quality nationally.
Water source: Surface water (Mokelumne River)
Water utility: East Bay MUD
Not detected in available EPA monitoring data. This is a positive indicator, though PFAS testing coverage is not universal.
The EPA's new maximum contaminant level (MCL) for PFAS is 4 ppt, effective 2026. PFAS compounds have been linked to cancer, thyroid disease, immune disruption, and developmental issues at chronic exposure levels per peer-reviewed research.
The following contaminants have been detected or are associated with elevated risk in this water system, per available EPA and EWG published data:
These detections are drawn from EPA SDWIS federal violations database and EWG Tap Water Database records. EWG health guidelines are stricter than EPA legal limits and reflect long-term exposure risk.
No health-based EPA violations recorded in the past 5 years at this utility. Note: EPA violations reflect legal compliance thresholds, which are less protective than the EWG health guidelines used in HAVEN's scoring model.
A certified pitcher filter (ZeroWater, Clearly Filtered) or under-sink carbon block filter is sufficient for most concerns at this score level. RO filtration provides added peace of mind if PFAS is detected.
Water is one of six categories HAVEN scores. Take the free 3-minute quiz to get your complete Home Health Score — mold, air quality, EMF, household chemicals, and more.
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