CA / Hughson
CA · Tap water records
Hughson tap water, in plain English
Here is what the EPA's own data shows about tap water in Hughson. According to EPA SDWIS data retrieved June 2026, Hughson is served by 2 active community water systems, together reported to serve about 7,531 people.
As of June 2026, EPA records show 123 violations across the community water system(s) serving Hughson, going back to the earliest EPA record. 121 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
Hughson, City Of
7,481 served · groundwater · PWSID CA5010008 - Health-based Arsenic: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 73 times between January 2016 and July 2025. The EPA record lists a level of 0.011 MG/L; the limit (MCL) is 0.01 MG/L. EPA records do not show all of these as returned to compliance.
- 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.
- Health-based 1,2,3-Trichloropropane: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times between January 2023 and April 2023. The EPA record lists a level of 0.021 UG/L; the limit (MCL) is 0.005 UG/L. 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 2010. All have since returned to compliance, per EPA records.
Cobles Corner
50 served · groundwater · PWSID CA5000033 - Health-based Arsenic: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 44 times between January 2016 and July 2025. The EPA record lists a level of 0.013 MG/L; the limit (MCL) is 0.01 MG/L. EPA records do not show all of these as returned to compliance.
- Health-based Coliform (TCR): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in February 1997. The EPA record for these does not include a measured level. 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.