Disinfection byproducts · 2026
HAA5 in City of Thousand Oaks Water Department, CA tap water
City of Thousand Oaks Water Department, CA's 2026 Consumer Confidence Report tested for HAA5 and reported no detectable amount.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Distribution | Not detected UG/L | 60 UG/L MCL |
Verbatim from City of Thousand Oaks Water Department, CA's 2026 Consumer Confidence Report — source document ↗
About HAA5
Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.
Long-term exposure above the federal limit is associated with an increased cancer risk.
How City of Thousand Oaks Water Department, CA compares
5 of the 439 systems measuring HAA5 on The Water Map have it at or above the federal limit:
Nearby systems also reporting HAA5:
People also ask
+Is there HAA5 in City of Thousand Oaks Water Department, CA tap water?
City of Thousand Oaks Water Department, CA's 2026 Consumer Confidence Report tested for HAA5 and found no detectable amount.
+What's the federal limit for HAA5 in drinking water?
The federal MCL for HAA5 is 60 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is HAA5?
Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
+Which other U.S. cities have HAA5 over the federal limit?
5 of the 439 systems on The Water Map measuring HAA5 report it at or above the federal limit. Examples include Albuquerque, NM, Columbus, OH, Hollywood, FL.
+Where does this HAA5 measurement come from?
This page reproduces the HAA5 entry from the 2026 Consumer Confidence Report published by the City of Thousand Oaks Water Department, CA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/ca/thousand-oaks-water-department/2026/source.