Does Hawthorne, CA tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 8 violation(s) across the community water systems serving Hawthorne, of which 4 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Hawthorne, CA tap water come from?

Hawthorne is served by 5 active community water system(s). Their primary sources, per EPA records, are: surface water, groundwater.

CA / Hawthorne

CA · Tap water records

Hawthorne tap water, in plain English

Here is what the EPA's own data shows about tap water in Hawthorne. According to EPA SDWIS data retrieved June 2026, Hawthorne is served by 5 active community water systems, together reported to serve about 321,206 people.

As of June 2026, EPA records show 8 violations across the community water system(s) serving Hawthorne, going back to the earliest EPA record. 4 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.

5

Community water systems
~321,206

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Gswc - Southwest

277,740 served · surface water · PWSID CA1910155

Monitoring E. COLI: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in November 2014. All have since returned to compliance, per EPA records.

Golden State Water Company - Orcutt

34,102 served · surface water · PWSID CA4210016

Monitoring Nitrate: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in January 2023. All have since returned to compliance, per EPA records.

Golden State Water Company - Los Osos

5,924 served · groundwater · PWSID CA4010017

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.

Golden State Water Company - Tanglewood

1,947 served · surface water · PWSID CA4210021

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.

Golden State Water Company - Edna

1,493 served · groundwater · PWSID CA4010023

Health-based Selenium: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 4 times in February 2003. The EPA record lists a level of 0.067 MG/L; the limit (MCL) is 0.05 MG/L. 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.