CITY OF THOUSAND OAKS WATER DEPARTMENT Water Quality Report
Serving roughly 53,157 people in Ventura County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF THOUSAND OAKS WATER DEPARTMENT
1 water provider directly on file, serving roughly 53,157 people in Ventura County, California.
Quick answer: CITY OF THOUSAND OAKS WATER DEPARTMENT has no violations on file. One reading is worth knowing about: Copper Summary was measured at 287mg/L, among the highest of the 179 providers on file in this area. It's the most notable figure in this system's record among its 179 local peers.
Lead Summary
Copper Summary
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Dibromoaceticacid
Copper, Free
Utility CITY OF THOUSAND OAKS WATER DEPARTMENTPopulation served 53,157Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Copper Summary
Detected: 287 mg/L (ppm)
12/31/1998
Copper, Free
Detected: 150 UG/L (ppb)
8/27/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 14 UG/L (ppb)
9/16/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Chloroform
Detected: 1.6 UG/L (ppb)
9/16/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 4.4 UG/L (ppb)
9/16/2025
Bromodichloromethane
Detected: 2.8 UG/L (ppb)
9/16/2025
Dibromochloromethane
Detected: 5.3 UG/L (ppb)
9/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1.5 UG/L (ppb)
9/16/2025
Dibromoaceticacid
Detected: 2.1 UG/L (ppb)
9/16/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.