Here is what the EPA's own data shows about tap water in Prunedale. According to EPA SDWIS data retrieved July 2026, Prunedale is served by 4 active community water systems, together reported to serve about 225 people.
As of July 2026, EPA records show 23 violations across the community water system(s) serving Prunedale, going back to the earliest EPA record. 21 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.
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 once in October 2017. All have since returned to compliance, per EPA records.
Thimio Mwc
59 served · groundwater · PWSID CA2702608
Health-based Nitrate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 20 times between April 2022 and April 2024. The EPA record lists a level of 11 MG/L; the limit (MCL) is 10 MG/L. EPA records do not show all of these as returned to compliance.
Woodland Heights Mwc
57 served · groundwater · PWSID CA2702439
As of July 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.
Paradise Rd Ws #05
42 served · groundwater · PWSID CA2700678
As of July 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.
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 July 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.