Every year Chester Public Utility District tests its drinking water and publishes the results in a Consumer Confidence Report, also called the Water Quality Report. State and federal law require it, so that every customer can see what is in their water and how it compares with drinking water standards.

Current report: 2025 Consumer Confidence Report (PDF). It covers testing from January 1 through December 31, 2025, and was published in March 2026.

Este informe contiene información muy importante sobre su agua potable. Tradúzcalo o hable con alguien que lo entienda bien.

What the report tells you

• Where your water comes from: four District wells (Wells 01B, 02, 03, and 05).
• Every substance that was detected in testing, the amount found, and the legal limit for it.
• Where each substance usually comes from, such as natural minerals in the ground or household plumbing.
• Whether any drinking water standard was exceeded, and what the District did about it.

2025 highlights

• Lead: not detected at the 90th percentile in the most recent round of tap samples (10 homes, 2024). The action level is 15 micrograms per liter.
• Copper: 0.09 milligrams per liter at the 90th percentile, well below the action level of 1.3.
• Nitrate: up to 0.9 milligrams per liter, compared with a legal limit of 10.
• Arsenic: up to 2 micrograms per liter, compared with a legal limit of 10.
• Bacteria: E. coli was not detected. Total coliform bacteria, which occur naturally in the environment, were found during 2025 sampling; the report explains what that means.

How to read the report

• MCL (Maximum Contaminant Level): the highest amount allowed by law.
• PHG (Public Health Goal): the level below which there is no known health risk. It is a goal, not a legal limit.
• AL (Action Level): the amount that, if exceeded, requires the District to take additional steps.
• ND (Not Detected): the substance was not found at the lab’s testing limit.
• mg/L and µg/L: milligrams per liter (parts per million) and micrograms per liter (parts per billion).

Lead and your home plumbing

Lead in drinking water usually comes from household plumbing, not from the water source. If water has been sitting in your pipes for several hours, run the cold tap for 30 seconds to 2 minutes before drinking or cooking with it. To learn more, visit EPA: Lead in Drinking Water or call the Safe Drinking Water Hotline at 1-800-426-4791.

Questions or a paper copy

Call the District office at (530) 258-2171, Monday through Friday, 8:00 a.m. to 4:30 p.m. (closed 12:00 to 1:00 p.m.). We can mail you a paper copy of the report.