Serving roughly 200,232 people in Ventura County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for OXNARD WATER DEPT
1 water provider directly on file, serving roughly 200,232 people in Ventura County, California.
Quick answer: OXNARD WATER DEPT has no violations on file. One reading is worth knowing about: Aggressive Index was measured at 13AGGR, 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
Lithium
Aggressive Index
Langelier Index (Source Temp.)
Langelier Index (pH(s))
TDS
Sulfate
Magnesium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
Utility OXNARD WATER DEPTPopulation served 200,232Owner 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)
12/31/2027
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 360 MG/L (ppm)
10/15/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 41 MG/L (ppm)
10/15/2025
Calcium
Detected: 110 MG/L (ppm)
10/15/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 1 LANG
9/24/2025
Hardness, Total (ASCACO3)
Detected: 450 MG/L (ppm)
10/15/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 29 µg/L (ppb)
12/6/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 180 MG/L (ppm)
10/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 13 AGGR
10/15/2025
Langelier Index (Source Temp.)
Detected: -0.56 LANG
10/15/2025
TDS
Detected: 860 MG/L (ppm)
10/15/2025
Alkalinity, Total
Detected: 170 MG/L (ppm)
10/15/2025
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.