State Database Flags 2026 Nitrate Limit Violation in Tooleville Drinking-Water System

TOOLEVILLE, California — California’s public drinking-water enforcement database lists a nitrate maximum-contaminant-level violation for the Tooleville Mutual Non Profit Water Association in 2026. The violation detail identifies the water system as CA5400567, records a reported result of 11 milligrams per liter, and associates the violation with the July–September 2026 compliance period. The state record lists an August 25 determination date.

What the official finding does and does not establish

The California State Water Resources Control Board labels this entry an “MCL, average” violation, which means the state classified the result under its drinking-water compliance rules. This is a published enforcement record, not a fresh sample taken at each customer’s tap today. Water-system conditions, follow-up tests and any public notices must be checked separately with the operator and the state’s Division of Drinking Water.

Nitrate in drinking water is particularly concerning for infants. State guidance warns that boiling does not remove nitrate and can actually raise its concentration as water evaporates. Families making infant formula and anyone who has received a drinking-water warning should follow the current instructions from the water supplier or public-health authority and use an appropriate alternative source where advised.

How residents can check what applies to them

Ask the supplier for the latest consumer confidence report, current nitrate test results, any required public notices and available alternative-water arrangements. Verify whether your address is supplied by the Tooleville water association; a shared community name does not prove a property has the same water source. For questions about the official violation record, contact California’s Division of Drinking Water through the agency’s public contact information.

The record must not be misread as proof of an active boil-water notice: boiling is not the recommended remedy for nitrate contamination. Nor does a past violation alone establish that a permanent corrective project has already been completed.

Primary sources: State Drinking Water Watch — Tooleville nitrate violation 2026-9700014; State Water Board — Nitrate information; U.S. EPA — Why boiling does not remove nitrate.

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