CA / Walnut Grove
CA · Tap water records
Walnut Grove tap water, in plain English
Here is what the EPA's own data shows about tap water in Walnut Grove. According to EPA SDWIS data retrieved June 2026, Walnut Grove is served by 3 active community water systems, together reported to serve about 253 people.
As of June 2026, EPA records show 65 violations across the community water system(s) serving Walnut Grove, going back to the earliest EPA record. 57 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
Snug Harbor Rv Lp
125 served · groundwater · PWSID CA4800561 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 10 times between April 2021 and January 2023. The EPA record lists a level of 0.1 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
- Health-based Arsenic: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 39 times between July 2011 and January 2017. The EPA record lists a level of 0.011 MG/L; the limit (MCL) is 0.01 MG/L. 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 2014. All have since returned to compliance, per EPA records.
Locke Water Works Co [Sws]
80 served · groundwater · PWSID CA3400138 - Health-based Arsenic: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 8 times between January 2016 and January 2021. The EPA record lists a level of 0.0297 MG/L; the limit (MCL) is 0.01 MG/L. 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 3 times between July 1993 and October 2024. EPA records do not show all of these as returned to compliance.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between July 2009 and July 2015. All have since returned to compliance, per EPA records.
Tunnel Trailer Park
48 served · groundwater · PWSID CA3400192 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.
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.