Here is what the EPA's own data shows about tap water in Mi Wuk Village. According to EPA SDWIS data retrieved July 2026, Mi Wuk Village is served by 4 active community water systems, together reported to serve about 3,030 people.
As of July 2026, EPA records show 14 violations across the community water system(s) serving Mi Wuk Village, going back to the earliest EPA record. 5 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.
Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2025. All have since returned to compliance, per EPA records.
Monitoring Nitrate: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times in January 2022. All have since returned to compliance, per EPA records.
Mi Wuk Heights Mwc
445 served · groundwater · PWSID CA5500060
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.
Sierra Park Water Company Inc.
400 served · groundwater · PWSID CA5510016
Health-based Iron: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times in April 2023. The EPA record lists a level of 0.735 MG/L; the limit (MCL) is 0.3 MG/L. EPA records do not show all of these as returned to compliance.
Health-based Manganese: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times in April 2023. The EPA record lists a level of 0.258 MG/L; the limit (MCL) is 0.05 MG/L. EPA records do not show all of these as returned to compliance.
Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2025. 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 once in January 2006. All have since returned to compliance, per EPA records.
Sierra Village Mobile Home Park
22 served · groundwater · PWSID CA5500353
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 Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2025. All have since returned to compliance, per EPA records.
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.
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.