CA / Mendocino
CA · Tap water records
Mendocino tap water, in plain English
Here is what the EPA's own data shows about tap water in Mendocino. According to EPA SDWIS data retrieved June 2026, Mendocino is served by 6 active community water systems, together reported to serve about 459 people.
As of June 2026, EPA records show 91 violations across the community water system(s) serving Mendocino, going back to the earliest EPA record. 88 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.
What the EPA has on record, by system
Surfwood Mutual Water Corporation
160 served · surface water · PWSID CA2300590 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 54 times between January 2015 and April 2023. The EPA record lists a level of 88 UG/L; the limit (MCL) is 80 UG/L. EPA records do not show all of these as returned to compliance.
- Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 33 times between January 2015 and July 2019. The EPA record lists a level of 68 UG/L; the limit (MCL) is 60 UG/L. EPA records do not show all of these as returned to compliance.
Hills Ranch Mutual Water Company
79 served · groundwater · PWSID CA2300832 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.
Shorelands Road & Water Company
78 served · groundwater · PWSID CA2300545 - 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 June 2011. All have since returned to compliance, per EPA records.
Point Of View Mutual Water Co
56 served · groundwater · PWSID CA2300604 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.
Seafair Road And Water Company
50 served · groundwater · PWSID CA2300609 - Health-based Coliform (TCR): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in November 1999. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring Coliform (TCR): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in March 2005. All have since returned to compliance, per EPA records.
Big River Vista Mutual Water Company
36 served · groundwater · PWSID CA2300596 - Monitoring Coliform (TCR): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in May 1995. 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.