Colusa Southern System
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.
CA / Colusa
CA · Tap water records
Colusa tap water, in plain English
Here is what the EPA's own data shows about tap water in Colusa. According to EPA SDWIS data retrieved June 2026, Colusa is served by 2 active community water systems, together reported to serve about 3,541 people.
As of June 2026, EPA records show no reported violations for the community water system(s) serving Colusa. This means none of the federal drinking-water standards tracked in the EPA's SDWIS database were recorded as exceeded in the period covered. It is not a guarantee about every substance, or about the water inside your home's own plumbing.
- 2Community water systems
- ~3,541People served (EPA-reported)
- June 2026EPA records reviewed through
What the EPA has on record, by system
Colusa Northern System
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.